Aon (AON)

Company ID: 97 | CIK: 0000315293
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Segments are charted by their disclosed metrics (revenue, segment profit, etc.). Each line is a single segment. Reconciliation/corporate items are excluded. Major customers are shown as a percentage of revenue. Operational KPIs are grouped by metric concept; sub-metrics appear as separate lines.

Geographic Segments

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Business Unit / Product Segments

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Major Customers (% of Revenue)

Operational KPIs

Sales Agents (advisors)

Total investments (aum)

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AAU Program liability balance (backlog)

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Offices (branches)

International Career Agents (contractors)

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Common stockholders (customers)

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Employees notified of termination (headcount)

Securitized installment loans outstanding (loans_outstanding)

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2005 plan cost savings (other)

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2005 plan eliminations completed (other)

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2005 plan job eliminations (other)

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2007 plan cost savings (other)

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2007 plan job eliminations (other)

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2007 plan restructuring charges (other)

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AAU Program costs (other)

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AAU Program costs from inception (other)

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AAU Program costs incurred (other)

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AAU Program cumulative costs (other)

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AAU Program expected annualized savings (other)

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AAU Program liability (other)

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AAU Program liability balance (other)

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AAU cumulative expense savings (other)

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AAU expected annual savings (other)

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Accelerating Aon United Program charges (other)

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Accelerating Aon United Program cost (other)

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Accelerating Aon United Program costs (other)

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Accelerating Aon United Program expected cost (other)

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Accelerating Aon United Program liability (other)

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Accelerating Aon United Program savings (other)

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Accumulated deficit (other)

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Accumulated other comprehensive loss (other)

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Acquisitions completed (other)

Additional paid-in capital (other)

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Adjusted Diluted EPS (other)

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Adjusted pretax margin (other)

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Amortization of intangible assets (other)

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Annualized cost savings (other)

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Annualized cost savings target (other)

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Annualized restructuring savings (other)

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Apprentices hired (other)

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Assets held for sale (other)

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Auto credit underwriting revenue (other)

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Available credit facilities (other)

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Available credit under committed facilities (other)

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Average common shares outstanding (other)

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Average repurchase price (other)

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Average repurchase price per share (other)

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Bank SPE advances (other)

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Below investment grade fixed maturities (other)

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Below-investment-grade amortized cost (other)

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Below-investment-grade fair value (other)

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Book value per share (other)

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Brokerage organic revenue growth (other)

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Business acquisitions completed (other)

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Business dispositions completed (other)

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Business transformation special charges (other)

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Business unit Year 2000 plans (other)

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Business unit Year 2000 plans tracked (other)

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Business units on watch list (other)

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Business units remediated (other)

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Businesses acquired (other)

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CEO pay ratio (other)

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CICA revenue (other)

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CMO portfolio (other)

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Capital expenditures (other)

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Captive insurance entities managed (other)

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Career insurance agents (other)

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Carrier Year 2000 response rate (other)

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Carriers contacted for Year 2000 compliance (other)

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Cash Dividends Per Share (other)

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Cash and cash equivalents (other)

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Cash and investments (other)

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Cash and short-term investments (other)

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Cash flow from operations (other)

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Cash from operating activities (other)

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Cash provided by operating activities (other)

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Class A Ordinary Shares outstanding (other)

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Class A ordinary shares outstanding (other)

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Closing stock price (other)

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Commercial Risk Solutions organic revenue growth (other)

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Commercial paper outstanding (other)

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Commercial paper rate (other)

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Committed credit facilities (other)

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Committed credit facilities available (other)

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Common shares outstanding (other)

Common shares repurchased (other)

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Common stock outstanding (other)

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Common stockholders (other)

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Common stockholders of record (other)

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Consulting offices (other)

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Consulting organic revenue growth (other)

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Contingent commissions (other)

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Contingent commissions earned (other)

Contingent commissions revenue (other)

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Contingent premium guarantees (other)

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Contractual contingent guarantees exposure (other)

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Core brokerage revenue growth (other)

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Cost savings (other)

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Cost savings realized (other)

Countries (other)

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Countries and sovereignties (other)

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Countries of Operation (other)

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Countries of operation (other)

Countries served (other)

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Countries with offices (other)

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CoverWallet premium volume (other)

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Credit facility commitment (other)

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Cumulative annualized savings realized (other)

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Cumulative run-rate cost savings (other)

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Cumulative share repurchases (other)

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Daily service calls (other)

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Data & Analytic Services organic revenue growth (other)

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Debt and preferred to total capital (other)

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Derivative collateral (other)

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Diluted EPS (other)

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Endurance common stock investment (other)

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Endurance warrants (other)

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Equity investment stake (other)

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Equity positions (other)

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Equity securities fair value (other)

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Estimated annualized pre-tax savings (other)

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Estimated restructuring charges (other)

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Estimated role eliminations (other)

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Estimated total restructuring cost (other)

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Expected annual restructuring savings (other)

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Expected pension contributions (other)

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FX exposure hedged (other)

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FX hedge coverage (other)

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Fair value to amortized cost (other)

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Fair value to amortized cost ratio (other)

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Fiduciary assets (other)

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Fiduciary assets held (other)

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Fiduciary assets held on behalf of clients (other)

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Fiduciary cash and investments (other)

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Fiduciary investment income (other)

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Fixed maturities fair value ratio (other)

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Fixed maturities fair value to amortized cost (other)

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Fixed maturities investment grade (other)

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Fixed maturities market value ratio (other)

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Fixed maturity fair value ratio (other)

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Fixed maturity fair value to amortized cost (other)

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Fixed maturity investments fair value (other)

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Fixed maturity portfolio (other)

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Foreign exchange hedge coverage (other)

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Foreign exchange hedged (other)

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Foreign exchange impact on revenue (other)

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Free Cash Flow (other)

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Free cash flow (other)

Funds held for clients (other)

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Global distribution countries (other)

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Goodwill (other)

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Health Solutions organic revenue growth (other)

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Hedged Euro exposure (other)

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Hedged USD exposure (other)

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Holders of record (other)

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Insurance carrier response rate (other)

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Insurance carriers contacted (other)

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Insurance carriers surveyed (other)

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Insurance entities managed (other)

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Insurance products and programs (other)

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Insurance products and programs offered (other)

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Intangible assets, net (other)

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Investment grade allocation (other)

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Investment grade holdings (other)

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Investment grade holdings percentage (other)

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Investment portfolio mix (other)

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Investment reserves (other)

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Investment reserves - mortgage loan losses (other)

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Job eliminations (other)

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Jobs eliminated under restructuring (other)

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Letters of credit outstanding (other)

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Liabilities held for sale (other)

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Life insurance in force (other)

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Liquid investment portfolio share (other)

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Long-term debt (other)

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MA products share of CICA revenue (other)

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Market value to amortized cost (other)

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Median employee compensation (other)

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Mortgage loans (other)

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Mortgage loans held (other)

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Mortgage loans percentage (other)

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Mortgage loans share of invested assets (other)

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Mortgage-backed securities (other)

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NFP revenue contribution (other)

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Net restructuring savings (other)

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Net unrealized gains on derivatives (other)

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Non-U.S. revenue share (other)

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Non-income producing investments (other)

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Non-income producing investments percentage (other)

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Non-income producing investments share (other)

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Non-vested restricted share units (other)

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Non-vested stock awards (other)

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Noncontrolling interests (other)

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Number of Reportable Segments (other)

Offices (other)

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Operating margin (other)

Ordinary shares outstanding (other)

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Organic Revenue Growth (other)

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Organic revenue growth (other)

Other compensation for services to underwriters (other)

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Other compensation from underwriters (other)

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Outstanding share options (other)

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Over-collateralization (other)

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PEPS I unfunded commitments (other)

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Pension and OPEB contributions (other)

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Pension contributions (other)

Pension plan contributions (other)

Planned workforce reductions (other)

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Policies issued (other)

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Policy and contract claim liabilities (other)

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Positions eliminated (other)

Positions eliminated under restructuring (other)

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Positions planned for elimination (other)

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Positions to be eliminated (other)

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Positions with unrealized losses (other)

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Potential performance RSUs (other)

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Preferred shares outstanding (other)

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Preferred shares retired (other)

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Preferred stock shares outstanding (other)

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Premium finance advances (other)

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Premium finance advances outstanding (other)

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Premium finance arranged (other)

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Premium finance conduit commitment (other)

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Premium finance portfolio sold (other)

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Premium finance sold portfolio (other)

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Premium guarantee exposure (other)

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Premium payment guarantee exposure (other)

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Premium payment guarantees (other)

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Premium payment guarantees exposure (other)

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Premium trust balances (other)

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Pretax margin (other)

Program costs incurred (other)

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Program expected annualized savings (other)

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Program expected cumulative costs (other)

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Ratio of earnings to fixed charges (other)

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Ratio of earnings to fixed charges and preferred dividends (other)

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Reasonably possible legal loss range (other)

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Reinsurance Solutions organic revenue growth (other)

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Reinsurance guarantee (other)

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Reinsurance recoverables (other)

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Reinsurance recoverables guaranteed (other)

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Remaining authorized share repurchase (other)

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Remaining repurchase authorization (other)

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Reported operating margin (other)

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Repurchase authorization remaining (other)

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Restructuring charges (other)

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Restructuring charges incurred (other)

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Restructuring cost savings (other)

Restructuring cost savings realized (other)

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Restructuring expenses (other)

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Restructuring job reductions (other)

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Restructuring role eliminations (other)

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Restructuring savings realized (other)

Restructuring savings target (other)

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Retail automobile dealers (other)

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Retained interest in sold receivables (other)

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Retirement Solutions organic revenue growth (other)

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Service calls (other)

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Share price (other)

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Share repurchase authorization remaining (other)

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Share repurchase cost (other)

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Share repurchases (other)

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Share-based compensation expense (other)

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Shares Outstanding (other)

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Shares Repurchased (other)

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Shares outstanding (other)

Shares repurchased (other)

Shares repurchased since inception (other)

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Short-term and fixed maturity share of investments (other)

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Short-term debt (other)

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Short-term investments (other)

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Sterling share of CICA revenue (other)

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Stock compensation expense (other)

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Stock options exercisable (other)

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Stock options outstanding (other)

Stockholders equity per share (other)

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Stockholders' equity (other)

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Stockholders' equity per share (other)

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Target annualized expense savings (other)

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Targeted cost savings (other)

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Total Aon shareholders' deficit (other)

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Total assets (other)

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Total costs incurred from inception to date (other)

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Total debt (other)

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Total debt outstanding (other)

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Total debt-to-EBITDA ratio (other)

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Total deficit (other)

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Total equity (other)

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Total investments (other)

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Treasury shares (other)

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Treasury shares held (other)

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Treasury stock (other)

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Treasury stock shares (other)

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U.K. hedged transaction exposure (other)

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U.S. carrier response rate (other)

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U.S. workforce racial/ethnic diversity (other)

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UK transaction exposure hedged (other)

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Unamortized deferred compensation (other)

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Unamortized deferred compensation expense (other)

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Unbilled receivables (other)

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Unfunded LP commitments (other)

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Unfunded PEPS I commitments (other)

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Unfunded commitments (other)

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Unfunded pension commitments (other)

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Unicover-related revenue (other)

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Unrealized gains on derivatives (other)

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Unrecognized tax benefits (other)

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Value of $100 investment (other)

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Weighted average commercial paper interest rate (other)

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Weighted average commercial paper outstanding (other)

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Weighted average diluted shares (other)

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Weighted average shares (other)

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Women in workforce (other)

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Workforce gender diversity (other)

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Workforce reduction target (other)

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Year 2000 carrier questionnaire response rate (other)

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Year 2000 costs incurred (other)

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Year 2000 costs projected (other)

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Year 2000 costs remaining (other)

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Year 2000 remediation costs (other)

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Year 2000 remediation costs projected (other)

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Year 2000 remediation costs remaining (other)

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Year 2000 total projected costs (other)

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us-gaap:NumberOfReportableSegments (other)

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Policies issued (policies_in_force)

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Premium volume (premiums_written)

Office square footage (square_footage)

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Human capital disclosures. Workforce totals and demographics are point-in-time. Flow metrics use the year-to-date period for 10-Q and full year for 10-K. Workforce actions (RIFs, restructurings, acquisition-related changes) are listed in the table at the bottom.

Workforce Totals

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Demographics

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Workforce Breakdowns

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HCM Metrics — Point-in-Time

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HCM Metrics — Flow (Annual / YTD)

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Workforce Actions

Period EndTypeStatusAffected% WorkforceAnnouncedExpected CompletionGeographySegment / FunctionChargeSourceNote
2026-06-30restructuringin_progress2023GlobalEnterprise (Risk Capital, Human Capital, and Corporate)USD 188 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three-year program initiated Q3 2023 covering technology, workforce optimization, and asset impairments. No employee counts disclosed. Charges: $96M in Q2 2026, $188M YTD 2026; $1,077M incurred inception-to-date; expected cumulative cost $1.3B (~$1.2B cash). Expected lifetime charges by segment: Risk Capital ~$290M, Human Capital ~$70M, remainder Corporate. Liability balance $169M at 2026-06-30; program in final quarters with ~$450M annualized savings targeted by end of 2027.
2026-06-30acquisition_additioncompletedGlobalRisk Capital (6) and Human Capital (2)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Eight acquisitions completed in the six months ended 2026-06-30 (3 in Q2 2026), aggregate consideration $431M including $376M cash; goodwill of $212M. No headcount added disclosed. Significant 2026 acquisition: ShoreOne Insurance Managers, Inc. (closed 2026-03-16, U.S. coastal homeowners/flood broker, Risk Capital).
2026-06-30restructuringin_progress2023-07-01GlobalCorporate, Risk Capital, Human CapitalUSD 96 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Three-year program initiated in Q3 2023. Q2 2026 charges include technology, workforce optimization, and asset impairments. Employee count not disclosed.
2026-06-30acquisition_additioncompleted2026-03-162026-03-16United StatesRisk Capitalbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of ShoreOne Insurance Managers, Inc. completed March 16, 2026. Headcount added not disclosed.
2026-06-30restructuringin_progressUSD 96,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-06-30restructuringin_progressAccelerating Aon United Program [Member]USD 96,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-06-30restructuringin_progressOperating Segments [Member] / Risk Capital Segment [Member] / Accelerating Aon United Program [Member]USD 14,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-06-30restructuringin_progressOperating Segments [Member] / Human Capital Segment [Member] / Accelerating Aon United Program [Member]USD -1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-06-30restructuringin_progressSegment Reporting, Reconciling Item, Corporate Nonsegment [Member] / Accelerating Aon United Program [Member]USD 83,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-06-30restructuringin_progressTechnology And Other [Member] / Accelerating Aon United Program [Member]USD 124,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-06-30restructuringin_progressWorkforce Optimization [Member] / Accelerating Aon United Program [Member]USD 61,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-06-30restructuringin_progressAsset Impairments [Member] / Accelerating Aon United Program [Member]USD 3,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-03-31restructuringin_progress2023-07-01GlobalRisk Capital; Human Capital; CorporateUSD 92 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three-year program initiated Q3 2023; Q1 2026 charges of $92M (Risk Capital $19M, Human Capital $5M, Corporate $68M). Cumulative costs $981M; expected total ~$1.3B. No employee-affected counts disclosed.
2026-03-31acquisition_additioncompleted2026-03-162026-03-16United StatesRisk Capitalbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of ShoreOne Insurance Managers, Inc. (coastal homeowners/flood broker). Headcount added not disclosed; aggregate consideration $397M across 5 Q1 2026 acquisitions.
2026-03-31restructuringin_progress2023-07-012026-12-31GlobalCorporate, Risk Capital, Human CapitalUSD 92 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Three-year restructuring program initiated in Q3 2023. Q1 2026 charges of $92M include $62M technology/other, $29M workforce optimization, and $1M asset impairments. Cumulative costs expected to be $1.3B. Employee count affected not disclosed in this period.
2026-03-31restructuringin_progressUSD 92,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-03-31restructuringin_progressAccelerating Aon United Program [Member]USD 92,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-03-31restructuringin_progressOperating Segments [Member] / Risk Capital Segment [Member] / Accelerating Aon United Program [Member]USD 19,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-03-31restructuringin_progressOperating Segments [Member] / Human Capital Segment [Member] / Accelerating Aon United Program [Member]USD 5,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-03-31restructuringin_progressSegment Reporting, Reconciling Item, Corporate Nonsegment [Member] / Accelerating Aon United Program [Member]USD 68,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-03-31restructuringin_progressTechnology And Other [Member] / Accelerating Aon United Program [Member]USD 62,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-03-31restructuringin_progressWorkforce Optimization [Member] / Accelerating Aon United Program [Member]USD 29,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2026-03-31restructuringin_progressAsset Impairments [Member] / Accelerating Aon United Program [Member]USD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-12-31restructuringin_progress2023-07-012027-12-31GlobalRisk CapitalUSD 82 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		FY2025 charge of $82M for Risk Capital; program announced in Q3 2023 (announcement date approximate). Expected lifetime Risk Capital charges approximately $300M. Program-wide FY2025 charges $365M, cumulative inception-to-date $889M, expected total approximately $1.3B ($1.2B cash, $0.1B non-cash), with approximately $450M annualized savings by end of 2027. Employees affected not disclosed.
2025-12-31restructuringin_progress2023-07-012027-12-31GlobalHuman CapitalUSD 16 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		FY2025 charge of $16M for Human Capital; expected lifetime Human Capital charges approximately $80M. Remaining program charges relate to corporate expenses. Employees affected not disclosed.
2025-12-31restructuringin_progress2023-07-012027-12-31GlobalCorporateUSD 267 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		FY2025 charge of $267M for Corporate; includes technology rationalization, workforce optimization and asset impairments (including real estate consolidation). Unpaid program liability of $147M at December 31, 2025. Employees affected not disclosed.
2025-12-31divestiture_reductioncompleted2025-10-30Human Capital — Wealth Solutionsother
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of a significant majority of NFP's wealth businesses (Wealthspire Advisors, Fiducient Advisors, Newport Private Wealth) to Madison Dearborn Partners completed October 30, 2025; cash proceeds $2.3B and pre-tax gain of $1.2B. One of four dispositions completed in 2025 (1 Risk Capital, 3 Human Capital). Headcount removed not disclosed.
2025-12-31divestiture_reductioncompleted2025-07-31Cyber security and digital forensicsother
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of Aon's Stroz Friedberg, Inc. and Elysium Digital, LLC businesses triggered a partial termination of deferred compensation and supplemental savings plans effective July 31, 2025 for affected participants, with vested balances distributed no later than March 15, 2026. Headcount removed not disclosed.
2025-12-31acquisition_additioncompleted2025-12-31Risk Capital (10) and Human Capital (8)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		18 acquisitions completed during 2025 with aggregate consideration transferred of $981M (cash $915M, deferred and contingent consideration $66M). Largest named transaction is Griffiths & Armour, a UK insurance broker, closed January 1, 2025 for approximately $426M. Revenue from 2025 acquisitions included in the income statement was approximately $101M. Headcount added not disclosed.
2025-12-31restructuringin_progress2023-07-012027-12-31GlobalCorporate, Risk Capital, Human CapitalUSD 365 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Program initiated in Q3 2023. Total expected cumulative costs increased to $1.3 billion in Q4 2025. Charges in 2025 were $365 million. Expected annualized savings of $450 million by end of 2027. Employee count affected not explicitly disclosed for the current year.
2025-12-31restructuringin_progressUSD 365,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2025-12-31restructuringin_progressOperating Segments [Member] / Risk Capital Segment [Member] / Accelerating Aon United Program [Member]USD 82,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2025-12-31restructuringin_progressOperating Segments [Member] / Human Capital Segment [Member] / Accelerating Aon United Program [Member]USD 16,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2025-12-31restructuringin_progressSegment Reporting, Reconciling Item, Corporate Nonsegment [Member] / Accelerating Aon United Program [Member]USD 267,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2025-12-31restructuringin_progressAccelerating Aon United Program [Member]USD 365,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2025-12-31restructuringin_progressWorkforce Optimization [Member] / Accelerating Aon United Program [Member]USD 195,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2025-12-31restructuringin_progressTechnology And Other [Member] / Accelerating Aon United Program [Member]USD 155,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2025-12-31restructuringin_progressAsset Impairments [Member] / Accelerating Aon United Program [Member]USD 15,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2025-09-30restructuringin_progress2023-07-012026-12-31GlobalRisk Capital; Human Capital; CorporateUSD 236 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three-year program initiated Q3 2023; $32M charged in Q3 2025 and $236M YTD 2025. Cumulative costs $760M to date against expected $1.0B total; $90M liability remaining at 2025-09-30. No employee counts disclosed; charges cover technology, workforce optimization, and asset impairments.
2025-09-30divestiture_reductioncompleted2025-09-032025-10-30United StatesHuman Capital — Wealth Solutionssubsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale of significant portion of NFP wealth businesses (Wealthspire, Fiducient, Newport) to Madison Dearborn; $1.3B assets classified held for sale at quarter-end; closed 2025-10-30 with $2.3B proceeds. No headcount impact disclosed.
2025-09-30acquisition_additioncompleted2025-01-012025-01-01United KingdomRisk CapitalUSD 418 (millions)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Griffiths & Armour insurance broker for ~$418M purchase price; no headcount disclosed. 14 acquisitions completed in first nine months of 2025 (8 Risk Capital, 6 Human Capital) with aggregate consideration of $831M; no employee counts disclosed for any.
2025-09-30restructuringin_progress2023-07-01GlobalCorporate, Risk Capital, Human CapitalUSD 32 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Q3 2025 charges of $32M for the Accelerating Aon United Program, initiated in Q3 2023. Includes technology, workforce optimization, and asset impairments. Employee count not disclosed.
2025-09-30restructuringin_progress2023-07-01GlobalCorporate, Risk Capital, Human CapitalUSD 236 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		YTD 2025 charges of $236M for the Accelerating Aon United Program. Employee count not disclosed.
2025-09-30restructuringin_progressUSD 32,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-09-30restructuringin_progressAccelerating Aon United Program [Member]USD 32,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-09-30restructuringin_progressOperating Segments [Member] / Risk Capital Segment [Member] / Accelerating Aon United Program [Member]USD -3,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-09-30restructuringin_progressOperating Segments [Member] / Human Capital Segment [Member] / Accelerating Aon United Program [Member]USD -1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-09-30restructuringin_progressSegment Reporting, Reconciling Item, Corporate Nonsegment [Member] / Accelerating Aon United Program [Member]USD 36,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-09-30restructuringin_progressTechnology And Other [Member] / Accelerating Aon United Program [Member]USD 138,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-09-30restructuringin_progressWorkforce Optimization [Member] / Accelerating Aon United Program [Member]USD 91,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-09-30restructuringin_progressAsset Impairments [Member] / Accelerating Aon United Program [Member]USD 7,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-06-30restructuringin_progress2023-07-012026-12-31GlobalRisk Capital; Human Capital; CorporateUSD 94 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three-year program initiated Q3 2023; Q2 2025 charges $94M (YTD $204M). Cumulative costs to date $728M against $1.0B expected total. No employee-affected count disclosed. Program targets ~$350M annualized savings by end of 2026.
2025-06-30acquisition_additioncompleted2025-01-012025-01-01United KingdomRisk Capitalbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Griffiths & Armour insurance broker completed 2025-01-01; no headcount added disclosed.
2025-06-30acquisition_additioncompleted2024-04-252024-04-25United StatesRisk Capital; Human Capitalbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		NFP Transaction measurement period adjustments finalized in Q2 2025; no headcount added disclosed.
2025-06-30restructuringin_progress2023-07-012026-12-31GlobalCorporate, Risk Capital, Human CapitalUSD 94 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Three-year program initiated in Q3 2023. Q2 2025 charges of $94M include technology, workforce optimization, and asset impairments. Cumulative expected costs $1.0B. Employee count not disclosed.
2025-06-30acquisition_additioncompleted2025-01-012025-01-01United KingdomRisk Capitalbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of Griffiths & Armour completed Jan 1, 2025. Headcount not disclosed.
2025-06-30acquisition_additioncompleted2024-04-252024-04-25GlobalRisk Capital, Human Capitalbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		NFP Transaction completed April 25, 2024. Headcount not disclosed in this 10-Q.
2025-06-30restructuringin_progressUSD 94,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-06-30restructuringin_progressAccelerating Aon United Program [Member]USD 94,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-06-30restructuringin_progressOperating Segments [Member] / Risk Capital Segment [Member] / Accelerating Aon United Program [Member]USD 32,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-06-30restructuringin_progressOperating Segments [Member] / Human Capital Segment [Member] / Accelerating Aon United Program [Member]USD 6,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-06-30restructuringin_progressSegment Reporting, Reconciling Item, Corporate Nonsegment [Member] / Accelerating Aon United Program [Member]USD 56,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-06-30restructuringin_progressTechnology And Other [Member] / Accelerating Aon United Program [Member]USD 100,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-06-30restructuringin_progressWorkforce Optimization [Member] / Accelerating Aon United Program [Member]USD 100,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-06-30restructuringin_progressAsset Impairments [Member] / Accelerating Aon United Program [Member]USD 4,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-03-31restructuringin_progress2023GlobalEnterprise-wide (Risk Capital, Human Capital, Corporate)USD 110 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three-year program initiated Q3 2023 including a workforce optimization component (headcount reduction and separation costs); no employee counts disclosed. Q1 2025 charges of $110M split Risk Capital $19M, Human Capital $4M, Corporate $87M; cumulative program cost expected ~$1.0B (~$0.9B cash), with ~$350M annualized savings targeted by end of 2026. Program liability balance $108M at 2025-03-31.
2025-03-31acquisition_additioncompleted2025-01-01United Kingdom (Griffiths & Armour) and other undisclosed locationsRisk Capital (6 acquisitions) and Human Capital (1 acquisition)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Seven acquisitions completed in Q1 2025, including Griffiths & Armour (UK broker) closing 2025-01-01; aggregate consideration $640M. Headcount added through these acquisitions is not disclosed.
2025-03-31restructuringin_progress2023-07-012026-12-31GlobalCorporate, Risk Capital, Human CapitalUSD 110 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Program initiated in Q3 2023. Q1 2025 charges of $110M include $56M technology/other, $51M workforce optimization, and $3M asset impairments. Cumulative expected costs $1.0B. Employee count not disclosed for current quarter actions.
2025-03-31acquisition_additioncompleted2025-01-012025-01-01United KingdomRisk Capitalbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of 100% of Griffiths & Armour completed Jan 1, 2025. Headcount added not explicitly disclosed.
2025-03-31acquisition_additioncompleted2024-04-252024-04-25GlobalRisk Capital, Human Capitalbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of NFP Intermediate Holdings A Corp completed April 25, 2024. Headcount added not explicitly disclosed in this filing.
2025-03-31restructuringin_progressUSD 110,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-03-31restructuringin_progressAccelerating Aon United Program [Member]USD 110,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-03-31restructuringin_progressOperating Segments [Member] / Risk Capital Segment [Member] / Accelerating Aon United Program [Member]USD 19,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-03-31restructuringin_progressOperating Segments [Member] / Human Capital Segment [Member] / Accelerating Aon United Program [Member]USD 4,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-03-31restructuringin_progressSegment Reporting, Reconciling Item, Corporate Nonsegment [Member] / Accelerating Aon United Program [Member]USD 87,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-03-31restructuringin_progressTechnology And Other [Member] / Accelerating Aon United Program [Member]USD 56,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-03-31restructuringin_progressWorkforce Optimization [Member] / Accelerating Aon United Program [Member]USD 51,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2025-03-31restructuringin_progressAsset Impairments [Member] / Accelerating Aon United Program [Member]USD 3,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-12-31restructuringin_progress2023-07-012026-12-31GlobalEnterprise-wide (Risk Capital, Human Capital, and Corporate)USD 389 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Three-year Accelerating Aon United Program initiated in Q3 2023 (exact announcement date not disclosed). Charge shown is FY2024 only; cumulative costs from inception to 2024-12-31 were $524M against an expected program total of approximately $1.0B ($0.9B cash, $0.1B non-cash). FY2024 charges split by segment: Risk Capital $114M, Human Capital $27M, Corporate $248M. Employees affected not disclosed; program targets approximately $350M of annualized savings by end of 2026.
2024-12-31acquisition_additioncompleted7,7002023-12-192024-04-25United StatesRisk Capital and Human Capital (middle-market P&C brokerage, benefits, wealth and retirement consulting)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		NFP described as having more than 7,700 colleagues at acquisition; figure is approximate and as of the 2024-04-25 closing. Aggregate preliminary purchase price $9.1B. NFP contributed $1,707M of revenue in 2024.
2024-12-31divestiture_reductioncompletedGlobalThree businesses in Risk Capital and two in Human Capitalother
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Five dispositions completed during FY2024 for $700M of cash inflow net of cash and funds held on behalf of clients; pretax gains of $337M recognized. Headcount removed not disclosed. Includes the sale of the Townsend Group business, referenced in the Seventh Amendment to the Aon Deferred Compensation Plan and Eighth Amendment to the Aon Supplemental Savings Plan.
2024-12-31restructuringin_progress2023-09-012026-12-31GlobalCorporate and SegmentsUSD 389 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		Charges incurred in FY2024 for the Accelerating Aon United Program. Total expected cumulative costs are $1.0 billion. Employee count affected not explicitly disclosed for FY2024 charges.
2024-12-31acquisition_additioncompleted7,7002024-04-252024-04-25GlobalRisk Capital and Human Capitalbusiness_combinations_footnote
f5-10k / Qwen3.6-27B-Q8_0		Acquisition of NFP Intermediate Holdings A Corp completed on April 25, 2024.
2024-12-31restructuringin_progressUSD 389,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2024-12-31restructuringin_progressOperating Segments [Member] / Risk Capital Segment [Member] / Accelerating Aon United Program [Member]USD 114,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2024-12-31restructuringin_progressOperating Segments [Member] / Human Capital Segment [Member] / Accelerating Aon United Program [Member]USD 27,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2024-12-31restructuringin_progressSegment Reporting, Reconciling Item, Corporate Nonsegment [Member] / Accelerating Aon United Program [Member]USD 248,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2024-12-31restructuringin_progressAccelerating Aon United Program [Member]USD 389,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2024-12-31restructuringin_progressWorkforce Optimization [Member] / Accelerating Aon United Program [Member]USD 126,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2024-12-31restructuringin_progressTechnology And Other [Member] / Accelerating Aon United Program [Member]USD 197,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2024-12-31restructuringin_progressAsset Impairments [Member] / Accelerating Aon United Program [Member]USD 66,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2024-09-30acquisition_additioncompleted2024-04-252024-04-25GlobalCommercial Risk Solutions; Health Solutions; Wealth Solutionsbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		NFP acquisition closed 2024-04-25; filing describes NFP as having more than 7,700 colleagues but does not state a precise headcount added.
2024-09-30restructuringin_progress2023-07-01GlobalCompany-wide (technology, workforce optimization, real estate)USD 320 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three-year program initiated Q3 2023; $320M charged YTD 2024 ($69M in Q3). Cumulative costs to date $455M; expected total ~$1.0B ($900M cash / $100M non-cash). No employee counts disclosed; workforce optimization charges were $173M YTD 2024.
2024-09-30restructuringin_progress2023-07-01GlobalTechnology, Workforce, Real EstateUSD 69 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Q3 2024 charges of $69M ($320M YTD). Program initiated Q3 2023. Includes technology rationalization, headcount reduction, and asset impairments. Employee count not disclosed.
2024-09-30acquisition_additioncompleted7,7002024-04-25GlobalCommercial Risk, Health, Wealthbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of NFP completed April 25, 2024. NFP had 'more than 7,700 colleagues' at acquisition.
2024-09-30restructuringin_progressUSD 69,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-09-30restructuringin_progressAccelerating Aon United Program [Member]USD 69,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-09-30restructuringin_progressTechnology And Other [Member] / Accelerating Aon United Program [Member]USD 87,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-09-30restructuringin_progressWorkforce Optimization [Member] / Accelerating Aon United Program [Member]USD 173,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-09-30restructuringin_progressAsset Impairments [Member] / Accelerating Aon United Program [Member]USD 60,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-06-30restructuringin_progress2023-07-012026-12-31GlobalCompany-wide (technology, workforce optimization, real estate)USD 251 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three-year program initiated in Q3 2023; no headcount reduction figure disclosed. Charges of $132M in Q2 2024 and $251M YTD 2024. Program estimated at ~$1.0B cumulative (~$900M cash, ~$100M non-cash), targeting ~$350M annualized savings by end of 2026. Liability balance $158M at 2024-06-30.
2024-06-30acquisition_additioncompleted7,7002024-04-252024-04-25Global (predominantly United States)Commercial Risk Solutions, Health Solutions, Wealth Solutionsbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		NFP acquisition closed 2024-04-25; NFP described as having more than 7,700 colleagues. Purchase price ~$9.1B. NFP contributed $442M revenue and a $19M net loss attributable to Aon shareholders in Q2 2024 (from acquisition date).
2024-06-30divestiture_reductioncompleted2024-05-312024-05-31United StatesHealthy Paws managing general agent (pet insurance)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale of Healthy Paws to Chubb Limited completed 2024-05-31; no employee count disclosed. $257M pretax gain recognized on dispositions in Q2/YTD 2024.
2024-06-30restructuringin_progress2023-07-01GlobalAll functionsUSD 132 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Program initiated in Q3 2023. Q2 2024 charges of $132M include workforce optimization, asset impairments, and technology costs. Cumulative costs expected ~$1.0B. Employee count not disclosed.
2024-06-30acquisition_additioncompleted7,7002024-04-252024-04-25GlobalAll functionsbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of NFP completed April 25, 2024. NFP described as having 'more than 7,700 colleagues'.
2024-06-30restructuringin_progressUSD 132,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-06-30restructuringin_progressAccelerating Aon United Program [Member]USD 132,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-06-30restructuringin_progressTechnology And Other [Member] / Accelerating Aon United Program [Member]USD 51,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-06-30restructuringin_progressWorkforce Optimization [Member] / Accelerating Aon United Program [Member]USD 145,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-06-30restructuringin_progressAsset Impairments [Member] / Accelerating Aon United Program [Member]USD 55,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-03-31restructuringin_progress2023-07-012026-12-31GlobalCompany-wide (technology, workforce optimization, real estate)USD 119 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three-year program initiated Q3 2023; cumulative expected cost ~$1.0B ($900M cash, $100M non-cash), ~$350M annualized savings by end of 2026. Q1 2024 charges $119M; no employee count disclosed. Announcement date approximate (Q3 2023).
2024-03-31acquisition_additioncompleted2023-12-012024-04-25GlobalProperty & casualty brokerage, benefits consulting, wealth managementsubsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		NFP acquisition closed 2024-04-25 for ~$9.1B. Filing states NFP has more than 7,700 colleagues; this is target-company headcount, not a confirmed addition to Aon's reported workforce. Announcement date approximate (definitive agreement Q4 2023).
2024-03-31divestiture_reductionannounced2024-04-202024-06-30United StatesHealthy Paws (pet insurance managing general agent)subsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Definitive agreement signed to sell Healthy Paws to Chubb Limited; assets/liabilities classified as held for sale at 2024-03-31. No headcount disclosed.
2024-03-31restructuringin_progress2023-07-012026-12-31GlobalAll segmentsUSD 119 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Three-year restructuring program initiated in Q3 2023. Q1 2024 charges of $119M include workforce optimization ($64M), technology ($19M), and asset impairments ($36M). Employee count affected not disclosed in this filing.
2024-03-31acquisition_additioncompleted7,7002024-04-252024-04-25GlobalAll segmentssubsequent_events
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of NFP completed on April 25, 2024, adding more than 7,700 colleagues.
2024-03-31restructuringin_progressUSD 119,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-03-31restructuringin_progressAccelerating Aon United Program [Member]USD 119,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-03-31restructuringin_progressTechnology And Other [Member] / Accelerating Aon United Program [Member]USD 19,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-03-31restructuringin_progressWorkforce Optimization [Member] / Accelerating Aon United Program [Member]USD 64,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2024-03-31restructuringin_progressAsset Impairments [Member] / Accelerating Aon United Program [Member]USD 36,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2023-12-31restructuringin_progress2023-092026-12-31GlobalCompany-wide: technology infrastructure, leadership structure, real estateUSD 135 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Announced in Q3 2023 (exact date not disclosed). Charge shown is FY2023 only: $14M technology/other, $103M workforce optimization, $18M asset impairments. Three-year program with cumulative expected cost of ~$1,000M ($900M cash, $100M non-cash) and ~$350M annualized savings by end of 2026; no employees-affected count disclosed.
2023-12-31acquisition_additionannounced2023-12-192024-06-30United StatesNFP — financial advisory, benefits and insurance brokeragebusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Definitive agreement to acquire NFP for ~$7B cash plus ~20,000,000 class A ordinary shares; expected completion by mid-2024 subject to regulatory approval. NFP headcount not disclosed; $17M of transaction costs recognized in FY2023.
2023-12-31restructuringin_progress2023-07-012026-12-31GlobalAll segmentsUSD 135 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Accelerating Aon United Program initiated in Q3 2023. $135M incurred in 2023. Total expected cumulative costs approx $1,000M. Employee count affected not explicitly disclosed for 2023 activity.
2023-12-31restructuringin_progressUSD 135,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2023-12-31restructuringin_progressAccelerating Aon United Program [Member]USD 135,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2023-12-31restructuringin_progressWorkforce Optimization [Member] / Accelerating Aon United Program [Member]USD 14,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2023-12-31restructuringin_progressTechnology And Other [Member] / Accelerating Aon United Program [Member]USD 103,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2023-12-31restructuringin_progressAsset Impairments [Member] / Accelerating Aon United Program [Member]USD 18,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2023-12-31restructuringin_progressGlobalAon Business Services; workforce optimizationUSD 900 (millions)other
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Described as a $900 million cash restructuring charge to accelerate the Aon Business Services strategy and optimize the workforce; Appendix A reconciliation shows $135 million of Accelerating Aon United Program expenses recognized in 2023. Employees affected not disclosed in this amendment.
2023-12-31acquisition_additionannounced2023-12-19Property & casualty brokerage, benefits consulting, wealth managementother
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Definitive agreement dated December 19, 2023 to acquire NFP for approximately $7 billion in cash and approximately 20,000,000 Class A ordinary shares; headcount to be added not disclosed. $17 million of transaction costs recognized in 2023.
2023-12-31restructuringcompleted2023GlobalAon Business ServicesUSD 900 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Cash restructuring charge to accelerate Aon Business Services strategy and optimize workforce. Employee count not disclosed.
2023-09-30restructuringin_progress2023-07-01GlobalCompany-wide (technology, leadership structure, real estate)USD 1,000 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three-year program initiated in Q3 2023; ~$900M cash and ~$100M non-cash charges expected. $6M cash charges incurred in Q3/YTD 2023. No employee count disclosed; savings of ~$350M annualized targeted by end of 2026.
2023-09-30acquisition_additioncompleted2023-08-302023-08-30UruguayRisk management consultingbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of 100% of NGS (Uruguay) S.A.; headcount added not disclosed.
2023-09-30acquisition_additioncompleted2023-06-222023-06-22ChileHealth and benefits brokerage / benefit administrationbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Benefits Corredores de Seguros and Asesorías e Inversiones Benefits; headcount added not disclosed.
2023-09-30restructuringin_progress2023-09-302026-12-31GlobalAll segmentsUSD 6 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Program initiated in Q3 2023. Expected cumulative costs of ~$1,000 million ($900M cash, $100M non-cash). Includes technology streamlining, leadership optimization, and real estate footprint reduction. $6M cash charges incurred in Q3. Employee count not disclosed.
2023-09-30restructuringin_progressUSD 6,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2023-09-30restructuringin_progressAccelerating Aon United Program [Member]USD 6,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2023-06-30acquisition_additioncompleted2023-06-222023-06-22ChileHealth SolutionsUSD 9 (millions)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Benefits Corredores de Seguros and Asesorías e Inversiones Benefits (health and benefits brokerage/administration). Total consideration $9M ($7M cash, $2M contingent); no employee headcount disclosed.
2023-06-30acquisition_additioncompleted2023-06-22ChileHealth and benefits brokerageUSD 9 (millions)business_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of 100% of share capital of Benefits Corredores de Seguros and Asesorías e Inversiones Benefits. Headcount not disclosed.
2022-12-31acquisition_additioncompleted2022-03-012022-03-01United KingdomReinsurance Solutionsbusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Tyche, an actuarial software platform. Headcount added not disclosed; five 2022 acquisitions in aggregate transferred $170 million of consideration and contributed approximately $25 million of 2022 revenue
2022-12-31acquisition_additioncompleted2022-05-032022-05-03Germanybusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Acquisition of 100% of the share capital of the Karl Köllner group companies, a marine hull broker; headcount added not disclosed
2022-12-31acquisition_additioncompleted2022-08-012022-08-01United Statesbusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Purchase of certain assets of U.S. Advisors, Inc., a U.S. broker; headcount added not disclosed
2022-12-31acquisition_additioncompleted2022-09-122022-09-12United Statesbusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Purchase of certain assets of Praxiom Risk Management, a professional risk management provider; headcount added not disclosed
2022-12-31acquisition_additioncompleted2022-11-012022-11-01Mexicobusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Acquisition of 100% of the share capital of E.R.N. Evaluacion de Riesgos Naturales y Antropogenicos, S.A. de C.V., a risk assessment modeling firm; headcount added not disclosed
2022-12-31divestiture_reductioncompleted2022-12-312022-12-31discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Three dispositions completed during 2022 for $81 million net cash inflow with $54 million pretax gains; headcount removed not disclosed. Includes the sale of Aon Cyber Solutions's eDiscovery business, which triggered a partial termination of the Aon Deferred Compensation Plan and Aon Supplemental Savings Plan effective 2022-06-30 for affected participants
2022-06-30acquisition_additioncompleted2022-03-012022-03-01United KingdomWealth Solutions (actuarial software platform)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Completed acquisition of Tyche; headcount added not disclosed. Aggregate consideration for both H1 2022 acquisitions was $150 million.
2022-06-30acquisition_additioncompleted2022-05-032022-05-03GermanyCommercial Risk Solutions (marine hull broking)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Completed acquisition of 100% of Karl Köllner group companies; headcount added not disclosed.
2022-06-30divestiture_reductioncompletedNot disclosedCommercial Risk Solutions and Wealth Solutionsbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three dispositions completed in the six months ended June 30, 2022 (one in Q2); pretax gains of $47 million for the six-month period. Headcount removed not disclosed; individual disposition dates not specified.
2021-12-31acquisition_additioncompleted2021-09-012021-09-01IndiaCommercial Risk Solutionsbusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Acquisition of 51% of Aon India Insurance Brokers Limited (formerly Anviti); prior 49% equity interest fair value of $15M included in consideration. No headcount disclosed.
2021-12-31acquisition_additioncompleted2021-12-222021-12-22ItalyCommercial Risk SolutionsUSD 44 (millions)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Acquisition of 100% of For Welfare S.r.l. (bancassurance). $44M is aggregate consideration for both 2021 acquisitions (cash $27M plus deferred/contingent $17M), not this transaction alone. No headcount disclosed.
2021-12-31divestiture_reductioncompletedGlobalMultiple — includes Retiree Health Exchangediscontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Six dispositions completed during 2021 for $218M cash inflow net of cash and client funds; pretax gains of $142M recognized. Consolidated record; no per-transaction dates or headcount disclosed. Retiree Health Exchange sale triggered partial plan terminations effective 2021-10-01 (Exhibits 10.x).
2021-06-30otherannounced12021-07-272021-12-31United StatesExecutive (Special Advisor to the CEO)USD 5 (millions)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Transition and separation agreement with Anthony R. Goland; $4.5M transition payment payable in installments through 2023. Single named executive, not a broad workforce action.
2021-06-30divestiture_reductionannounced2021-07-26United StatesU.S. retirement businessother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Aquiline Agreement to sell Aon's U.S. retirement business terminated on 2021-07-26; no headcount disclosed.
2021-06-30divestiture_reductionannounced2021-07-29United StatesAon Retiree Health Exchangeother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Alight Agreement amended and restated to remove Combination closing as a condition; still subject to regulatory approvals. No headcount disclosed.
2021-06-30divestiture_reductionannounced2021-07-26GermanyRetirement and investment businessother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		LCP Agreement not terminated but closing contingent on the terminated Combination; company does not expect to consummate. No headcount disclosed.
2020-12-31acquisition_additioncompletedUnited States, Canada, Germany, Switzerland, FranceCommercial Risk Solutions; Data & Analytic ServicesUSD 419 (millions)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Consolidated record for six businesses acquired between 2020-01-01 and 2020-04-06 (CoverWallet, TRIUM, Assimedia, Apollo Conseil, Cytelligence, Farmington); $419M is aggregate consideration transferred, not a severance charge. Headcount added not disclosed; acquired businesses contributed approximately $44M of 2020 revenue.
2020-12-31divestiture_reductioncompletedother
f5-10k / MiMo-V2.6-Flash-fp8-HTML		One disposition completed during 2020 for $30 million cash inflow, net of cash sold; headcount removed not disclosed.
2020-12-31restructuringcompleted20172019-12-31GlobalAll segmentsUSD 0 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		The Restructuring Plan was closed in Q4 2019. No charges were taken in 2020. Cash payments of $127 million were made in 2020 related to prior year accruals.
2020-12-31restructuringin_progressUSD 0 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2020-09-30restructuringcompleted2017-01-012019-12-31GlobalAll segmentsUSD 0 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		The 2017 Restructuring Plan was closed in Q4 2019. No charges were taken in Q3 2020. Remaining liabilities of $64 million as of Sept 30, 2020 represent payments for previously incurred costs.
2020-09-30othercompleted2020-04-012020-09-30GlobalAll employeesMD&A
f5-10q / Qwen3.6-27B-Q8_0		Temporary salary reductions for non-executives implemented in Q2 and restored in Q3. Withheld salaries plus 5% repaid in Q3. Executive salary reductions ended effective Nov 1, 2020.
2020-09-30restructuringin_progressUSD 0 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2020-06-30othercompleted2020-06-30GlobalAllMD&A
f5-10q / Qwen3.6-27B-Q8_0		Company temporarily reduced employee salaries during Q2 2020 as a precautionary measure due to COVID-19. Salaries were restored at end of Q2, with withheld amounts to be repaid in Q3. No layoffs occurred.
2020-06-30restructuringcompleted2019-12-31GlobalAllUSD 0 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		The 2017 Restructuring Plan was closed in Q4 2019. No charges were taken in Q2 2020. Remaining liabilities of $98 million as of June 30, 2020, relate to prior period actions.
2020-06-30restructuringin_progressUSD 0 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2020-03-31otherannounced2020-04-242020-12-31GlobalExecutive leadership and non-executive directorssubsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Board approved temporary 50% base salary reduction for named executive officers and non-executive directors from May 1 through December 31, 2020 due to COVID-19. Consent forms filed as Exhibits 10.6–10.9.
2020-03-31otherannounced2020-04-272020-12-31GlobalBroader colleague basesubsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Announced temporary salary reduction of up to 20% for a broader colleague base, applied using a tailored approach based on cost-of-living and other criteria. Number of affected employees not disclosed.
2020-03-31otherannounced2020-04-302021-02-28United StatesExecutive — Co-President transitionother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Michael J. O'Connor transitioned from Co-President to Special Advisor to CEO effective February 24, 2020; separation date February 28, 2021. $7,000,000 transition bonus payable in installments. Agreement effective April 30, 2020.
2020-03-31otherin_progress2020-03-31GlobalAllMD&A
f5-10q / Qwen3.6-27B-Q8_0		Company committed to no layoffs due to COVID-19; implemented delayed hiring and temporary salary reductions for existing colleagues.
2020-03-31restructuringin_progressUSD 0 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2019-12-31restructuringcompleted5,83220172019-12-31GlobalEnterprise-wide (Aon United)USD 1,433 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Cumulative through fiscal year-end: Restructuring Plan initiated 2017 alongside the Divested Business sale, closed in Q4 2019. Cumulative charges of $1,433M (workforce reduction $619M, technology rationalization $119M, lease consolidation $69M, asset impairments $53M, other/separation $573M); 5,832 positions eliminated cumulatively. FY2019 charges were $451M; run-rate savings of $580M expected in 2020.
2019-12-31acquisition_additioncompletedFrance; SpainCommercial Risk Solutions (insurance brokerage)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Three acquisitions completed in 2019 (Chapka Assurances SAS, Ovatio Courtage SAS, Zalba-Caldu Correduria de Seguros) for $50M aggregate consideration; acquired headcount not disclosed.
2019-12-31restructuringcompleted5,8322017-01-012019-12-31GlobalAll segmentsUSD 1,433 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Global restructuring plan initiated in 2017 in connection with the sale of the Divested Business. Plan completed on December 31, 2019. Cumulative costs of $1,433 million over the three-year period, including $619 million in workforce reduction. 5,832 positions eliminated under the plan.
2019-12-31restructuringin_progress5,8322017 Plan [Member]USD 418,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2019-09-30restructuringin_progress5,35320172019-12-31GlobalAll continuing operationsUSD 1,350 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Count is cumulative inception-to-date through 2019-09-30, not a quarterly figure. Plan targets 5,400–5,600 total role eliminations; $1,263M charged inception-to-date against $1,350M estimated total (incl. $100M non-cash). Q2 2019 update added ~$125M of 2019 charges. Activities expected to affect continuing operations through Q4 2019.
2019-09-30restructuringin_progress5,3532017-01-012019-12-31GlobalAll segmentsUSD 1,263 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Cumulative positions eliminated from inception through Sept 30, 2019. Plan expected to result in cumulative charges of approx $1,350 million through end of plan.
2019-09-30restructuringin_progress5,3532017 Plan [Member]USD 1,263,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2019-09-30restructuringin_progress5,400Minimum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2019-09-30restructuringin_progress5,600Maximum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2019-06-30restructuringin_progress5,09120172019-12-31GlobalAll continuing operationsUSD 1,350 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Global Restructuring Plan initiated 2017 in connection with the sale of the Divested Business. 5,091 positions eliminated inception-to-date through 2019-06-30; estimated 5,000 to 5,600 total role eliminations expected through Q4 2019. Estimated total cost of $1,350M (includes $100M non-cash); $1,200M incurred through 2019-06-30. Q2 2019 update added ~$125M of additional estimated 2019 charges. Restructuring liability balance $184M at 2019-06-30. Not disaggregated by geography or function in the filing.
2019-06-30restructuringin_progress5,0912017-01-012019-12-31GlobalAll segmentsUSD 1,200 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Cumulative positions eliminated from inception through June 30, 2019. Plan expected to result in cumulative charges of approx $1,350 million through end of plan.
2019-06-30restructuringin_progress5,0912017 Plan [Member]USD 125,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2019-06-30restructuringin_progress5,000Minimum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2019-06-30restructuringin_progress5,600Maximum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2019-03-31restructuringin_progress4,49120172019-12-31GlobalEnterprise-wideUSD 1,225 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Positions eliminated inception-to-date through 2019-03-31; filer estimates 4,800 to 5,400 total role eliminations. Q1 2019 restructuring expense was $91M; inception-to-date expense $1,073M; estimated total program cost $1,225M. Plan initiated in 2017 alongside the Divested Business sale and expanded in Q4 2018.
2019-03-31restructuringin_progress4,4912017-01-012019-12-31GlobalAll segmentsUSD 1,073 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Cumulative positions eliminated from inception through March 31, 2019. Total estimated cost is $1,225 million.
2019-03-31restructuringin_progress4,4912017 Plan [Member]USD 88,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2019-03-31restructuringin_progress4,800Minimum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2019-03-31restructuringin_progress5,400Maximum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2018-12-31restructuringin_progress4,36620172019-12-31GlobalCompany-wideUSD 485 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Global Restructuring Plan initiated in 2017 alongside sale of the Divested Business. 4,366 positions eliminated and $982M incurred are cumulative through fiscal year-end since inception; $485M is the FY2018 charge. Estimated total program cost $1,225M with estimated 4,800 to 5,400 role eliminations through Q4 2019; $243M estimated remaining cost. Program expanded in Q4 2018 by approximately $200M ($150M cash, $50M non-cash), raising annualized savings target to approximately $500M by end of 2019.
2018-12-31acquisition_additioncompletedUnited States; New Zealand; Italy; Spain; South Africa; AustraliaCommercial Risk Solutions; Health Solutions; Retirement Solutionsbusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Eight businesses acquired during 2018 for aggregate consideration of $73M ($55M cash plus $18M deferred and contingent); acquired headcount not disclosed. Acquisitions contributed approximately $17M of revenue in 2018.
2018-12-31divestiture_reductioncompletedNot specifiedOperations previously classified as held for salediscontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Four dispositions completed during 2018; headcount removed not disclosed. Includes Q2 2018 non-cash impairment of $176M on assets held for sale following management's decision to exit certain operations, with the disposal completed in Q3 2018.
2018-12-31restructuringin_progress4,3662017-01-012019-12-31GlobalAll segmentsUSD 982 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		Cumulative positions eliminated through Dec 31, 2018. Program initiated in 2017, expanded in Q4 2018. Total estimated cost $1,225 million.
2018-12-31restructuringin_progress4,3662017 Plan [Member]USD 448,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2018-12-31restructuringin_progress5,400Maximum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10k / no-ai-xblr		Expected positions to be eliminated
2018-12-31restructuringin_progress4,800Minimum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10k / no-ai-xblr		Expected positions to be eliminated
2018-09-30restructuringin_progress3,7982019-12-31GlobalEnterprise-wideUSD 863 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Global Restructuring Plan initiated in 2017 in connection with the sale of the Divested Business; specific announcement date not stated in this filing. Charge shown is restructuring and related separation costs incurred inception-to-date through 2018-09-30 (Q3 2018: $97M; nine months 2018: $366M). Estimated total plan cost approximately $1,025M, with estimated 4,200 to 4,800 role eliminations; 3,798 positions eliminated inception-to-date. Restructuring liability balance was $195M at 2018-09-30. Activities expected to affect continuing operations through 2019; estimated annualized savings of approximately $450M by end of 2019.
2018-09-30restructuringin_progress3,7982017-01-012019-12-31GlobalAll segmentsUSD 863 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Cumulative positions eliminated from inception through Sept 30, 2018. Plan expected to result in 4,200-4,800 role eliminations with cumulative costs of approx $1,025 million.
2018-09-30restructuringin_progress3,7982017 Plan [Member]USD 336,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2018-09-30restructuringin_progress4,800Maximum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2018-09-30restructuringin_progress4,200Minimum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2018-06-30restructuringin_progress3,3372019-12-31GlobalEnterprise-wideUSD 1,025 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Global Restructuring Plan initiated in 2017 (exact announcement date not disclosed). Count of 3,337 positions eliminated is inception-to-date through 2018-06-30, not a quarterly figure; estimated 4,200-4,800 total role eliminations planned. Charge shown is estimated total plan cost; $766 million incurred inception-to-date, including $269 million in the six months ended 2018-06-30 ($195 million in Q2). Annualized savings estimated at approximately $450 million by end of 2019.
2018-06-30acquisition_additioncompletedUnited States; Spain; South Africa; AustraliaCommercial Risk Solutions; Health Solutions; Data & Analytic Servicesbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Five acquisitions completed in the six months ended 2018-06-30 for aggregate consideration of $59 million; no headcount added disclosed. Filer states results would not have been materially different had acquisitions been reported from the beginning of the period.
2018-06-30divestiture_reductionannounced2018-12-31Not specifiedCertain operations reclassified as held for saleUSD 176 (millions)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		During Q2 2018 certain assets and liabilities were reclassified as held for sale as management intends to exit certain operations; disposal expected in second half of 2018. Non-cash impairment of $176 million recognized in Amortization and impairment of intangible assets. No headcount associated with the exit disclosed; results remain in continuing operations.
2018-06-30restructuringin_progress3,3372017-01-012019-12-31GlobalAll segmentsUSD 766 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		From inception through June 30, 2018, 3,337 positions eliminated. Total expenses incurred $766 million. Plan expected to result in cumulative costs of approx $1,025 million through end of plan (2019), including estimated 4,200 to 4,800 role eliminations.
2018-06-30restructuringin_progress3,3372017 Plan [Member]USD 260,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2018-06-30restructuringin_progress4,800Maximum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2018-06-30restructuringin_progress4,200Minimum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2018-03-31restructuringin_progress3,1232019-12-31GlobalEnterprise-wideUSD 74 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Global Restructuring Plan initiated in 2017 in connection with the sale of the Divested Business; 3,123 positions eliminated inception-to-date through 2018-03-31 (not a Q1-only figure). Estimated 4,200 to 4,800 total role eliminations; estimated total plan cost approximately $1,025 million, with $571 million incurred inception-to-date and $454 million estimated remaining. Charge shown is Q1 2018 restructuring and related separation expense. Activities expected to affect continuing operations through 2019; annualized savings estimated at approximately $450 million by end of 2019. Announcement date not specified beyond 'in 2017'.
2018-03-31restructuringin_progress3,1232017-01-012019-12-31GlobalAll segmentsUSD 571 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		From inception through March 31, 2018, 3,123 positions eliminated. Total estimated cost $1,025 million. Includes $33 million expensed in Q1 2018.
2018-03-31restructuringin_progress3,1232017 Plan [Member]USD 74,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2018-03-31restructuringin_progress4,800Maximum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2018-03-31restructuringin_progress4,200Minimum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2017-12-31restructuringin_progress2,6302019-12-31GlobalContinuing operations (all functions)USD 497 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Global Restructuring Plan initiated in 2017 in connection with the sale of the Divested Business; 2,630 positions eliminated and $497M incurred from inception through 2017-12-31 (fiscal-year activity). Full program targets 4,200-4,800 role eliminations and cumulative costs of approximately $1,025M through 2019, with approximately $450M of annualized savings by end of 2019. Precise announcement date not disclosed.
2017-12-31divestiture_reductioncompleted2017-02-092017-05-01GlobalBenefits administration and business process outsourcing (Divested Business)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of the benefits administration and BPO business to affiliates of The Blackstone Group closed 2017-05-01 for $4.3B cash plus up to $500M deferred consideration; the Divested Business represented 19% of gross revenues for FY2016. Headcount transferred with the business is not disclosed.
2017-12-31acquisition_additioncompleted2017-12-31GlobalMultiple (brokerage, consulting, assessment, research businesses)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Seventeen acquisitions completed during FY2017 (aggregate consideration $1,199M); acquired businesses contributed approximately $50M of revenue in 2017. Headcount added through these acquisitions is not disclosed.
2017-12-31restructuringin_progress2,6302017-01-012019-12-31GlobalAll segmentsUSD 497 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		Global restructuring plan initiated in 2017. 2,630 positions eliminated through Dec 31, 2017. Estimated total role eliminations 4,200-4,800. Cumulative estimated costs $1,025 million.
2017-12-31divestiture_reductioncompleted2017-05-012017-05-01GlobalBenefits Administration and Business Process Outsourcingdiscontinued_operations_footnote
f5-10k / Qwen3.6-27B-Q8_0		Sale of Divested Business to Tempo Acquisition, LLC closed May 1, 2017. Employee count not explicitly disclosed for divested entity.
2017-12-31restructuringin_progress2,6302017 Plan [Member]USD 452,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2017-12-31restructuringin_progress4,800Maximum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10k / no-ai-xblr		Expected positions to be eliminated
2017-12-31restructuringin_progress4,200Minimum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10k / no-ai-xblr		Expected positions to be eliminated
2017-09-30restructuringin_progress2,40020172019GlobalAll continuing operationsUSD 750 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Estimated 2,400 to 2,850 role eliminations (value uses low end of disclosed range); 2,125 positions eliminated and $401 million of restructuring and related separation costs incurred from plan inception through 2017-09-30; estimated total cost $750 million including $50 million non-cash; estimated annualized savings of approximately $400 million by end of 2019.
2017-09-30divestiture_reductioncompleted2017-02-092017-05-01GlobalBenefits administration and business process outsourcing (Divested Business)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale of the Divested Business to Blackstone-affiliated buyer closed 2017-05-01 for $4.3 billion cash plus up to $500 million deferred consideration; headcount removed through the divestiture is not quantified in this filing.
2017-09-30restructuringin_progress2,1252017-01-012019-12-31GlobalAll continuing operationsUSD 401 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Global restructuring plan initiated in 2017 in connection with the sale of the Divested Business. From inception through Sept 30, 2017, 2,125 positions eliminated and $401M incurred. Estimated total cost $750M through end of plan (2019), including 2,400-2,850 role eliminations.
2017-09-30restructuringin_progress2,1252017 Plan [Member]USD 369,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2017-09-30restructuringin_progress2,850Maximum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2017-09-30restructuringin_progress2,400Minimum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2017-06-30restructuringin_progress1,7852019-12-31GlobalEnterprise-wide (continuing operations)USD 299 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Global Restructuring Plan initiated in 2017 in connection with the sale of the Divested Business; specific announcement date not disclosed. 1,785 positions eliminated from inception through 2017-06-30; estimated 2,400 to 2,850 total role eliminations with activities affecting continuing operations through 2019. $299 million of restructuring and related separation costs incurred through 2017-06-30 ($155 million in Q2 2017); estimated total plan cost approximately $750 million, including about $50 million of non-cash charges. Restructuring liability of $178 million at 2017-06-30. Estimated annualized savings of approximately $400 million by end of 2019. Total workforce not disclosed in this filing, so percent-of-workforce cannot be computed.
2017-06-30divestiture_reductioncompleted2017-02-092017-05-01Benefits administration and business process outsourcingother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale of the benefits administration and BPO business to Tempo Acquisition, LLC (affiliates of The Blackstone Group L.P.) closed 2017-05-01 for $4.3 billion cash at closing plus up to $500 million deferred consideration. Headcount removed through the divestiture is not disclosed; the business represented 19% of FY2016 gross revenues per Part II Risk Factors.
2017-06-30restructuringin_progress1,7852017-01-012019-12-31GlobalAll continuing operationsUSD 299 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Global restructuring plan initiated in 2017 in connection with the sale of the Divested Business. 1,785 positions eliminated through June 30, 2017. Total estimated costs approx. $750 million through end of plan, including $303 million in employee termination costs.
2017-06-30restructuringin_progress1,7852017 Plan [Member]USD 272,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2017-06-30restructuringin_progress2,850Maximum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2017-06-30restructuringin_progress2,400Minimum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2017-03-31restructuringin_progress1,0652017-02-092019-12-31GlobalContinuing operations (Aon United)USD 144 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		1,065 positions eliminated from plan inception through 2017-03-31; $144M incurred to date. Filing states plan initiated in 2017 in connection with the divestiture (Purchase Agreement dated 2017-02-09); exact plan announcement date not given. Estimated 1,600-1,900 total role eliminations and ~$750M cumulative cost through 2019, including ~$207M termination, $146M technology, $176M real estate, $40M impairments, $181M other; ~$400M annualized savings targeted by end of 2019. Restructuring liability balance $108M at 2017-03-31.
2017-03-31divestiture_reductioncompleted2017-02-092017-05-01GlobalBenefits administration and business process outsourcing (Divested Business)subsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale to Tempo Acquisition, LLC (Blackstone affiliates) closed 2017-05-01 for $4.3B cash plus up to $500M deferred consideration; ~$4.2B net cash proceeds. Headcount of the Divested Business not disclosed. Divested Business represented 19% of 2016 gross revenues. Q2 2017 expected ~$500M after-tax gain and ~$400M non-cash tradename impairment.
2017-03-31restructuringin_progress1,0652017-01-012019-12-31GlobalAll continuing operationsUSD 144 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Global restructuring plan initiated in 2017 in connection with the sale of benefits administration and business process outsourcing business. 1,065 positions eliminated through March 31, 2017. Total estimated costs of $750 million through end of plan, including $207 million in employee termination costs.
2017-03-31restructuringin_progress1,0652017 Plan [Member]USD 130,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2017-03-31restructuringin_progress1,900Maximum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2017-03-31restructuringin_progress1,600Minimum [Member] / 2017 Plan [Member]restructuring_footnote
f5-10q / no-ai-xblr		Expected positions to be eliminated
2016-12-31divestiture_reductionannounced2017-02-092017-06-30GlobalHR Solutions — Benefits Administration and HR Business Process Outsourcing (BPO)subsequent_events
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale to Tempo Acquisition, LLC (Blackstone affiliate) for $4.3 billion cash at closing plus up to $500 million deferred consideration. Headcount not disclosed; divested business represented 19% of FY2016 gross revenues. Expected to close by end of Q2 2017, subject to HSR and foreign approvals; either party may terminate if closing has not occurred by 2017-08-09.
2016-12-31restructuringannounced2017-02-09GlobalCorporate / HR Solutions (stranded costs)subsequent_events
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Aon expects to implement a cost reduction program to reduce stranded costs following the divestiture; a future charge is expected but no amount, headcount, or timing beyond the program intent is quantified.
2016-12-31acquisition_additioncompleted2016-12-26Global (Australia, New Zealand, United States, India, Brazil)Risk Solutions (5 acquisitions) and HR Solutions (3 acquisitions)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Eight business combinations completed during FY2016 (Globe Events Management, Modern Survey, Nexus Insurance Brokers/Bayfair, Univers Workplace Solutions, Cammack Health, Stroz Friedberg, CoCubes, Admix); aggregate consideration $934 million. Headcount added through these acquisitions is not disclosed; total revenue contributed by 2016 acquisitions was $68 million.
2016-12-31otherannounced2017-02-092017-06-30GlobalHR Solutionssubsequent_events
f5-10k / Qwen3.6-27B-Q8_0		Agreement to sell Benefits Administration and BPO Portfolio for $4.3 billion. Company expects to implement a cost reduction program in connection with the transaction.
2016-09-30acquisition_additionannounced2016-09-30GlobalRisk SolutionsUSD 6 (millions)MD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Agreement to acquire Stroz Friedberg announced after quarter close; about $6M in transaction costs expected in Q4 2016. No headcount disclosed.
2016-09-30voluntary_separationin_progress2016-08-012016-12-31United StatesCorporateother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Voluntary one-time lump sum offer to certain former U.S. pension plan participants; offer still open at quarter end, settlement charge expected in Q4 2016. Affects former employees, not current headcount.
2016-09-30voluntary_separationcompleted2016-03-012016-06-30United KingdomCorporateUSD 61 (millions)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		U.K. lump sum offer closed in Q2 2016; £116M ($159M) paid from plan assets and a $61M non-cash settlement charge recorded. Affects former employees.
2015-12-31acquisition_additioncompletedGlobalRisk Solutions (4); HR Solutions (3)USD 27 (millions)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Seven acquisitions completed in 2015 (4 Risk Solutions, 3 HR Solutions) for $27 million aggregate consideration; headcount added not disclosed.
2015-12-31divestiture_reductioncompletedGlobalRisk Solutions (4); HR Solutions (3)USD 82 (millions)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Seven dispositions completed in 2015 with $82 million net pretax gains recorded in Other income; headcount removed not disclosed.
2014-12-31restructuringcompleted2010-10-142013-12-31GlobalRisk Solutions and HR Solutionsrestructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Program closed in Q4 2013 with no charges in 2014; FY2014 activity limited to $83 million of cash payments, leaving $76 million of remaining restructuring liabilities at year-end. Employees affected not disclosed for FY2014.
2014-12-31acquisition_additioncompleted2014-12-31Not disclosedRisk Solutions (11 businesses) and HR Solutions (2 businesses)USD 461 (millions)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Thirteen businesses acquired during 2014 for $461 million aggregate consideration; headcount added through these acquisitions not disclosed. Charge value shown is acquisition consideration, not a severance charge.
2014-12-31divestiture_reductioncompleted2014-12-31Not disclosedRisk Solutionsdiscontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Two Risk Solutions businesses divested during 2014 with $24 million of pretax gains recognized; headcount removed not disclosed.
2014-12-31restructuringcompleted2010-10-142013-12-31GlobalRisk Solutions and HR SolutionsUSD 174 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		Aon Hewitt Restructuring Plan announced Oct 2010. Plan closed in Q4 2013. $174M expense charged in 2013 ($94M Risk Solutions, $80M HR Solutions). No charges taken in 2014. Cash payments of $83M made in 2014 against remaining liabilities.
2014-12-31restructuringin_progressAon Hewitt Restructuring Plan [Member]USD 0 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2014-09-30restructuringcompleted2010-10-142013-12-31GlobalRisk Solutions; HR Solutionsrestructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Aon Hewitt Plan closed in Q4 2013 with no 2014 charges; filing reports $70M cash payments in 2014 YTD against $90M remaining liability. No employee counts disclosed.
2014-09-30restructuringcompleted2010-10-142013-12-31GlobalRisk Solutions; HR SolutionsUSD 0 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Hewitt Plan closed in Q4 2013. No charges taken in Q3 2014. Remaining liabilities of $90 million as of Sept 30, 2014 relate to prior period actions.
2014-06-30acquisition_additioncompleted8002014-07-152014-07-15United StatesRisk Solutionssubsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		National Flood Services acquisition closed after quarter end; filing states the business has more than 800 employees across offices in Montana, Kansas, and Florida.
2014-06-30restructuringin_progress2010-10-14GlobalRisk Solutions and HR SolutionsUSD 58 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Hewitt Restructuring Plan. Cash payments of $58 million made during the six months ended June 30, 2014. Remaining liabilities of $108 million as of June 30, 2014. No new charges taken in Q2 2014.
2014-03-31restructuringcompleted2010-10-142013-12-31GlobalRisk Solutions; HR Solutionsrestructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan closed in Q4 2013; no charges taken in Q1 2014. Q1 2014 activity limited to $40M cash payments against restructuring liabilities, which fell from $166M at 2013-12-31 to $127M at 2014-03-31 (partially offset by $1M FX translation). Employee counts never disclosed in this filing; prior-year comparative ($26M charge: $15M HR Solutions, $11M Risk Solutions) not extracted.
2014-03-31restructuringin_progress2010-10-14GlobalHR Solutions and Risk SolutionsUSD 40 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Hewitt Plan. Cash payments of $40 million made in Q1 2014. No new charges taken in Q1 2014. Plan closed in Q4 2013.
2013-12-31restructuringcompleted2,9602010-10-142013-12-31GlobalPrimarily HR Solutions (Aon Hewitt, Health & Benefits, shared services); also Risk SolutionsUSD 174 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Aon Hewitt Plan closed December 2013. 2,960 positions eliminated is the cumulative plan total; $174M is the 2013 charge, with cumulative plan cost of $429M ($266M employee termination, $163M real estate rationalization). 2013 segment split: HR Solutions $80M, Risk Solutions $94M. Plan savings of about $329M realized in 2013 before reinvestment.
2013-12-31acquisition_additioncompletedNot disclosedRisk Solutions (8 businesses) and HR Solutions (3 businesses)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Eleven businesses acquired in 2013 for $54M aggregate consideration; no headcount added through these acquisitions is disclosed
2013-12-31divestiture_reductioncompletedNot disclosedRisk Solutions (7 businesses) and HR Solutions (2 businesses)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Nine businesses divested in 2013 with $10M pretax gains; no headcount removed through these dispositions is disclosed
2013-12-31restructuringcompleted2,9602010-10-142013-12-31GlobalHR Solutions and Risk SolutionsUSD 429 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Aon Hewitt Plan. Approximately 2,960 positions globally eliminated. Plan closed in December 2013. Cumulative costs of $429 million.
2013-12-31restructuringin_progressAon Hewitt Restructuring Plan [Member] / Employee Severance [Member]USD 79,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2013-12-31restructuringin_progressAon Hewitt Restructuring Plan [Member] / Lease Consolidation [Member]USD 83,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2013-12-31restructuringin_progressAon Hewitt Restructuring Plan [Member] / Impairment in Value of Assets [Member]USD 7,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2013-12-31restructuringin_progressAon Hewitt Restructuring Plan [Member]USD 174,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2013-12-31restructuringin_progressAon Hewitt Restructuring Plan [Member] / Other Restructuring Costs [Member]USD 5,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2013-12-31restructuringin_progressAon Hewitt Restructuring Plan [Member] / Risk and Insurance Brokerage Services [Member]USD 94,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2013-12-31restructuringin_progressAon Hewitt Restructuring Plan [Member] / Consulting [Member]USD 80,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2013-09-30restructuringin_progress2,9002010-10-142013-12-31GlobalAon Hewitt organization, Health & Benefits, shared services and facilitiesUSD 411 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Approximately 2,900 job eliminations planned; approximately 2,660 jobs eliminated and $364M of the $411M estimated total cost incurred from inception through 2013-09-30. Charges of $30M in Q3 2013 and $109M in YTD 2013. Costs split by segment in footnote: HR Solutions $224M to date of $244M estimated; Risk Solutions $140M to date of $167M estimated, but employee counts are not disaggregated by segment.
2013-09-30restructuringin_progress2402010-10-142013-12-31GlobalRisk SolutionsUSD 24 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Part of Aon Hewitt Plan; 240 jobs eliminated in Q3 2013 within Risk Solutions segment.
2013-09-30restructuringin_progress602010-10-142013-12-31GlobalHR SolutionsUSD 6 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Part of Aon Hewitt Plan; 60 jobs eliminated in Q3 2013 within HR Solutions segment.
2013-09-30restructuringin_progress2,660Aon Hewitt Restructuring Plan [Member]USD 109,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Employee Severance [Member]USD 12,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Asset Impairment [Member]USD 0 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Other Restructuring Costs [Member]USD 3,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Lease Consolidation [Member]USD 53,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Consulting [Member]USD 6,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Risk and Insurance Brokerage Services [Member]USD 52,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-06-30restructuringin_progress2,4202010-10-142013-12-31GlobalHR Solutions, Risk Solutions, Health & Benefits, shared services and facilitiesUSD 79 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Cumulative jobs eliminated since plan inception through 2013-06-30; plan targets approximately 2,900 job eliminations. Charge shown is six months ended 2013-06-30 ($53M in Q2); cumulative charges $334M of $411M estimated total plan cost, revised up $86M. Plan expected to affect operations through end of 2013.
2013-06-30restructuringin_progress2,4202010-10-142013-12-31GlobalHR Solutions and Risk SolutionsUSD 334 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Hewitt Plan: 2,420 jobs eliminated to date; total expenses incurred $334 million. Expected cumulative costs $411 million.
2013-06-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Consulting [Member]USD 51,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-06-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Risk and Insurance Brokerage Services [Member]USD 28,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-06-30restructuringin_progress2,420Aon Hewitt Restructuring Plan [Member]USD 79,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-06-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Asset Impairment [Member]USD 3,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-06-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Employee Severance [Member]USD 14,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-06-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Other Restructuring Costs [Member]USD 2,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-06-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Lease Consolidation [Member]USD 36,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-06-30restructuringin_progress2,900Aon Hewitt Restructuring Plan [Member] / Minimum [Member] / Employee Severance [Member]restructuring_footnote
f5-10q / no-ai-xblr
2013-03-31restructuringin_progress2,1802010-10-14GlobalHR Solutions and Risk SolutionsUSD 26 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Aon Hewitt Plan announced 2010-10-14; targets approximately 2,200 job eliminations and cumulative costs of about $325 million. The 2,180 count is cumulative eliminations from inception through 2013-03-31, not a Q1-only figure. $26 million of restructuring and related charges recorded in Q1 2013 ($15M HR Solutions, $11M Risk Solutions). Filer states activities and related expenses are expected to affect operations into 2013; no specific completion date given. Restructuring liability balance was $124 million at 2013-03-31.
2013-03-31restructuringin_progress202010-10-142013-12-31GlobalHR SolutionsUSD 15 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Part of Aon Hewitt Plan; 2,180 jobs eliminated to date. Q1 2013 charges include workforce reduction and lease consolidation.
2013-03-31restructuringin_progress62010-10-142013-12-31GlobalRisk SolutionsUSD 11 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Part of Aon Hewitt Plan; costs associated with transfer of health and benefits consulting business.
2013-03-31restructuringin_progressAon Benfield Restructuring Plan [Member]USD 0 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-03-31restructuringin_progressAon Hewitt Restructuring Plan [Member]USD 26,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-03-31restructuringin_progressRestructuring 2007 Plan [Member]USD 0 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-03-31restructuringin_progressOther Restructuring Plan [Member]USD 0 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-03-31restructuringin_progressUSD 26,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-03-31restructuringin_progressAon Hewitt Restructuring Plan [Member] / Employee Severance [Member]USD 24,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-03-31restructuringin_progressAon Hewitt Restructuring Plan [Member] / Lease Consolidation [Member]USD 2,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-03-31restructuringin_progressAon Hewitt Restructuring Plan [Member] / Asset Impairment [Member]USD 0 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-03-31restructuringin_progressAon Hewitt Restructuring Plan [Member] / Other Restructuring Costs [Member]USD 0 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-03-31restructuringin_progressAon Hewitt Restructuring Plan [Member] / Risk and Insurance Brokerage Services [Member]USD 11,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2013-03-31restructuringin_progressAon Hewitt Restructuring Plan [Member] / Consulting [Member]USD 15,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-12-31restructuringin_progress2,0002010-10-142013-12-31GlobalHR Solutions and Risk Solutions (health and benefits consulting)USD 98 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Program estimate of 2,000 positions globally; in excess of 1,900 jobs eliminated as of December 31, 2012. Charge shown is fiscal 2012 expense; cumulative charges to date were $255M against an estimated total program cost of $325M. Plan continues into 2013. Predominantly non-client-facing roles.
2012-12-31restructuringcompleted8102008-08-222012-01-31GlobalRisk SolutionsUSD 6 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Charge shown is fiscal 2012 cost; plan closed January 2012. Total program cost over the restructuring period was $159M, including 810 job eliminations and abandoned duplicate space and assets.
2012-12-31acquisition_additioncompletedRisk Solutions (6 businesses) and HR Solutions (5 businesses)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Eleven businesses acquired during 2012 with aggregate consideration of $175M; headcount added through these acquisitions is not disclosed.
2012-12-31divestiture_reductioncompletedRisk Solutions (3 businesses) and HR Solutions (1 business)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Four businesses disposed during 2012 with aggregate pretax gains of $1M; headcount removed through these dispositions is not disclosed.
2012-12-31restructuringin_progress1002010-10-142013-12-31GlobalHR Solutions and Risk SolutionsUSD 98 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		Aon Hewitt Plan announced Oct 2010. Estimated 2,000 positions globally to be eliminated. As of Dec 31, 2012, in excess of 1,900 jobs eliminated. 100 additional jobs eliminated in 2012 (1,900+ cumulative vs 1,800+ implied prior). Total charges recognized in 2012 were $98 million. Plan continues into 2013.
2012-12-31restructuringcompleted2008-11-012012-01-31GlobalRisk SolutionsUSD 6 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		Aon Benfield Plan announced Nov 2008. Included 810 job eliminations. Plan closed in Jan 2012. $6 million costs incurred in 2012.
2012-12-31restructuringin_progress Aon Hewitt Restructuring Plan / Employee SeveranceUSD 74,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2012-12-31restructuringin_progress Aon Hewitt Restructuring Plan / Lease ConsolidationUSD 18,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2012-12-31restructuringin_progress Aon Hewitt Restructuring Plan / Impairment In Value Of AssetsUSD 4,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2012-12-31restructuringin_progress Aon Hewitt Restructuring Plan / Other Restructuring CostsUSD 2,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2012-12-31restructuringin_progress Aon Hewitt Restructuring PlanUSD 98,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2012-12-31restructuringin_progress Aon Hewitt Restructuring Plan / ConsultingUSD 66,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2012-12-31restructuringin_progress Aon Hewitt Restructuring Plan / Risk And Insurance Brokerage ServicesUSD 32,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2012-12-31restructuringin_progress Aon Benfield Restructuring Plan / Employee SeveranceUSD 6,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2012-12-31restructuringin_progress Aon Benfield Restructuring PlanUSD 6,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2012-12-31restructuringin_progress1,900 Aon Hewitt Restructuring Plan / Minimum / Employee Severancerestructuring_footnote
f5-10k / no-ai-xblr
2012-09-30restructuringin_progress2,0002010-10-142013GlobalAon Hewitt organization (HR Solutions and Risk Solutions)USD 325 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Approximately 2,000 job eliminations planned; in excess of 1,800 jobs eliminated and $214M of the $325M estimated total cost incurred through 2012-09-30. Costs split by segment (HR Solutions $243M estimated, Risk Solutions $82M estimated) but employee counts are not split by segment. Activities expected to affect continuing operations into 2013.
2012-09-30restructuringcompleted81020082012-03-31GlobalRisk Solutions (Aon Benfield organization)USD 161 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan included 810 job eliminations plus abandonment of duplicate space and assets; all remaining costs incurred and plan closed in the first quarter of 2012. $8M of charges recorded in the nine months ended 2012-09-30 for final costs.
2012-09-30acquisition_additioncompletedNot disclosedHR Solutions (2 businesses) and Risk Solutions (4 businesses)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Six business acquisitions completed during the nine months ended 2012-09-30 with $110M aggregate consideration; no headcount added through these acquisitions is disclosed.
2012-09-30divestiture_reductioncompletedNot disclosedRisk Solutions (2 businesses) and HR Solutions (1 business)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three businesses sold during the nine months ended 2012-09-30 with a $1M pretax gain; no headcount removed through these dispositions is disclosed.
2012-09-30restructuringin_progress2010-10-142013-12-31GlobalHR Solutions and Risk SolutionsUSD 32 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Hewitt Plan: $32M charge in Q3 2012. Cumulative costs $214M of estimated $325M. In excess of 1,800 jobs eliminated to date. Expected to affect operations into 2013.
2012-09-30restructuringcompleted2008-01-012012-03-31GlobalRisk SolutionsUSD 8 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Benfield Plan: $8M charge in first nine months 2012. Plan closed in Q1 2012. Included 810 job eliminations.
2012-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Asset impairmentsUSD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member]USD 57,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Consulting [Member]USD 16,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Risk and Insurance Brokerage Services [Member]USD 16,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-09-30restructuringin_progressAon Benfield Restructuring Plan [Member]USD 8,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-09-30restructuringin_progressAon Benfield Restructuring Plan [Member] / Workforce reductionUSD 8,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Workforce reductionUSD 25,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Lease Consolidation [Member]USD 6,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-09-30restructuringin_progressAon Hewitt Restructuring Plan [Member] / Other Restructuring Costs [Member]USD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-09-30restructuringin_progressAon Benfield Restructuring Plan [Member] / Other Restructuring Costs [Member]USD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-09-30restructuringin_progress1,800Aon Hewitt Restructuring Plan [Member] / Minimum [Member] / Workforce reductionrestructuring_footnote
f5-10q / no-ai-xblr
2012-06-30restructuringin_progress1,5402010-10-142013GlobalAon Hewitt organization (HR Solutions and Risk Solutions)USD 325 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Cumulative jobs eliminated from plan inception through 2012-06-30; plan targets 1,500-1,800 job eliminations. Estimated total plan cost $325M; $13M expensed in Q2 2012 and $25M in six months 2012. Activities expected to affect continuing operations into 2013.
2012-06-30restructuringcompleted81020082012-03-31GlobalRisk Solutions (Aon Benfield)USD 161 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Announced in conjunction with the 2008 Benfield acquisition; exact announcement date not disclosed. Plan closed in Q1 2012 with all remaining costs incurred; $8M of charges recorded in the six months ended 2012-06-30. Inception-to-date and total plan cost $161M.
2012-06-30restructuringin_progress122010-10-142013-12-31GlobalHR SolutionsUSD 11 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Hewitt Plan: 12 job eliminations in Q2 2012; $11M charge. Plan expects 1,500-1,800 total eliminations.
2012-06-30restructuringin_progress22010-10-142013-12-31GlobalRisk SolutionsUSD 2 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Hewitt Plan: 2 job eliminations in Q2 2012; $2M charge. Includes Health and Benefits Consulting transfer.
2012-06-30restructuringcompleted2008-01-012012-03-31GlobalRisk SolutionsUSD 8 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Benfield Plan: Closed in Q1 2012. $8M charge recorded in first six months of 2012. Original plan included 810 job eliminations.
2012-06-30restructuringin_progress Aon Hewitt Restructuring PlanUSD 25,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-06-30restructuringin_progress Aon Hewitt Restructuring Plan / ConsultingUSD 11,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-06-30restructuringin_progress Aon Hewitt Restructuring Plan / Risk And Insurance Brokerage ServicesUSD 2,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-06-30restructuringin_progress Aon Benfield Restructuring PlanUSD 8,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-06-30restructuringin_progress Aon Benfield Restructuring Plan / Employee SeveranceUSD 8,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-06-30restructuringin_progress1,540 Aon Hewitt Restructuring Plan / Employee SeveranceUSD 12,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-06-30restructuringin_progress Aon Hewitt Restructuring Plan / Lease ConsolidationUSD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-06-30restructuringin_progress Aon Hewitt Restructuring Plan / Impairment In Value Of AssetUSD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-03-31restructuringin_progress2010-10-142013-12-31GlobalAon Hewitt (Risk Solutions and HR Solutions)USD 12 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan targets 1,500–1,800 job eliminations; approximately 1,186 jobs eliminated and $169 million total costs incurred inception-to-date through 2012-03-31. Estimated total plan cost is $325 million. Q1 2012 charge of $12 million split $9M HR Solutions / $3M Risk Solutions.
2012-03-31restructuringcompleted2008-01-012012-03-31GlobalRisk Solutions (Aon Benfield)USD 8 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan included 810 job eliminations; all remaining costs incurred in Q1 2012. Total plan cost $161 million. Announcement date approximate — plan announced in conjunction with the 2008 Benfield acquisition; exact date not stated in filing.
2012-03-31restructuringin_progress2010-10-142013-12-31GlobalHR SolutionsUSD 9 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Hewitt Plan: $9M charge in Q1 2012 for HR Solutions segment. Cumulative 1,186 jobs eliminated through Q1 2012.
2012-03-31restructuringin_progress2010-10-142013-12-31GlobalRisk SolutionsUSD 3 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Hewitt Plan: $3M charge in Q1 2012 for Risk Solutions segment.
2012-03-31restructuringcompleted2008-01-012012-03-31GlobalRisk SolutionsUSD 8 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Benfield Plan: $8M charge in Q1 2012. All remaining costs incurred in Q1 2012.
2012-03-31restructuringin_progress Aon Hewitt Restructuring PlanUSD 12,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-03-31restructuringin_progress1,186 Aon Hewitt Restructuring Plan / Employee SeveranceUSD 7,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-03-31restructuringin_progress Aon Hewitt Restructuring Plan / Lease ConsolidationUSD 4,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-03-31restructuringin_progress Aon Hewitt Restructuring Plan / Impairment In Value Of AssetUSD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-03-31restructuringin_progress Aon Hewitt Restructuring Plan / ConsultingUSD 9,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-03-31restructuringin_progress Aon Hewitt Restructuring Plan / Risk And Insurance Brokerage ServicesUSD 3,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-03-31restructuringin_progress Aon Benfield Restructuring PlanUSD 8,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2012-03-31restructuringin_progress Aon Benfield Restructuring Plan / Employee SeveranceUSD 8,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-12-31restructuringin_progress1,0802010-10-142013-12-31GlobalHR Solutions (primarily); Risk SolutionsUSD 105 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Jobs eliminated (1,080) and $157M cumulative charges are cumulative through 2011-12-31; $105M is the 2011 expense. Plan targets 1,500-1,800 position eliminations and $325M total cost through 2013.
2011-12-31restructuringcompleted7852008-11-012012-01-31GlobalRisk SolutionsUSD 19 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Cumulative through 2011-12-31: 785 of an estimated 800 job eliminations and $153M of $160M total cost; $19M recorded in 2011. Plan closed January 2012.
2011-12-31restructuringcompleted2007-01-012011-12-31GlobalRisk Solutions and HR Solutionsrestructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Program of approximately 4,700 job eliminations completed; no further expenses expected. 2011 activity was a net $(11)M reversal of prior accruals, not a new reduction.
2011-12-31acquisition_additioncompleted2011-04-012011-04-30International (South Africa)Risk Solutionsbusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Glenrand MIB Limited acquired April 2011 along with three other Risk Solutions businesses and one HR Solutions business; aggregate 2011 consideration $103M. Headcount added not disclosed.
2011-12-31restructuringin_progress1,0802010-10-142013-12-31GlobalHR SolutionsUSD 157 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Aon Hewitt Plan. Cumulative charges of $157 million recognized as of Dec 31, 2011. Total estimated cost $325 million. Plan continues into 2013.
2011-12-31restructuringcompleted7852008-11-012012-01-31GlobalRisk SolutionsUSD 153 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Aon Benfield Plan. Cumulative charges of $153 million recognized as of Dec 31, 2011. Plan closed in January 2012.
2011-12-31restructuringin_progress Hewitt Associates IncUSD 52,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress1,080 Aon Hewitt Restructuring Plan / Employee SeveranceUSD 64,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Aon Hewitt Restructuring Plan / Lease ConsolidationUSD 32,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Aon Hewitt Restructuring Plan / Impairment In Value Of AssetUSD 7,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Aon Hewitt Restructuring Plan / Other Restructuring CostsUSD 2,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Aon Hewitt Restructuring PlanUSD 105,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress785 Aon Benfield Restructuring Plan / Employee SeveranceUSD 33,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Aon Benfield Restructuring Plan / Lease ConsolidationUSD -15,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Aon Benfield Restructuring Plan / Other Restructuring CostsUSD 1,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Aon Benfield Restructuring PlanUSD 19,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress4,700 Restructuring2007 Plan / Employee SeveranceUSD -2,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Restructuring2007 Plan / Lease ConsolidationUSD -9,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Restructuring2007 PlanUSD -11,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Restructuring2007 Plan / Risk And Insurance Brokerage ServicesUSD -10,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Restructuring2007 Plan / ConsultingUSD -1,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Aon Hewitt Restructuring Plan / ConsultingUSD 90,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-12-31restructuringin_progress Aon Hewitt Restructuring Plan / Risk And Insurance Brokerage ServicesUSD 15,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2011-09-30restructuringin_progress1,0302010-10-142013GlobalHR SolutionsUSD 325 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan targets 1,500-1,800 job eliminations; 1,030 jobs eliminated from inception through 2011-09-30. Estimated total cost $325M ($180M workforce, $145M real estate); $132M incurred to date, including $26M in Q3 2011 and $80M in YTD 2011. Activities expected to affect continuing operations into 2013; plan expected to deliver ~$280M annual savings in 2013.
2011-09-30restructuringin_progress71520082011-12-31GlobalRisk SolutionsUSD 160 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan announced with the 2008 Benfield acquisition; includes an estimated 875 job eliminations, of which ~715 eliminated as of 2011-09-30. Estimated total cost $160M ($53M in purchase price allocation, $79M in earnings to date, ~$28M remaining). All remaining costs expected in Q4 2011. Nine months 2011 recorded a net benefit of $2M, including an $18M reversal of leasehold accruals.
2011-09-30restructuringcompleted20072010-12-31GlobalUnallocated / enterprise-wideUSD 740 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan completed in Q4 2010 with no further expenses expected; total cumulative pretax charges of $740M. No employee-elimination count disclosed. Nine months 2011 recorded an $8M restructuring benefit from reversal of leasehold accruals, plus $5M of previously accrued lease costs recorded in Other general expenses.
2011-09-30acquisition_additioncompleted2010-10-01GlobalHR SolutionsUSD 4,932 (millions)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Hewitt Associates completed 2010-10-01 for ~$4.9B cash-and-stock; no headcount added disclosed. Results included in HR Solutions from acquisition date. Related acquisition/integration costs of $22M in Q3 2011 and $42M in YTD 2011 recorded in Other general expenses.
2011-09-30acquisition_additioncompleted2011-09-30GlobalRisk Solutions; HR SolutionsUSD 100 (millions)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Nine months 2011: three acquisitions completed — one in HR Solutions and two in Risk Solutions, including Glenrand MIB Limited; aggregate consideration $100M. No headcount added disclosed for any transaction.
2011-09-30restructuringin_progress1,0302010-10-142013-12-31GlobalHR SolutionsUSD 132 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Hewitt Plan: 1,030 jobs eliminated through Sept 30, 2011. Total estimated cost $325M. Includes $80M charges in first nine months 2011.
2011-09-30restructuringin_progress7152008-01-012011-12-31GlobalRisk SolutionsUSD 132 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Benfield Plan: 715 jobs eliminated through Sept 30, 2011. Total estimated cost $160M. Net benefit of $2M recorded in first nine months 2011.
2011-09-30restructuringcompleted2007-01-012010-12-31GlobalCorporateUSD 740 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2007 Plan completed in Q4 2010. Cumulative pretax charges $740M. Restructuring benefit of $8M recorded in first nine months 2011 due to reversal of accruals.
2011-09-30restructuringin_progress Aon Hewitt Restructuring PlanUSD 80,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-09-30restructuringin_progress Aon Hewitt Restructuring Plan / Employee SeveranceUSD 15,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-09-30restructuringin_progress Aon Hewitt Restructuring Plan / Lease ConsolidationUSD 8,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-09-30restructuringin_progress Aon Hewitt Restructuring Plan / Impairment In Value Of AssetUSD 3,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-09-30restructuringin_progress Aon Hewitt Restructuring Plan / Other Restructuring CostsUSD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-09-30restructuringin_progress Aon Benfield Restructuring Plan / Lease ConsolidationUSD -1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-09-30restructuringin_progress Aon Benfield Restructuring Plan / Employee SeveranceUSD 3,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-09-30restructuringin_progress Aon Benfield Restructuring Plan / Other Restructuring CostsUSD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-09-30restructuringin_progress Aon Benfield Restructuring PlanUSD 3,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-06-30restructuringin_progress1,5002010-10-142013GlobalHR SolutionsUSD 325 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Estimated range of 1,500 to 1,800 job eliminations (lower bound shown); approximately 860 jobs eliminated and $106M of the $325M cumulative cost incurred through 2011-06-30; $54M expensed in six months 2011.
2011-06-30restructuringin_progress73020082011GlobalRisk SolutionsUSD 138 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Estimated 730 job eliminations; approximately 705 eliminated as of 2011-06-30. Of $138M total cost, $55M in purchase price allocation, $76M in earnings to date, $7M estimated future. Net restructuring benefit of $5M recorded in six months 2011.
2011-06-30restructuringcompleted20072010GlobalCompany-wideUSD 743 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Completed Q4 2010; job-elimination count not disclosed. Total cumulative pretax charges $743M. Q2 2011 recorded a $5M benefit from reversal of leasehold accruals; no further expenses expected.
2011-06-30acquisition_additioncompleted2010-10-012010-10-01GlobalHR Solutionsbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Completion date shown; announcement date not disclosed in filing. Headcount added not disclosed; total consideration $4,932M. $20M of Hewitt-related costs expensed in six months 2011.
2011-06-30acquisition_additioncompletedGlobalRisk Solutionsbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Two companies acquired in six months 2011, including Glenrand MIB Limited; exact dates and headcount added not disclosed. Aggregate consideration $92M; goodwill $59M.
2011-06-30divestiture_reductioncompletedNot disclosedRisk Solutionsother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		One company sold during six months 2011; exact date and headcount removed not disclosed. Pretax loss of $1.8M recognized on the sale.
2011-06-30restructuringin_progress2010-10-142013-12-31GlobalHR SolutionsUSD 31 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Hewitt Plan: 860 jobs eliminated to date (as of June 30, 2011). Q2 2011 charge of $31M. Total estimated cost $325M.
2011-06-30restructuringin_progress2008-01-012011-12-31GlobalRisk SolutionsUSD -12 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Benfield Plan: 705 jobs eliminated to date (as of June 30, 2011). Q2 2011 net benefit of $12M due to reversal of accruals. Total estimated cost $138M.
2011-06-30restructuringcompleted2007-01-012010-12-31GlobalCorporateUSD -5 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2007 Plan: Completed in Q4 2010. Q2 2011 benefit of $5M related to reversal of accruals for reoccupied leasehold space.
2011-06-30restructuringin_progress Aon Hewitt Restructuring PlanUSD 31,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-06-30restructuringin_progress Aon Hewitt Restructuring Plan / Employee SeveranceUSD 6,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-06-30restructuringin_progress Aon Hewitt Restructuring Plan / Lease ConsolidationUSD 20,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-06-30restructuringin_progress Aon Benfield Restructuring Plan / Employee SeveranceUSD 4,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-06-30restructuringin_progress Aon Benfield Restructuring Plan / Lease ConsolidationUSD -16,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-06-30restructuringin_progress Aon Hewitt Restructuring Plan / Impairment In Value Of AssetUSD 4,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-06-30restructuringin_progress Aon Hewitt Restructuring Plan / Other Restructuring CostsUSD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-06-30restructuringin_progress Aon Benfield Restructuring PlanUSD -12,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-03-31restructuringin_progress1,5002010-10-142013GlobalHR SolutionsUSD 23 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Estimated 1,500 to 1,800 job eliminations; approximately 730 jobs eliminated and $75 million total expense incurred from inception through 2011-03-31. Estimated total plan cost $325 million. Charge shown is Q1 2011 only.
2011-03-31restructuringin_progress71020082011GlobalRisk SolutionsUSD 7 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Estimated 710 job eliminations; approximately 700 jobs eliminated as of 2011-03-31. Estimated total plan cost $155 million ($55 million in purchase price allocation, $88 million expensed to date, $12 million expected in future earnings). Charge shown is Q1 2011 only. Announcement year only disclosed (conjunction with 2008 Benfield acquisition).
2011-03-31acquisition_additionannounced2010-12-092011-04-26South Africa and Sub-Saharan AfricaRisk Solutionssubsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Glenrand MIB Limited completed 2011-04-26 (after quarter end, before filing). Consideration $78 million cash plus $11 million escrowed pending a legal dispute. No headcount disclosed.
2011-03-31restructuringin_progress7302010-10-142013-12-31GlobalHR SolutionsUSD 23 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Cumulative jobs eliminated through March 31, 2011. Total estimated cost $325 million. Q1 2011 charges of $23 million recorded.
2011-03-31restructuringin_progress7002008-01-012011-12-31GlobalRisk SolutionsUSD 7 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Cumulative jobs eliminated through March 31, 2011. Total estimated cost $155 million. Q1 2011 charges of $7 million recorded.
2011-03-31restructuringin_progress Aon Hewitt Restructuring Plan / Employee SeveranceUSD 18,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-03-31restructuringin_progress Aon Hewitt Restructuring Plan / Lease ConsolidationUSD 5,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-03-31restructuringin_progress Aon Hewitt Restructuring PlanUSD 23,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-03-31restructuringin_progress Aon Benfield Restructuring PlanUSD 7,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2011-03-31restructuringin_progress Aon Benfield Restructuring Plan / Employee SeveranceUSD 7,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-12-31restructuringin_progress3602010-10-142013-12-31GlobalHR SolutionsUSD 52 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		360 jobs eliminated and $52M expensed during FY2010; full program targets 1,500-1,800 position eliminations and approximately $325M cumulative cost through 2013, with about $280M of annual savings expected in 2013.
2010-12-31restructuringin_progress6902008-08-222011-12-31GlobalRisk SolutionsUSD 26 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		690 jobs eliminated cumulative through FY2010 (program targets ~700); $26M charged to earnings in FY2010; total program cost estimated at $155M, of which $55M was in purchase price allocation. Activities expected to affect continuing operations into 2011.
2010-12-31restructuringcompleted4,70020072010-12-31GlobalAll segmentsUSD 94 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Cumulative through FY2010: 4,700 job eliminations and $748M total pretax charges; $94M of charges recorded in FY2010. Company states no further expenses are expected under this plan.
2010-12-31acquisition_additioncompleted2010-10-012010-10-01GlobalHR Solutionsbusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Hewitt acquisition closed 2010-10-01 for $4.9B consideration; headcount added through the acquisition is not separately disclosed. Item 1 notes the HR Solutions segment now exceeds 29,000 employees worldwide, and consolidated headcount rose from 36,200 (2009) to approximately 59,000 (2010).
2010-12-31restructuringin_progress3602010-10-142013-12-31GlobalHR SolutionsUSD 52 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		Approximately 360 jobs eliminated as of Dec 31, 2010. Total plan expected to eliminate 1,500-1,800 positions with cumulative costs of $325 million.
2010-12-31restructuringin_progress702008-08-222011-12-31GlobalRisk SolutionsUSD 26 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		Total of 690 jobs eliminated to date under plan announced in 2008. 26 million charged in 2010. Plan includes estimated 700 job eliminations total.
2010-12-31restructuringcompleted2007-01-012010-12-31GlobalCorporateUSD 94 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		2007 Plan resulted in approx 4,700 job eliminations. $94 million charged in 2010. Company does not expect further expenses.
2010-12-31restructuringin_progress Aon Benfield Restructuring Plan / Employee SeveranceUSD 15,000,000 (absolute)restructuring_footnote
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2010-12-31restructuringin_progress Aon Benfield Restructuring Plan / Lease ConsolidationUSD 7,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Aon Benfield Restructuring Plan / Other Restructuring CostsUSD 2,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Restructuring2007 Plan / Employee SeveranceUSD 72,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Restructuring2007 Plan / Lease ConsolidationUSD 15,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Restructuring2007 Plan / Impairment In Value Of AssetUSD 2,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Restructuring2007 Plan / Other Restructuring CostsUSD 5,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Restructuring2007 PlanUSD 94,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Restructuring2007 Plan / Risk And Insurance Brokerage ServicesUSD 84,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Restructuring2007 Plan / ConsultingUSD 10,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Aon Hewitt Restructuring Plan / Employee SeveranceUSD 49,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Aon Hewitt Restructuring Plan / Lease ConsolidationUSD 3,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Aon Benfield Restructuring Plan / Impairment In Value Of AssetUSD 2,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Aon Hewitt Restructuring PlanUSD 52,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-12-31restructuringin_progress Aon Benfield Restructuring PlanUSD 26,000,000 (absolute)restructuring_footnote
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2010-12-31restructuringin_progress Hewitt Associates IncUSD 52,000,000 (absolute)restructuring_footnote
f5-10k / no-ai-xblr
2010-09-30restructuringin_progress70020082011GlobalRisk and Insurance Brokerage ServicesUSD 155 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan targets 700 job eliminations; 625 had been eliminated as of 2010-09-30. Of the $155M cumulative cost, $55M was in purchase price allocation, $75M recorded in earnings to date, and $25M estimated for future earnings. Announcement date stated only as year 2008 (conjunction with Benfield acquisition); completion stated as affecting continuing operations into 2011.
2010-09-30restructuringin_progress4,7002007GlobalRisk and Insurance Brokerage Services and ConsultingUSD 749 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan targets 4,700 job eliminations; approximately 4,550 positions eliminated as of 2010-09-30. Implementation described as substantially complete with no further expenses expected. Filer presents the $749M total cost by segment ($683M Risk and Insurance Brokerage Services, $66M Consulting) but does not split headcount by segment. Announcement date stated only as year 2007.
2010-09-30restructuringannounced2010-10-142013-12-31GlobalAon Hewitt (Consulting and Outsourcing)USD 325 (millions)subsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Announced after quarter end. Filer discloses a range of 1,500 to 1,800 positions to be eliminated globally, predominantly non-client facing; no single count stated so employees_affected_count left null. Charge comprises ~$180M employee termination costs and ~$145M real estate lease rationalization costs. Expected annualized savings of ~$280M from the plan and ~$355M total across Aon Hewitt in 2013.
2010-09-30acquisition_additioncompleted2010-07-112010-10-01GlobalConsulting (Aon Hewitt)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Merger agreement dated 2010-07-11; acquisition completed 2010-10-01 in a cash-and-stock transaction valued at ~$4.9 billion (61.0 million Aon shares issued plus $2,457 million cash). Hewitt employee headcount added is not disclosed; initial purchase accounting incomplete. $33 million of pre-close acquisition, integration and financing costs recorded in the quarter.
2010-09-30restructuringin_progress752008-01-012011-12-31GlobalRisk and Insurance Brokerage ServicesUSD 20 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Benfield Plan: 625 of estimated 700 jobs eliminated as of Sept 30, 2010. $20M charged in first nine months 2010. Plan expected to affect continuing operations into 2011.
2010-09-30restructuringcompleted1502007-01-012010-09-30GlobalRisk and Insurance Brokerage Services; ConsultingUSD 95 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2007 Plan: 4,550 of estimated 4,700 positions eliminated as of Sept 30, 2010. $95M charged in first nine months 2010. Implementation substantially complete.
2010-09-30restructuringannounced1,6502010-10-142013-12-31GlobalAon Hewitt (Combined)USD 325 (millions)subsequent_events
f5-10q / Qwen3.6-27B-Q8_0		Aon Hewitt Plan announced Oct 14, 2010. Estimated 1,500 to 1,800 positions to be eliminated. Cumulative costs approx $325M through end of 2013.
2010-09-30restructuringin_progress Aon Benfield Restructuring PlanUSD 5,000,000 (absolute)restructuring_footnote
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2010-09-30restructuringin_progress Aon Benfield Restructuring Plan / Employee SeveranceUSD 3,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-09-30restructuringin_progress Aon Benfield Restructuring Plan / Lease ConsolidationUSD 2,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-09-30restructuringin_progress Aon Benfield Restructuring Plan / Impairment In Value Of AssetUSD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-09-30restructuringin_progress Aon Benfield Restructuring Plan / Other Restructuring CostsUSD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-09-30restructuringin_progress Restructuring2007 PlanUSD 3,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-09-30restructuringin_progress Restructuring2007 Plan / Employee SeveranceUSD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-09-30restructuringin_progress Restructuring2007 Plan / Lease ConsolidationUSD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-09-30restructuringin_progress Restructuring2007 Plan / Other Restructuring CostsUSD 1,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-09-30restructuringin_progress Restructuring2007 Plan / Impairment In Value Of AssetUSD 2,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-09-30restructuringin_progress Restructuring2007 Plan / Risk And Insurance Brokerage ServicesUSD 3,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-09-30restructuringin_progress Restructuring2007 Plan / ConsultingUSD 9,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-06-30restructuringin_progress59520082011GlobalRisk and Insurance Brokerage ServicesUSD 155 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan announced with the 2008 Benfield acquisition; estimated 700 job eliminations, approximately 595 eliminated as of 2010-06-30. Total estimated cost $155M: $55M in purchase price allocation, $70M recorded in earnings to date, $30M estimated for future earnings. Charges of $6M in Q2 2010 and $15M in six months 2010; $90M paid to date. Company expects effects on continuing operations into 2011.
2010-06-30restructuringin_progress4,17020072010GlobalRisk and Insurance Brokerage Services and ConsultingUSD 750 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan includes estimated 4,600 job eliminations; approximately 4,170 positions eliminated as of 2010-06-30. Substantially complete, with an additional $4M of expenses expected in 2010. Total estimated cost $750M ($746M incurred to date), split $684M Risk and Insurance Brokerage Services / $66M Consulting. Charges of $25M in Q2 2010 and $92M in six months 2010.
2010-06-30restructuringin_progress5952008-01-012011-12-31GlobalRisk and Insurance Brokerage ServicesUSD 15 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Benfield Plan: 595 jobs eliminated as of June 30, 2010 out of estimated 700. $15M charge recorded in first six months 2010. Expected to affect operations into 2011.
2010-06-30restructuringin_progress4,1702007-01-012010-12-31GlobalRisk and Insurance Brokerage Services; ConsultingUSD 92 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2007 Plan: 4,170 positions eliminated as of June 30, 2010 out of estimated 4,600. $92M charge recorded in first six months 2010. Plan substantially complete.
2010-06-30restructuringin_progress Aon Benfield Restructuring PlanUSD 6,000,000 (absolute)restructuring_footnote
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2010-06-30restructuringin_progress Aon Benfield Restructuring Plan / Employee SeveranceUSD 3,000,000 (absolute)restructuring_footnote
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2010-06-30restructuringin_progress Aon Benfield Restructuring Plan / Lease ConsolidationUSD 2,000,000 (absolute)restructuring_footnote
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2010-06-30restructuringin_progress Aon Benfield Restructuring Plan / Impairment In Value Of AssetUSD 1,000,000 (absolute)restructuring_footnote
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2010-06-30restructuringin_progress Aon Benfield Restructuring Plan / Other Restructuring CostsUSD 1,000,000 (absolute)restructuring_footnote
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2010-06-30restructuringin_progress Restructuring2007 Plan / Employee SeveranceUSD 16,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-06-30restructuringin_progress Restructuring2007 Plan / Lease ConsolidationUSD 7,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-06-30restructuringin_progress Restructuring2007 Plan / Impairment In Value Of AssetUSD 1,000,000 (absolute)restructuring_footnote
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2010-06-30restructuringin_progress Restructuring2007 Plan / Other Restructuring CostsUSD 1,000,000 (absolute)restructuring_footnote
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2010-06-30restructuringin_progress Restructuring2007 PlanUSD 25,000,000 (absolute)restructuring_footnote
f5-10q / no-ai-xblr
2010-06-30restructuringin_progress Restructuring2007 Plan / Risk And Insurance Brokerage ServicesUSD 23,000,000 (absolute)restructuring_footnote
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2010-06-30restructuringin_progress Restructuring2007 Plan / ConsultingUSD 2,000,000 (absolute)restructuring_footnote
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2010-03-31restructuringin_progress57520082011-12-31GlobalRisk and Insurance Brokerage ServicesUSD 9 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan targets ~700 job eliminations; ~575 eliminated as of 2010-03-31. Q1 2010 charge $9M; total plan cost ~$155M ($55M purchase price allocation, $64M expensed to date, $36M estimated future). Announcement date is year only (2008 Benfield acquisition).
2010-03-31restructuringin_progress3,77520072010-06-30GlobalRisk and Insurance Brokerage Services; ConsultingUSD 67 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan targets ~4,600 job eliminations; ~3,775 eliminated as of 2010-03-31. Q1 2010 charge $67M; cumulative pretax charges estimated ~$750M. Announcement date is year only (2007).
2010-03-31acquisition_additioncompleted2010-03-31GlobalConsulting; Risk and Insurance Brokerage Servicesbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Eight acquisitions completed in Q1 2010 (JP Morgan Compensation and Benefit Strategies Division plus seven companies in Risk and Insurance Brokerage Services); headcount added not disclosed.
2010-03-31restructuringin_progress5752008-01-012011-12-31GlobalRisk and Insurance Brokerage ServicesUSD 9 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Approximately 575 of estimated 700 job eliminations completed as of March 31, 2010. $9 million charged in Q1 2010. Plan expected to affect operations into 2011.
2010-03-31restructuringin_progress3,7752007-01-012010-06-30GlobalAll SegmentsUSD 67 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Approximately 3,775 of estimated 4,600 job eliminations completed as of March 31, 2010. $67 million charged in Q1 2010. Plan expected to affect operations through first half of 2010.
2009-12-31restructuringin_progress53020082011-12-31GlobalRisk and Insurance Brokerage ServicesUSD 55 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Job eliminations are cumulative through fiscal year-end (530 of an estimated 700 total). Program announced in connection with the 2008 Benfield merger; total estimated cost $155M, of which $55M sat in purchase price allocation, $55M charged to 2009 earnings (the value shown), and $45M expected in future periods. Activities expected to affect continuing operations into 2011.
2009-12-31restructuringin_progress3,10020072010-06-30GlobalRisk and Insurance Brokerage Services; ConsultingUSD 357 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Positions eliminated are cumulative through fiscal year-end (3,100 of an estimated 4,600). Charge shown is the 2009 expense only ($322M Risk and Insurance Brokerage Services, $35M Consulting); total program cost estimated at $750M. Restructuring expected to affect continuing operations through the first half of 2010.
2009-12-31divestiture_reductioncompleted20082009-01United StatesRisk and Insurance Brokerage Services (AIS Management Corporation)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sold to Mercury General Corporation for $120M cash plus potential earn-out; pretax gain of $86M. Headcount removed through the disposition was not disclosed.
2009-12-31divestiture_reductioncompleted2009-012009-08United StatesProperty & casualty underwriting operations (FFG, AIIC, Citadel)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale completed August 2009 with a pretax loss of $196M ($5M recognized in 2009, $191M in 2008). Headcount removed through the disposition was not disclosed.
2009-12-31acquisition_additioncompleted20092009GlobalRisk and Insurance Brokerage Servicesbusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		14 businesses acquired during 2009 for $274M, including Allied North America, FCC Global Insurance Services and Carpenter Moore Insurance Services. Headcount added through these acquisitions was not disclosed.
2009-12-31restructuringin_progress32220072010-06-30GlobalRisk and Insurance Brokerage ServicesUSD 322 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		2007 Plan: $322 million incurred in 2009 for Risk and Insurance Brokerage Services. Cumulative estimated cost $683 million. Expected to affect operations through first half of 2010.
2009-12-31restructuringin_progress3520072010-06-30GlobalConsultingUSD 35 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		2007 Plan: $35 million incurred in 2009 for Consulting. Cumulative estimated cost $67 million. Expected to affect operations through first half of 2010.
2009-12-31restructuringin_progress5520082011-12-31GlobalRisk and Insurance Brokerage ServicesUSD 55 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		Aon Benfield Plan: $55 million incurred in 2009. Cumulative estimated cost $155 million. Approximately 530 jobs eliminated to date. Expected to affect operations into 2011.
2009-09-30restructuringin_progress45020082011GlobalRisk and Insurance Brokerage ServicesUSD 155 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Cumulative jobs eliminated as of 2009-09-30 out of an estimated 700 total; program cost estimate reduced from $185M to $155M; $45M charged in nine months 2009 and $15M in Q3 2009; $60M paid to date; $27M purchase-price-allocation accrual reduced in Q3 2009.
2009-09-30restructuringin_progress2,70020072010GlobalRisk and Insurance Brokerage Services; ConsultingUSD 700 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Cumulative positions eliminated as of 2009-09-30 out of an estimated 4,100 total; $489M incurred to date, including $192M in nine months 2009 and $84M in Q3 2009; expected to affect continuing operations through first half of 2010.
2009-09-30divestiture_reductioncompleted2009-012009-01United StatesRisk and Insurance Brokerage Servicesother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale to Mercury General completed January 2009 for $120M cash plus up to $35M earn-out; $86M pretax gain in Q1 2009; no employee count disclosed.
2009-09-30divestiture_reductioncompleted2009-012009-08United StatesDiscontinued operations (property and casualty)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale of FFG, AIIC and Citadel completed August 2009; $194M pretax loss recognized ($3M in Q3 2009); no employee count disclosed.
2009-09-30divestiture_reductioncompleted2008-122009-02United StatesRisk and Insurance Brokerage Services (premium finance)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		U.S. premium finance sale completed February 2009; $7M pretax loss ($2M in Q1 2009); no employee count disclosed.
2009-09-30restructuringin_progress4502008-12-312011-12-31GlobalRisk and Insurance Brokerage ServicesUSD 45 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Approximately 450 jobs eliminated as of Sept 30, 2009. Plan announced in conjunction with Benfield merger in 2008. Expected to affect continuing operations into 2011. $45M recorded in nine months 2009.
2009-09-30restructuringin_progress2,7002007-01-012010-06-30GlobalAll SegmentsUSD 192 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Approximately 2,700 positions eliminated as of Sept 30, 2009. Plan announced in 2007. Expected to affect continuing operations through first half of 2010. $192M recorded in nine months 2009.
2009-06-30restructuringin_progress40020082011-12-31GlobalRisk and Insurance Brokerage ServicesUSD 81 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan announced with the 2008 Benfield Group merger; estimated 500 to 700 job eliminations, approximately 400 eliminated as of June 30, 2009. Total estimated cost $185M, of which $104M sits in Benfield purchase price allocation and $81M charges earnings; $30M expensed in six months 2009. Announcement date given only as year 2008; expected to affect continuing operations into 2011.
2009-06-30restructuringin_progress2,30020072009-12-31GlobalRisk and Insurance Brokerage Services; ConsultingUSD 550 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Estimated 3,900 job eliminations; approximately 2,300 positions eliminated through June 30, 2009. Cumulative pretax charges estimated at $550M, $405M incurred to date including $108M in six months 2009. Announcement date given only as year 2007; remaining charges expected through end of 2009. Segment split of charges disclosed (RIBS $377M to date, Consulting $28M to date) but employee counts are not split by segment.
2009-06-30restructuringin_progress4002008-12-312011-12-31GlobalRisk and Insurance Brokerage ServicesUSD 30 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Benfield Plan: 400 jobs eliminated as of June 30, 2009. Total estimated cost $185 million. $30 million expensed in first six months of 2009.
2009-06-30restructuringin_progress2,3002007-01-012009-12-31GlobalAll SegmentsUSD 108 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2007 Plan: 2,300 positions eliminated as of June 30, 2009. Total estimated cost $550 million. $108 million expensed in first six months of 2009.
2009-03-31restructuringin_progress2008-01-012011-12-31GlobalRisk and Insurance Brokerage ServicesUSD 81 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan announced with Benfield acquisition in 2008; estimated 500 to 700 job eliminations, approximately 160 eliminated as of 2009-03-31. Total plan cost ~$185M, of which $104M in purchase price allocation and $81M charged to earnings. $9M expensed in Q1 2009.
2009-03-31restructuringin_progress2007-01-012009-12-31GlobalAll segmentsUSD 34 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Plan includes estimated 3,900 job eliminations; approximately 1,900 positions eliminated as of 2009-03-31. Cumulative pretax charges estimated ~$550M, $331M incurred to date; $34M expensed in Q1 2009.
2009-03-31divestiture_reductioncompleted2008-12-012009-02-28United StatesRisk and Insurance Brokerage Services — Cananwill premium financeUSD 7 (millions)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale of U.S. premium finance operations completed February 2009; pretax loss of $7M ($5M recorded in 2008). Headcount not disclosed.
2009-03-31divestiture_reductioncompleted2008-01-012009-01-31United StatesRisk and Insurance Brokerage Services — AIS Management Corporationother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale to Mercury General Corporation completed January 2009 for $120M cash plus up to $35M earn-out; pretax gain of $86M in Q1 2009. Headcount not disclosed.
2009-03-31divestiture_reductionannounced2009-01-012009-06-30United StatesDiscontinued operations — P&C operations (FFG, AIIC, Citadel)USD 191 (millions)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Definitive agreement reached January 2009; expected completion Q2 2009. Pretax loss of ~$191M recorded in 2008 discontinued operations. Headcount not disclosed.
2009-03-31restructuringin_progress1602008-01-012011-12-31GlobalRisk and Insurance Brokerage ServicesUSD 9 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Aon Benfield Plan: 160 jobs eliminated as of March 31, 2009. Total estimated job eliminations 500-700. Q1 2009 charges of $9 million.
2009-03-31restructuringin_progress1,9002007-01-012009-12-31GlobalRisk and Insurance Brokerage Services; ConsultingUSD 34 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2007 Plan: 1,900 positions eliminated as of March 31, 2009. Total estimated job eliminations 3,900. Q1 2009 charges of $34 million.
2008-12-31restructuringin_progress1,4002007-07-012009-12-31GlobalRisk and Insurance Brokerage Services; ConsultingUSD 251 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Cumulative through fiscal year-end: 1,400 of an estimated 3,900 job eliminations had occurred by December 31, 2008. Charge shown is the 2008 expense for the 2007 Plan ($251M of the $254M total 2008 restructuring charges; the remainder relates to the completed 2005 Plan). Program estimated at approximately $550M cumulative pretax charges.
2008-12-31restructuringin_progress5002008-10-012011-12-31GlobalAon Benfield (reinsurance brokerage)USD 185 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Estimated range of 500 to 700 job eliminations; value shown is the low end of the disclosed range. Charge is cumulative program cost over three years, of which approximately $104M was recorded in the Benfield purchase price allocation and approximately $81M in operations. Announced in fourth quarter 2008 in connection with the Benfield merger; announcement date shown is approximate (quarter only disclosed).
2008-12-31acquisition_additioncompleted2008-08-222008-11-28GlobalRisk and Insurance Brokerage Services (reinsurance)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Benfield Group Limited completed November 28, 2008 for $1,281 million in cash plus $32 million of direct transaction costs; acquired headcount not disclosed.
2008-12-31divestiture_reductioncompleted2007-12-142008-04-01United StatesInsurance Underwriting (discontinued operations)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of Combined Insurance Company of America (to ACE Limited) and Sterling (to Munich Re Group) completed April 1, 2008; pretax gain of approximately $1.4 billion recognized. Headcount removed not disclosed.
2008-12-31divestiture_reductioncompleted2008-10-012009-01-31United StatesRisk and Insurance Brokerage Services (non-standard personal lines auto)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Agreement reached in October 2008 to sell AIS to Mercury General Corporation for approximately $120 million plus up to $35 million earn-out; sale completed in January 2009 (subsequent to fiscal year-end). Headcount removed not disclosed. Announcement date approximate (month only disclosed).
2008-12-31divestiture_reductioncompleted2008-12-012009-02-28United StatesRisk and Insurance Brokerage Services (premium finance — Cananwill)USD 5 (millions)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Definitive agreement signed December 2008 to sell U.S. premium finance operations to AFCO Credit Corporation; completed February 2009. Preliminary pretax loss of approximately $5 million recorded in 2008. Did not qualify as discontinued operations. Headcount removed not disclosed. Announcement date approximate (month only disclosed).
2008-12-31divestiture_reductionannounced2009-01-152009-06-30United StatesProperty & casualty insurance underwriting (run-off)USD 191 (millions)subsequent_events
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Subsequent event: definitive agreement signed January 2009 to sell FFG, Atlanta International and Citadel to National Indemnity Company; estimated pretax loss of approximately $191 million recorded in 2008 discontinued operations. Expected to close in first half of 2009. Headcount removed not disclosed. Announcement date approximate (month only disclosed).
2008-12-31restructuringin_progress1,4002007-07-012009-12-31GlobalRisk and Insurance Brokerage Services; ConsultingUSD 251 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		2007 Plan: 1,400 job eliminations occurred through end of 2008. Total estimated cumulative pretax charges $550 million. $251 million incurred in 2008.
2008-12-31restructuringannounced6002008-10-012011-12-31GlobalRisk and Insurance Brokerage ServicesUSD 185 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Aon Benfield Plan: Estimated 500 to 700 job eliminations. Cumulative costs totaling approximately $185 million over three years. Announced in Q4 2008.
2008-09-30restructuringin_progress2,70020072009-12-31GlobalRisk and Insurance Brokerage Services; ConsultingUSD 450 (millions)MD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		2007 Plan: estimated 2,700 job eliminations (300 more than previously disclosed); approximately 1,000 jobs eliminated to date. $211M incurred through 2008-09-30, including $52M in Q3 2008 and $165M in nine months 2008. Expected annualized savings of $75-80M in 2008, $220-245M in 2009, $300M by 2010. Severance liability balance $88M at 2008-09-30.
2008-09-30restructuringcompleted3,6002005GlobalEnterprise-wideUSD 368 (millions)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		2005 Plan described as substantially complete; cumulative pretax charges of $368M, including $2M in Q3 2008. Restructuring liability balance $37M at 2008-09-30. Expected annualized savings of approximately $270M by 2008.
2008-09-30restructuringin_progress2,7002007-09-302009-12-31GlobalAll SegmentsUSD 450 (millions)MD&A
f5-10q / Qwen3.6-27B-Q8_0		2007 Plan: Global restructuring to streamline organization. Estimated 2,700 jobs eliminated (300 more than previously disclosed). Cumulative pretax charges approx $450M. Approx 1,000 jobs eliminated to date as of Sept 30, 2008.
2008-09-30restructuringcompleted3,6002005-01-012008-12-31GlobalAll SegmentsUSD 368 (millions)Risk Factors
f5-10q / Qwen3.6-27B-Q8_0		2005 Plan: Substantially complete. Resulted in elimination of approx 3,600 employee positions. Cumulative pretax charges totaling $368 million.
2008-06-30restructuringin_progress2,4002009-12-31GlobalRisk and Insurance Brokerage Services; ConsultingUSD 360 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Announced during 2007 (specific date not disclosed); reductions began Q3 2007. Program targets about 2,400 job eliminations, with roughly 600 eliminated as of the filing. Cumulative pretax charges estimated at $360M, of which $159M incurred through 2008-06-30 ($53M in Q2 2008, $113M in 1H 2008). Footnote splits charges by segment (RIBS $307M, Consulting $53M) but does not split job counts by segment, so a single consolidated record is emitted. Expected annualized cost savings of $50-70M in 2008, $175-200M in 2009, $240M by 2010.
2008-06-30divestiture_reductioncompleted2007-122008-04-01United StatesInsurance Underwriting (CICA and Sterling)MD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale of Combined Insurance Company of America to ACE Limited ($2.56B cash plus a $325M pre-close dividend) and Sterling Life Insurance Company to Munich Re ($352M cash), both closed 2008-04-01. Headcount removed not disclosed. Pretax gain of approximately $1.4B recognized in Q2 2008.
2008-06-30acquisition_additionannouncedUnited States; United KingdomReinsurance BrokerageUSD 30 (millions)MD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Agreement reached in Q1 2008 to acquire substantially all of A.J. Gallagher's U.S. and U.K. reinsurance brokerage business for $30M cash plus first-year revenue of the acquired businesses. Headcount added not disclosed; closing date not stated in this filing.
2008-06-30restructuringin_progress2,4002007-01-012009-12-31GlobalAll SegmentsUSD 360 (millions)MD&A
f5-10q / Qwen3.6-27B-Q8_0		2007 Plan: Global restructuring to streamline organization. Estimated 2,400 jobs eliminated through end of 2009. Cumulative pretax charges approx $360M. Approx 600 jobs eliminated to date.
2008-06-30divestiture_reductioncompleted2007-10-012008-04-01United StatesInsurance Underwriting (Discontinued)MD&A
f5-10q / Qwen3.6-27B-Q8_0		Sale of CICA and Sterling subsidiaries completed April 1, 2008. Headcount removed not explicitly quantified in this filing.
2008-03-31restructuringin_progress2,70020072009-12-31GlobalRisk and Insurance Brokerage Services; ConsultingUSD 360 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Estimated 2,700 job eliminations beginning Q3 2007 into 2009; 500 jobs eliminated to date. Q1 2008 restructuring and related expenses were $60 million ($106 million incurred to date); total estimated program charge approximately $360 million. Segment split of estimated total: Risk and Insurance Brokerage Services $315 million, Consulting $45 million. Expected annualized cost savings of $50-70 million in 2008, $175-200 million in 2009, $240 million by 2010.
2008-03-31divestiture_reductioncompleted20072008-04-01United StatesInsurance Underwriting (CICA and Sterling subsidiaries)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		CICA sold to ACE Limited for $2.56 billion cash plus a $325 million pre-close dividend; Sterling sold to Munich Re Group for $352 million; both closed April 1, 2008 (subsequent event). Net assets approximately $1.5 billion at March 31, 2008; expected pretax gain of approximately $1.3 billion to be recognized in Q2 2008. No employee counts disclosed.
2008-03-31acquisition_additionannounced2008-03-31United States; United KingdomReinsurance BrokerageUSD 30 (millions)MD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Agreement to buy substantially all of A.J. Gallagher's U.S. and U.K. reinsurance brokerage business for $30 million cash plus first-year revenue of the acquired businesses. No headcount disclosed; announcement dated to first quarter 2008 (exact date not stated).
2008-03-31restructuringin_progress5002007-01-012009-12-31GlobalAll segmentsUSD 60 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2007 Plan: 500 jobs eliminated to date (of estimated 2,700 total). Q1 2008 charges of $60M include $51M workforce reduction.
2007-12-31restructuringin_progress2,7002007-09-302009-12-31GlobalRisk and Insurance Brokerage Services and ConsultingUSD 46 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		2007 Plan announced in third quarter 2007; $46 million of restructuring and related expenses recorded in fiscal 2007 against an estimated cumulative pretax total of approximately $360 million through the end of 2009. Estimated annualized savings of approximately $240 million by 2010. Charges by segment in 2007: Risk and Insurance Brokerage Services $41 million, Consulting $5 million; estimated program totals $320 million and $40 million respectively. Headcount reduction not split by segment.
2007-12-31restructuringin_progress3,6002005-01-012007-12-31GlobalRisk and Insurance Brokerage Services and ConsultingUSD 41 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Cumulative through fiscal year-end: 2005 Plan eliminated approximately 3,600 positions (over 3,500 already occurred by 2007-12-31) at cumulative pretax charges of $366 million, of which $41 million was incurred in fiscal 2007. Plan substantially complete; estimated annualized savings of approximately $270 million in 2008.
2007-12-31divestiture_reductionannounced2007-12-142008-06-30United States, Europe, Canada, Asia PacificInsurance Underwriting (CICA and Sterling)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Definitive agreements signed 2007-12-14 to sell Combined Insurance Company of America to ACE Limited for $2.4 billion cash and Sterling Life Insurance Company to Munich Re Group for $352 million cash, with an expected $325 million pre-closing dividend from CICA. Net assets of both subsidiaries were approximately $1.4 billion at 2007-12-31. Headcount not disclosed for the divested entities; the former Insurance Underwriting segment employed approximately 6,700 employees worldwide.
2007-12-31divestiture_reductioncompleted2007-01-012007-12-31United States, BotswanaRisk and Insurance Brokerage Servicesrestructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		In fiscal 2007 Aon sold Media Professionals, Inc. and two smaller operations (pretax gains of $32 million) and 25% of its Botswana subsidiary (pretax gain of $4 million). Headcount not disclosed.
2007-12-31restructuringin_progress2,7002007-07-012009-12-31GlobalContinuing OperationsUSD 360 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		2007 Restructuring Plan announced in Q3 2007. Estimated 2,700 job eliminations. Cumulative pretax charges estimated at $360 million. $46 million incurred in 2007.
2007-12-31restructuringcompleted3,6002005-10-012007-12-31GlobalContinuing OperationsUSD 366 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		2005 Restructuring Plan substantially complete. Elimination of approximately 3,600 employee positions. Cumulative pretax charges totaling $366 million.
2007-09-30restructuringannounced2,7002007-102009-12-31GlobalPrimarily Risk and Insurance Brokerage Services; also ConsultingUSD 360 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Announced October 2007 (subsequent event); ~$17M recorded through 2007-09-30, $4M paid. Includes workforce reduction, lease consolidation, asset impairments. Charge split by segment: Brokerage $335M, Consulting $25M; by geography: US & Americas $116M, UK $82M, EMEA $152M, Asia Pacific $10M. Employee counts not disaggregated.
2007-09-30restructuringin_progress3,60020052007-12-31GlobalRisk and Insurance Brokerage Services, Consulting, Insurance Underwriting, UnallocatedUSD 365 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three-year plan substantially complete; ~3,300 of 3,600 planned position eliminations had occurred as of 2007-09-30. $361M incurred through 2007-09-30; $4M additional expected during 2007.
2007-09-30restructuringin_progress2,7002007-10-012009-12-31GlobalRisk and Insurance Brokerage Services; ConsultingUSD 360 (millions)subsequent_events
f5-10q / Qwen3.6-27B-Q8_0		Announced in October 2007 (subsequent to quarter-end). Includes estimated 2,700 job eliminations beginning in Q3 2007 and continuing into 2009. Cumulative pretax charges estimated at $360 million.
2007-09-30restructuringin_progress3,6002005-01-012007-12-31GlobalRisk and Insurance Brokerage Services; Consulting; Insurance UnderwritingUSD 365 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2005 Restructuring Plan. Estimated 3,600 positions to be eliminated. As of Sept 30, 2007, approx 3,300 eliminations had occurred. Plan substantially complete.
2007-06-30restructuringin_progress3,60020052007-12-31Global (United States, Americas ex-U.S., United Kingdom, EMEA, Asia Pacific)All operating segments (Risk and Insurance Brokerage Services, Consulting, Insurance Underwriting)USD 365 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Three-year program begun in 2005 covering workforce reductions, lease consolidation, asset impairments and related costs. Approximately 3,100 of the 3,600 planned position eliminations had occurred as of 2007-06-30. $361M expensed inception-to-date with $4M estimated for the remainder of 2007; Q2 2007 restructuring benefits estimated at $58M. Charges are disaggregated by segment and geography in the footnote, but employee counts are disclosed only on a consolidated basis, so a single consolidated record is emitted.
2007-06-30otherannounced2007-07-31United States, Canada, Europe, Asia PacificInsurance Underwriting — Combined Insurance Company of America and subsidiaries (incl. Sterling Life Insurance Company)subsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Post-quarter announcement that the company is considering strategic options for CICA; preparations are being made for a potential spin-off to shareholders while remaining open to buyer inquiries. No workforce figures, charge, or completion timeline disclosed.
2007-06-30restructuringin_progress3,6002005-01-012008-12-31GlobalAll SegmentsUSD 365 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2005 Restructuring Plan. Total estimated positions to be eliminated is 3,600. As of June 30, 2007, approximately 3,100 eliminations had occurred. Cumulative pretax charges estimated at $365 million.
2007-03-31restructuringin_progress3,60020052007-12-31United States; United Kingdom; Continent of Europe; Rest of WorldRisk and Insurance Brokerage Services; Consulting; Insurance Underwriting; UnallocatedUSD 365 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Estimated total of 3,600 positions to be eliminated; approximately 2,800 eliminations had occurred as of 2007-03-31. Estimated total program charge $365M, of which $335M incurred inception-to-date and $10M in Q1 2007; remaining $30M expected during 2007. Filer breaks the program out by geography and by segment in dollars only, not by headcount, so a single consolidated record is emitted. Annualized cost savings of approximately $280M targeted by 2008; approximately $46M of estimated restructuring benefits in Q1 2007.
2007-03-31acquisition_additioncompletedUnited Kingdom; United StatesRisk and Insurance Brokerage Services (U.K. affinity); technology platformUSD 190 (millions)MD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Q1 2007 acquisitions spend of $190M included purchases of Footman James (U.K. affinity market) and Valley Oak Systems (U.S.); no headcount added disclosed.
2007-03-31restructuringin_progress2005-01-012008-12-31GlobalAll SegmentsUSD 10 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2005 Restructuring Plan. Q1 2007 charges of $10M incurred. Cumulative charges $335M of estimated $365M total. Plan expected to eliminate 3,600 positions; approx. 2,800 eliminations occurred as of March 31, 2007. Remaining costs expected in 2007.
2006-12-31restructuringin_progress3,6002005-09-302008-12-31United States; United Kingdom; Continent of Europe; Rest of WorldPrimarily Risk and Insurance Brokerage Services; also Consulting, Insurance Underwriting and UnallocatedUSD 167 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Program total of approximately 3,600 positions to be eliminated is cumulative through fiscal year-end; approximately 2,500 eliminations had occurred as of 2006-12-31. Charge of $167 million is the 2006 expense only; cumulative program cost is $365 million ($158 million in 2005 plus $40 million estimated for 2007). Announced in third quarter 2005.
2006-12-31divestiture_reductioncompleted2006-11-30WorldwideInsurance Underwriting (Aon Warranty Group) and Risk and Insurance Brokerage Services / Insurance Underwriting (Construction Program Group)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		AWG and CPG businesses sold November 30, 2006, along with a non-core Australian brokerage unit; headcount removed through these dispositions was not disclosed. Approximately $800 million in gross cash proceeds received.
2006-12-31acquisition_additioncompleted2006-12-31Primarily Risk and Insurance Brokerage Services operationsRisk and Insurance Brokerage Services; ConsultingUSD 138 (millions)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Several small acquisitions completed in 2006 for $138 million cash; headcount added through these acquisitions was not disclosed. Charge value shown is cash consideration, not a workforce charge.
2006-12-31restructuringin_progress2,5002005-09-302008-12-31GlobalAll SegmentsUSD 167 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Announced in Q3 2005. Expected to eliminate approximately 3,600 positions total. As of Dec 31, 2006, approximately 2,500 eliminations had occurred. $167 million incurred in 2006; total expected cumulative pretax charges $365 million.
2006-09-30restructuringin_progress3,20020052007-12-31Global (U.S., U.K., Continent of Europe, Rest of World)Primarily Risk and Insurance Brokerage Services; also Consulting, Insurance Underwriting, CorporateUSD 300 (millions)MD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		2005 Restructuring Plan expected to eliminate or outsource 3,200 positions, up 800 from Q2 2006 on added offshoring/outsourcing. $239M of the ~$300M cumulative pretax charge incurred through 2006-09-30 ($31M est. Q4 2006, $30M est. 2007); expected annualized pretax savings ~$210M by 2008. Position count is a consolidated program total; segment/geography tables disclose charges only, not headcount.
2006-09-30divestiture_reductionin_progress2006-062006-12-31Insurance Underwriting (Aon Warranty Group — warranty and credit operations)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Definitive agreement to sell AWG to Warrior Acquisition Corp. (Onex affiliate) for ~$710 million; closing conditional on regulatory approvals, expected Q4 2006. No headcount associated with the sale is disclosed.
2006-09-30divestiture_reductionannounced2006-102006-12-31Construction Program Group (managing general underwriter), previously in Risk and Insurance Brokerage Services and Insurance Underwritingsubsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Post-quarter letter of intent (October 2006) to sell CPG to Old Republic Insurance Company for $85 million cash plus transfer of ~$300 million of unearned premium and claims reserves; expected to close Q4 2006. No headcount disclosed.
2006-09-30restructuringin_progress2005-01-012007-12-31GlobalAll SegmentsUSD 29 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2005 Restructuring Plan. Q3 2006 charges: $10M workforce reduction, $12M lease consolidation, $3M asset impairments, $4M other. Total estimated cost $300M. Expected to eliminate 3,200 jobs.
2006-09-30restructuringin_progress2005-01-012007-12-31United StatesAll SegmentsUSD 18 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Geographic breakdown of Q3 2006 restructuring charges.
2006-09-30restructuringin_progress2005-01-012007-12-31United KingdomAll SegmentsUSD 14 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Geographic breakdown of Q3 2006 restructuring charges.
2006-09-30restructuringin_progress2005-01-012007-12-31Continent of EuropeAll SegmentsUSD -5 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Geographic breakdown of Q3 2006 restructuring charges. Negative value indicates reversal or adjustment.
2006-09-30restructuringin_progress2005-01-012007-12-31Rest of WorldAll SegmentsUSD 2 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Geographic breakdown of Q3 2006 restructuring charges.
2006-09-30restructuringin_progress2005-01-012007-12-31GlobalRisk and Insurance Brokerage ServicesUSD 23 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Segment breakdown of Q3 2006 restructuring charges.
2006-09-30restructuringin_progress2005-01-012007-12-31GlobalConsultingUSD 5 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Segment breakdown of Q3 2006 restructuring charges.
2006-09-30restructuringin_progress2005-01-012007-12-31GlobalCorporate and OtherUSD 1 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Segment breakdown of Q3 2006 restructuring charges.
2006-06-30restructuringin_progress2,4002007-12-31Global (costs incurred across United States, United Kingdom, Continent of Europe, Rest of World)Primarily Risk and Insurance Brokerage Services; also Consulting, Insurance Underwriting, CorporateUSD 300 (millions)MD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		2005 Restructuring Plan commenced in 2005 (exact announcement date not stated in filing); program expected to eliminate 2,400 job positions via workforce reductions, lease consolidations, asset impairments and other costs; $210M of the ~$300M cumulative pretax charge incurred through 2006-06-30, remainder expected through end of 2007; filer states it is exploring additional initiatives that may be decided in 2H 2006. Filer does not disclose employee counts by segment or geography, only charges, so no sub-component records emitted.
2006-06-30divestiture_reductionannounced2006-06-302006-12-31Global (Aon Warranty Group worldwide operations)Insurance Underwriting (warranty and credit operations)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Definitive agreement to sell Aon Warranty Group to Warrior Acquisition Corp. (Onex affiliate) for ~$710 million, subject to regulatory approvals; no headcount associated with the divestiture is disclosed.
2006-06-30divestiture_reductioncompleted2006-03-31AustraliaRisk and Insurance Brokerage Services (non-core Australian brokerage unit)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Non-core Australian brokerage unit committed for sale in Q4 2005 and sold in first quarter 2006 with a pretax gain of $1 million; no headcount disclosed.
2006-06-30restructuringin_progress2005-01-012007-12-31GlobalAll SegmentsUSD 52 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2005 Restructuring Plan. YTD 2006 charges of $52M. Plan expected to eliminate 2,400 job positions total by 2007. Employee count for Q2/YTD not explicitly disclosed, only financial charges.
2006-03-31restructuringin_progress2,2002007-12-31Global (United States, United Kingdom, Continent of Europe, Rest of World)All segments (Risk and Insurance Brokerage Services, Consulting, Insurance Underwriting, Corporate and Other)USD 290 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		2005 Restructuring Plan announced in 2005 (exact announcement date not stated in filing); expected to eliminate 2,200 job positions via workforce reductions, lease consolidations and asset impairments. Estimated total pretax charges $290M through 2007; $191M incurred inception-to-date and $33M in Q1 2006. Charges by segment: Brokerage Services $256M, Consulting $25M, Insurance Underwriting $3M, Corporate and Other $6M (estimated totals). Expected annualized pre-tax savings of at least $190M by 2008. Employee-affected count disclosed only as a program-level total, not by segment.
2006-03-31divestiture_reductioncompleted2006-03-31AustraliaRisk and Insurance Brokerage Servicesother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Non-core Australian brokerage unit committed for sale in Q4 2005 and sold during Q1 2006, resulting in a pretax gain of $1M. No headcount impact disclosed.
2006-03-31restructuringin_progress2005-01-012007-12-31GlobalAll SegmentsUSD 33 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		2005 Restructuring Plan. Total estimated charges $290M. Q1 2006 charges: $25M workforce reduction, $5M lease consolidation, $1M asset impairments, $2M other. Plan expected to eliminate 2,200 job positions total.
2005-12-31restructuringin_progress1,8002005-082007-12-31Worldwide (United States, United Kingdom, Continent of Europe, Rest of World)All segments (primarily Risk and Insurance Brokerage Services)USD 262 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Cumulative program figures: approximately 1,800 positions to be eliminated and $262 million of cumulative pretax charges through 2007, of which $158 million of charges were incurred in fiscal 2005 ($81 million estimated for 2006, $23 million for 2007). Charges by segment in 2005: Brokerage $143M, Consulting $8M, Insurance Underwriting $3M, Corporate $4M. Targeted annualized savings of approximately $180 million by 2008.
2005-12-31divestiture_reductioncompletedUnited StatesRisk and Insurance Brokerage Services — wholesale brokerage (Swett & Crawford)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of Swett & Crawford completed in fourth quarter 2005, resulting in a pretax gain of $239 million; associated headcount reduction not disclosed. Exact announcement and completion dates not stated.
2005-12-31divestiture_reductionannounced2005-12-31AustraliaRisk and Insurance Brokerage Services — non-core brokeragediscontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Aon committed to sell a small non-core Australian brokerage unit at December 31, 2005; transaction completed in January 2006 for a nominal pretax gain. Headcount not disclosed.
2005-12-31restructuringin_progress1,8002005-08-012007-12-31GlobalAll SegmentsUSD 262 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Announced in August 2005 (third quarter). Expected to result in elimination of approximately 1,800 employee positions, office closures, and asset impairments. Cumulative pretax charges expected to be $262 million over three years. $158 million incurred in 2005.
2005-09-30restructuringin_progress1,4002005-08-022007-12-31Worldwide (U.S., U.K., Continent of Europe, Rest of World)All segmentsUSD 250 (millions)MD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Program covers employee termination, lease consolidation, asset impairments and other costs; $35M incurred in Q3 2005, remainder through 2007. Sub-component: 750 U.K. positions announced 2005-10-05 (subsequent event) with estimated cost of $54M; remaining positions not yet announced by geography. Headcount not broken out by segment.
2005-09-30divestiture_reductionannounced2005-092005-11United StatesRisk and Insurance Brokerage Services — Swett & Crawford wholesale brokerageother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Definitive sale agreement signed September 2005, closing anticipated November 2005; operations reclassified to discontinued operations. Associated headcount not disclosed; pretax gain expected.
2005-09-30restructuringin_progress2005-08-022007-12-31GlobalAll segmentsUSD 250 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Company announced review of revenue potential and cost structure. Cumulative pretax charges estimated at $250 million including employee termination, lease consolidation, and asset impairments. Q3 2005 incurred $35 million in expenses.
2005-09-30restructuringannounced7502005-10-05United KingdomRisk and Insurance Brokerage ServicesUSD 54 (millions)subsequent_events
f5-10q / Qwen3.6-27B-Q8_0		Subsequent to quarter end, company notified UK employees of up to 750 position eliminations. Estimated costs of $54 million.
2005-06-30restructuringannounced2005-08-02GlobalAll businesses (company-wide)USD 200 (millions)subsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Charge disclosed as a range of $200 million to $300 million covering one-time employee termination benefits, lease consolidation losses and long-lived asset impairments. No employee count disclosed; no expense recorded through 2005-06-30; expected to begin affecting continuing operations in Q3 2005; anticipated annualized cost savings of $100 million to $150 million.
2005-06-30divestiture_reductionannouncedUnited StatesRisk and Insurance Brokerage Services — Swett & Crawford wholesale brokerageother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Intention to divest announced in Q1 2005 (exact date not stated in this filing); unit classified as held for sale at 2005-06-30 with $505 million assets and $373 million liabilities reclassified. No employee count disclosed; no loss expected on sale.
2005-06-30restructuringin_progressBrokerage operations (business transformation plan)USD 5 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Legacy program begun in 2000 ($294 million recorded 2000-2002); $5 million remaining liability principally for termination benefits, of which $2 million payable in remainder of 2005 and $1 million in 2006. $1 million paid in six months ended 2005-06-30. No employee count disclosed.
2005-06-30restructuringannounced2005-08-02GlobalAll segmentsUSD 250 (millions)subsequent_events
f5-10q / Qwen3.6-27B-Q8_0		Company announced review of revenue potential and cost structure; expects restructuring expenses of $200M-$300M including employee termination benefits. No expenses recorded through June 30, 2005.
2005-03-31restructuringin_progressBrokerage operationsUSD 5 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Business transformation plan initiated 2000; $5M remaining termination-benefit liability, with $2M expected in remainder of 2005 and $2M in 2006. No employee count disclosed; $1M paid in Q1 2005.
2005-03-31divestiture_reductionannounced2005-03-31United StatesRisk and Insurance Brokerage Services (Swett & Crawford wholesale brokerage)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Q1 2005 announcement of intent to divest Swett & Crawford; assets/liabilities reclassified to held-for-sale. No headcount disclosed; no impairment expected.
2005-03-31restructuringin_progressBrokerage operationsUSD 1 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Payments related to business transformation plan initiated in 2000. Remaining liabilities of $5 million for termination benefits.
2005-03-31restructuringin_progressAlexander and Alexander Services / Bain Hogg acquisitionsUSD 1 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Cash payments for lease abandonments and other exit costs from 1996/1997 acquisitions. Remaining liability of $31 million.
2004-12-31divestiture_reductioncompleted2004-11-302004-11-30United StatesRisk and Insurance Brokerage Services — Claims Servicesdiscontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of Cambridge Integrated Services Group claims administration business for $90 million cash plus $15 million convertible preferred stock; pretax gain of ~$15 million. Headcount not disclosed.
2004-12-31divestiture_reductioncompleted2004-01-012004-06-30United KingdomRisk and Insurance Brokerage Services — Claims Servicesdiscontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of certain U.K. claims services businesses committed in Q1 2004, completed early Q2 2004, with a pretax loss of $24 million on revaluation. Headcount not disclosed.
2004-12-31divestiture_reductioncompleted2004-04-012004-09-30United KingdomRisk and Insurance Brokerage Services — Reinsurance Brokeragediscontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of U.K. reinsurance brokerage runoff unit committed in Q2 2004, completed early Q3 2004, pretax gain of $1 million. Headcount not disclosed.
2004-12-31divestiture_reductioncompleted2004-01-012004-03-31not specifiedConsultingdiscontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of a non-core Consulting subsidiary in Q1 2004 for a pretax gain of $4 million. Headcount not disclosed.
2004-12-31divestiture_reductioncompleted2004-07-012004-12-31United StatesRisk and Insurance Brokerage Servicesdiscontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of a small non-core U.S. brokerage unit; committed Q3 2004 with a $4 million pretax revaluation loss, sold Q4 2004. Headcount not disclosed.
2004-12-31otherin_progress2004-10-22GlobalRisk and Insurance Brokerage Services; ConsultingItem_1_Business
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Termination of contingent commission arrangements with underwriters announced 2004-10-22; ~$47 million of estimated lost 2004 contingent commission revenue. Business-model change, not a headcount action; no employee reductions disclosed.
2004-12-31otherin_progress2004-07-012011-12-31United StatesInformation TechnologyMD&A
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Outsourcing of most U.S. information technology infrastructure to Computer Sciences Corporation began Q3 2004; seven-year agreement with ~$300 million expected aggregate savings from second half of 2005. Employees affected not disclosed.
2004-09-30restructuringin_progress2000-Q4GlobalCorporate / All SegmentsUSD 1 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Payments of $1 million made YTD 2004 related to termination benefits from the Business Transformation Plan initiated in Q4 2000. Remaining liability of $4 million.
2004-09-30restructuringin_progressGlobalCorporate / All SegmentsUSD 9 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Payments of $9 million made YTD 2004 on restructuring charges and purchase accounting liabilities relating to prior business combinations. Remaining liability of $32 million for lease abandonments and exit costs.
2004-06-30restructuringin_progress2000-Q4United States; United KingdomRisk and Insurance Brokerage ServicesUSD 1 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Payments of $1 million made in first six months 2004 related to termination benefits from plan initiated in Q4 2000. All terminations have occurred. Remaining liability of $10 million.
2004-03-31restructuringin_progressUnited States; United KingdomRisk and Insurance Brokerage Servicesother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Program begun in Q4 2000; all terminations already occurred by 2002. Q1 2004 cash payments of $1 million; remaining liability of $10 million for termination benefits at 2004-03-31 ($5 million expected remainder of 2004, $3 million in 2005). No employee counts disclosed.
2004-03-31divestiture_reductioncompleted2004-01-012004-03-31United KingdomRisk and Insurance Brokerage Services — claims services businessesother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale of all but one U.K. claims services business completed during Q1 2004; remaining business agreed for sale in early Q2 2004. Pretax loss on revaluation of $24 million. Headcount removed not disclosed.
2004-03-31divestiture_reductioncompleted2004-01-012004-03-31Consulting — non-core subsidiaryother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Non-core Consulting subsidiary sold in early Q1 2004; pretax gain on sale of $4 million. Headcount removed not disclosed.
2004-03-31restructuringin_progress2000-Q4United States, United KingdomRisk and Insurance Brokerage ServicesUSD 1 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Payments of $1 million made in Q1 2004 related to termination benefits from plan initiated in Q4 2000. Remaining liability of $10 million.
2003-12-31restructuringcompleted3,7002000-12-312003-12-31United States and United KingdomRisk and Insurance Brokerage Servicesrestructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Cumulative through fiscal year-end for the multi-year business transformation plan; filer states all terminations have occurred. Approximately 3,700 employees departed voluntarily or had positions eliminated. Termination-benefit expense was $109M in 2001 (3,150 employees notified) and $54M in 2000 (750 employees notified); 2003 activity was limited to $17M of cash payments against the remaining liability.
2003-12-31divestiture_reductioncompleted2003-07-012003-12-31United StatesAutomotive finance servicing (discontinued operation)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale decided in third quarter 2003 and completed in fourth quarter 2003 for net proceeds of approximately $18M; business had been in run-off since first quarter 2001. No headcount associated with the disposition is disclosed.
2003-12-31otherannounced2003-12-31United KingdomClaims servicesMD&A
f5-10k / MiMo-V2.6-Flash-fp8-HTML		In 2003 Aon announced it was evaluating strategic options for the claims services group; in early 2004 it reached an agreement in principle to sell two U.K. claims units. No headcount disclosed.
2003-12-31otherin_progress2003-02-012005-12-31Mexico, Argentina, Brazil, United Kingdom, United StatesInsurance Underwriting — Accident & Health and Life (run-off of non-core operations)MD&A
f5-10k / MiMo-V2.6-Flash-fp8-HTML		February 2003 announcement to place Latin American A&H underwriting in run-off, transfer U.S. large employer group life and accidental death business to a third party via indemnity reinsurance, and run off certain non-core U.K. special risk A&H business; complete withdrawal expected in 2005. No associated headcount disclosed.
2003-12-31restructuringcompleted3,7002000-Q42003-12-31United States and United KingdomRisk and Insurance Brokerage Servicesrestructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		Approximately 3,700 employees departed voluntarily or had positions eliminated as part of the business transformation plan initiated in Q4 2000. All terminations have occurred.
2003-09-30divestiture_reductionannounced2003-09-302004-09-30United StatesAutomotive finance servicing business (Corporate and Other segment)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		In Q3 2003 Aon committed to a formal plan to sell its automotive finance servicing business (in run-off since Q1 2001), anticipating completion within twelve months. No employee count disclosed; pretax loss from discontinued operations in Q3 2003 was $39 million ($15M operating loss, $24M revaluation loss).
2003-09-30restructuringin_progressUnited States; United KingdomRisk and Insurance Brokerage Servicesother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Legacy business transformation plan (initiated Q4 2000); $9 million paid in first nine months 2003, remaining termination-benefit liability of $21 million at 2003-09-30. No employee counts disclosed in this filing.
2003-09-30restructuringin_progress2000-Q4United States; United KingdomRisk and Insurance Brokerage ServicesUSD 1 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Payments of $1 million made in Q3 2003 related to termination benefits from the 2000 Business Transformation Plan. Remaining liability of $21 million.
2003-09-30restructuringin_progress1996-1997GlobalBrokerage OperationsUSD 7 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Payments of $7 million made in first nine months 2003 on restructuring charges and purchase accounting liabilities relating to Alexander & Alexander and Bain Hogg acquisitions. Remaining liability of $46 million for lease abandonments and other exit costs.
2003-06-30restructuringin_progress2000United States; United KingdomRisk and Insurance Brokerage Servicesrestructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Comprehensive transformation plan begun Q4 2000; $294M net expenses recorded 2000-2002. Most terminations already occurred; $8M paid in first half 2003; $23M liability remains at 2003-06-30. No employee count disclosed.
2003-06-30divestiture_reductionin_progress2003-022003Mexico; Argentina; Brazil; United StatesInsurance Underwriting — accident and health; large company group lifeMD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Announced Feb 2003 discontinuance of A&H underwriting in Mexico, Argentina, Brazil and large company group life business; group life transferred to a third party via indemnity reinsurance. Plan to withdraw completely during 2003. No headcount disclosed.
2003-06-30divestiture_reductionin_progressUnited KingdomInsurance Underwriting — non-core accident and healthMD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Recent decision to exit certain non-core UK accident and health business; minimal revenues and pretax income in first half 2003. No announcement date or headcount disclosed.
2003-06-30otherin_progress2004-12-31United StatesCorporate and Other — auto finance service businessother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Aon decided to wind down the auto finance service business, reclassified from Risk and Insurance Brokerage Services to Corporate and Other in 2003; expected substantially finished by end of 2004. No headcount disclosed.
2003-06-30restructuringin_progress2000-Q4United States and United KingdomRisk and Insurance Brokerage ServicesUSD 4 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Payments of $4 million made in Q2 2003 related to termination benefits and other exit costs from a plan initiated in Q4 2000. Remaining liability of $23 million.
2003-06-30restructuringin_progress1996-1997GlobalBrokerage OperationsUSD 3 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Payments of $3 million made in Q2 2003 on restructuring charges and purchase accounting liabilities relating to business combinations (Alexander & Alexander and Bain Hogg acquisitions). Remaining liability of $48 million.
2003-06-30divestiture_reductioncompleted2003-022003-12-31Mexico, Argentina, Brazil, United KingdomInsurance UnderwritingMD&A
f5-10q / Qwen3.6-27B-Q8_0		Discontinued accident and health insurance underwriting operations in Latin America and large company group life business. Exiting certain non-core accident and health business in the U.K. Plan to completely withdraw from Latin American operations during 2003.
2003-03-31restructuringin_progress2000-10-01United States; United KingdomRisk and Insurance Brokerage Servicesrestructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Comprehensive business transformation plan begun Q4 2000; $4M cash payments in Q1 2003; remaining termination benefits liability $25M at 3/31/03; no employee count disclosed.
2003-03-31divestiture_reductionannounced2003-02-012003-12-31Mexico; Argentina; Brazil; United StatesInsurance Underwriting — accident & health and large company group lifeMD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Discontinued lines generated $7M revenue and $2M losses in Q1 2003; group life transferred via indemnity reinsurance; no headcount disclosed.
2003-03-31otherin_progress2004-12-31United StatesCorporate and Other — auto finance service businessMD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Aon decided to wind down auto finance service obligations, expected substantially finished by end of 2004; no headcount disclosed.
2003-03-31divestiture_reductioncompleted2002-10-012003-03-31United StatesInsurance Underwriting — Sheffield Insurance CorporationMD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale of Sheffield completed March 2003 for approximately book value, $30M cash; no headcount disclosed.
2003-03-31restructuringin_progress2000-10-012004-12-31United States; United KingdomRisk and Insurance Brokerage ServicesUSD 4 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Ongoing plan approved in Q4 2000. Q1 2003 cash payments of $4 million for termination benefits. Remaining termination benefits of $15 million expected to be paid in 2003 and $6 million in 2004.
2003-03-31restructuringin_progress1996-01-01GlobalBrokerage OperationsUSD 2 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Related to acquisition of Alexander & Alexander Services, Inc. Q1 2003 payments of $2 million on restructuring charges and purchase accounting liabilities. Remaining liability of $49 million for lease abandonments and other exit costs.
2003-03-31divestiture_reductionannounced2003-02-012003-12-31Mexico; Argentina; BrazilInsurance UnderwritingMD&A
f5-10q / Qwen3.6-27B-Q8_0		Announced discontinuance of accident and health insurance underwriting operations in Mexico, Argentina, and Brazil, as well as large company group life business. Plan to complete exiting these businesses during 2003.
2002-12-31restructuringcompleted3,7002000-10-012002-12-31Primarily United States and United KingdomPrimarily Insurance Brokerage and Other ServicesUSD 294 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Cumulative plan total of $294M across 2000-2002 ($82M in 2000, $218M in 2001, $6M credit in 2002). Approximately 3,700 employees notified for termination; net reduction of ~2,800 after ~900 new hires. 198 notified employees outside the U.S. remained as of year-end due to local notice requirements. Plan completed in 2002.
2002-12-31restructuringcompleted2002-10-312002-12-31United StatesCorporate and Insurance UnderwritingUSD 50 (millions)MD&A
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Approximately $50M pretax expenses in 2002 related to abandoned plan to divest underwriting businesses, including staff buildup and severance costs ($33M in Insurance Underwriting segment, $17M in Corporate and Other). Employee count not disclosed.
2002-12-31divestiture_reductioncompleted2002-10-312003-03-31United StatesInsurance Underwriting — Sheffield Insurance Corporationsubsequent_events
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of Sheffield Insurance Corporation announced Q4 2002, completed March 2003. Employee count not disclosed.
2002-12-31restructuringannounced2003-02-01Mexico, Argentina, Brazil, and United StatesInsurance Underwriting — accident and health underwriting and large company group lifesubsequent_events
f5-10k / MiMo-V2.6-Flash-fp8-HTML		February 2003 announcement to discontinue A&H underwriting in Mexico, Argentina, Brazil and large company group life business in the U.S. Total 2002 earned premiums for these lines were approximately $100M. Employee count not disclosed.
2002-12-31restructuringcompleted3,7002000-10-012002-12-31GlobalInsurance Brokerage and Other ServicesUSD 294 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		Business transformation plan initiated in Q4 2000 and completed in 2002. Total pretax expense of $294 million. Approximately 3,700 employees terminated (gross basis). Net reduction expected to be approximately 2,800 after 900 new hires. In 2002, a $6 million credit was recorded due to reduced terminations in U.S. retail brokerage following the World Trade Center tragedy.
2002-09-30restructuringin_progress3,9002000-10-01United States, United Kingdom, InternationalPrimarily Insurance Brokerage and Other ServicesUSD 294 (millions)MD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Cumulative plan total: 3,900 employees notified for termination (750 in 2000, 3,150 in 2001). More than 3,050 removed from payroll by Dec 31, 2001. Company states no additional one-time expenses anticipated. Includes $6M credit in 2002.
2002-09-30restructuringannounced2002-10-312002-12-31United StatesCorporate and Insurance Underwritingsubsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		On Oct 31, 2002 Aon announced it would not sell or spin off underwriting subsidiaries. Q4 2002 will include costs to wind down expanded corporate and underwriting staff added for the planned spin-off. No headcount or charge quantified.
2002-09-30restructuringin_progress2002000-10-01United StatesInsurance Brokerage and Other ServicesMD&A
f5-10q / Qwen3.6-27B-Q8_0		Approximately 200 U.S. retail brokerage employees whose jobs were to be terminated experienced unforeseeable delays due to September 11 events, ultimately reducing the total number of terminations.
2002-09-30restructuringin_progress3,9002000-10-01GlobalInsurance Brokerage and Other ServicesUSD 157 (millions)MD&A
f5-10q / Qwen3.6-27B-Q8_0		Total gross employee reduction level tied to termination benefit charges. Includes 750 employees in 2000 and 3,150 in 2001. Most terminations occurred; run-off trails completion due to ratable severance payments.
2002-06-30restructuringin_progress3,9002000United States, United KingdomInsurance Brokerage and Other ServicesUSD 294 (millions)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Cumulative program since Q4 2000; 750 notified in 2000, 3,150 in 2001. In Q2 2002 a $6M credit reversed previously accrued termination benefits for ~200 U.S. retail employees whose positions were retained. Company states it does not anticipate additional plan expenses.
2002-06-30divestiture_reductionannounced2001-04United StatesInsurance UnderwritingMD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Board approved spin-off of underwriting businesses (Combined Specialty) in April 2001; in Q2 2002 Aon is evaluating sale and/or partial spin-off due to unfavorable market conditions. No headcount figure disclosed. $3M divestiture expenses in Q2 2002, $8M YTD.
2002-06-30restructuringin_progress2000-Q4United StatesInsurance Brokerage and Other ServicesUSD -6 (millions)MD&A
f5-10q / Qwen3.6-27B-Q8_0		Credit of $6 million for reversal of termination benefits previously incurred. Related to decision that certain employees targeted for termination would remain employed.
2002-06-30restructuringin_progress2000-Q4GlobalCorporateUSD 22 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Cash payments of $22 million made in first six months of 2002 related to business transformation plan.
2002-03-31restructuringin_progress4,0002000-10-012002-12-31Primarily United States and United KingdomPrimarily Insurance Brokerage and Other ServicesUSD 300 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Cumulative figure since plan inception in Q4 2000; employees departed voluntarily or positions eliminated. Plan continues into 2002. $9M cash payments in Q1 2002; remaining liability $70M at quarter-end.
2002-03-31divestiture_reductionannounced2001-04-202002-06-30United StatesInsurance Underwritingother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Spin-off of underwriting businesses to Combined Specialty Group, Inc. as tax-free stock dividend; expected completion Q2 2002. No employee count disclosed. $5M spin-off expenses incurred in Q1 2002.
2002-03-31restructuringin_progress2000-Q42002-06-30WorldwideInsurance Brokerage and Other ServicesUSD 9 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Q1 2002 payments of $9M related to termination benefits and exit costs. Total program previously announced in Q4 2000 affected approx 4,000 employees cumulatively; specific Q1 headcount impact not disclosed.
2002-03-31restructuringin_progress1996WorldwideInsurance Brokerage and Other ServicesUSD 2 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Q1 2002 payments of $2M on restructuring charges and purchase accounting liabilities from Alexander & Alexander acquisition. Remaining liability $55M.
2001-12-31restructuringin_progress4,0002000-112002-12-31United States and United KingdomInsurance Brokerage and Other ServicesUSD 218 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Cumulative through fiscal year-end: approximately 4,000 employees departed voluntarily or had positions eliminated since program inception in Q4 2000. 2001 pretax special charge of $218M includes termination benefits, exit costs, and asset impairments. Program expected to continue into 2002; net reductions estimated at approximately 3,000 positions through 2002.
2001-12-31divestiture_reductionannounced2001-04-202002-06-30GlobalInsurance UnderwritingItem_1_Business
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Planned tax-free spin-off of insurance underwriting businesses to Combined Specialty Corporation. Board approved in principle April 2001; subject to final Board approval, favorable IRS ruling, and insurance regulatory approvals. Expected completion spring 2002. No employee count disclosed for the spin-off.
2001-12-31restructuringin_progress3,1502000-11-01United States and United KingdomInsurance Brokerage and Other ServicesUSD 109 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		FY2001 activity only: termination benefits of $109 million covering notification to 3,150 employees. Program announced November 2000; cumulative notifications of approximately 3,900 employees (750 in 2000, 3,150 in 2001), of which more than 3,050 had been removed from payroll by 2001-12-31. Total plan pretax expense of $300 million ($82M in 2000, $218M in 2001) includes non-severance items; filer states it does not anticipate additional expenses from the plan.
2001-12-31acquisition_additioncompletedUnited StatesConsulting; Insurance Underwritingbusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		2001 acquisitions of ASI Solutions Incorporated (human resource outsourcing and compensation consulting) and First Extended, Inc. (automotive extended warranty), plus certain other brokerage and consulting operations, for approximately $107 million cash and $197 million common stock. Headcount added through these acquisitions is not disclosed.
2001-12-31restructuringcompleted2001-03-31United StatesInsurance Underwriting — supplemental accident and health (Mississippi)USD 14 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Provision recorded in 2001 for discontinuing supplemental accident and health insurance operations in Mississippi; includes severance, agent reassignment costs and estimated claim/suit resolution. Affected employee and agent counts not disclosed.
2001-12-31divestiture_reductionannounced2001-04-202002-06-30United States, Canada, Latin America, Europe, Asia/PacificInsurance UnderwritingItem_1_Business
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Board approved in principle a tax-free spin-off of underwriting businesses into Combined Specialty Group, Inc., originally expected spring 2002. On 2002-08-07 (subsequent event) Aon announced it is investigating alternative options including sale of all or part of Combined Specialty. No headcount impact disclosed.
2001-12-31otherin_progress2001-03-31United StatesInsurance Brokerage and Other Services — auto finance servicing and joint venturesUSD 56 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		FY2001 charges to cease new auto financing servicing business ($44 million) and to exit four joint venture operations ($12 million). Headcount reductions associated with these exits are not disclosed.
2001-12-31restructuringcompleted3,9002000-11-012001-12-31GlobalInsurance Brokerage and Other Services; ConsultingUSD 300 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Business transformation plan announced Nov 2000. Total net expenses of $300 million ($82M in 2000, $218M in 2001). Charges included termination benefits for 3,900 employees (750 in 2000, 3,150 in 2001). More than 3,050 removed from payroll by Dec 31, 2001.
2001-09-30restructuringin_progress4,0002000-112002Primarily United States and United KingdomInsurance Brokerage and Other ServicesUSD 218 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Footnote states approximately 4,000 employees notified their positions were or will be eliminated; MD&A reports net reductions of about 3,000 positions after new hires, and year-to-date 2001 termination-benefit charges covering about 3,200 employees ($108M). Total plan costs expected to exceed the originally projected $325M pretax upper range; annualized pretax savings of $150M-$200M targeted for 2002.
2001-09-30otherin_progress1762001-09-11United StatesInsurance brokerage, human resource consulting, claims servicing, specialty operations, and accident/health/life underwritingUSD 53 (millions)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		176 Aon employees missing and presumed dead or confirmed deceased following destruction of the World Trade Center. $53M pretax charge ($32M after-tax, $0.12 per diluted share) recorded in Q3 2001, net of estimated insurance recoveries of $198M; further costs and recoveries expected in Q4 2001 and potentially 2002.
2001-09-30acquisition_additioncompleted2001-07-24United StatesExtended warranty (First Extended, Inc.)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Merger completed July 24, 2001; consideration was 2,000,000 shares of Aon common stock. Headcount added through the acquisition is not disclosed in this filing.
2001-09-30divestiture_reductionannounced2001-04-202002GlobalInsurance Underwriting (Combined Specialty Corporation)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Board approved in principle a tax-free spin-off of the underwriting business, expected by Spring 2002, subject to final Board approval, a favorable IRS ruling and regulatory approvals. No affected-employee count disclosed.
2001-09-30restructuringin_progress4,0002000-11-012002-12-31United States and United KingdomInsurance Brokerage and Other ServicesUSD 218 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Approximately 4,000 employees notified of position elimination under business transformation plan. Most have departed. YTD 2001 charges of $218 million include $109 million for termination benefits.
2001-09-30othercompleted1762001-09-112001-09-11United StatesMultiple (Brokerage, Consulting, Underwriting)USD 53 (millions)other
f5-10q / Qwen3.6-27B-Q8_0		176 employees missing and presumed dead or confirmed deceased in World Trade Center attack. Pretax charge of $53 million recorded.
2001-06-30restructuringin_progress4,0002000-11-012002-12-31Primarily United States and United KingdomPrimarily Insurance Brokerage and Other ServicesUSD 325 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Cumulative figure: nearly 4,000 employees notified of position elimination since plan inception in Q4 2000; over half had departed by filing. Net position reductions of approximately 3,000. Within 2001: about 2,000 employees notified in Q2 2001 (termination-benefit charge of $85M) and about 3,200 notified year-to-date (YTD charge $108M). Total pretax plan costs expected to be less than $325M; annualized pretax savings estimated at $150M-$200M. Filer states positions eliminated are not folded into a disclosed turnover rate.
2001-06-30divestiture_reductionannounced2001-04-20Not disclosedInsurance Underwriting segmentother
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Board approved in principle a tax-free spin-off of the underwriting business into a separate public company; subject to final Board approval, IRS ruling and regulatory approvals. No headcount impact disclosed.
2001-06-30acquisition_additioncompleted2001-02-012001-05-09Not disclosedConsulting segment (human resources administration and compensation consulting)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Stock-for-stock acquisition completed May 9, 2001, accounted for as a purchase. No employee headcount added disclosed.
2001-06-30acquisition_additioncompleted2001-05-012001-07-24Not disclosedExtended contract products administrationsubsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Completed July 24, 2001 (after quarter end) in exchange for approximately 2 million Aon shares. No employee headcount added disclosed.
2001-06-30restructuringin_progress2,0002000-11-012002-12-31United States and United KingdomInsurance Brokerage and Other ServicesUSD 85 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Second quarter 2001 charges included $85 million for termination benefits related to notification of approximately 2,000 employees. Plan expected to continue through 2002.
2001-06-30restructuringin_progress3,2002000-11-012002-12-31GlobalCorporate and Operating SegmentsUSD 108 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Year-to-date 2001 charges included $108 million for termination benefits related to approximately 3,200 employees. Nearly 4,000 employees notified since plan inception in Q4 2000.
2001-06-30acquisition_additioncompleted2001-02-012001-05-09WorldwideConsultingbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of ASI Solutions Incorporated completed May 9, 2001. Headcount not disclosed.
2001-06-30acquisition_additioncompleted2001-05-012001-07-24United StatesInsurance Underwritingbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of First Extended, Inc. completed July 24, 2001. Headcount not disclosed.
2001-03-31restructuringin_progress1,2002000-112001-06-30United States and United Kingdom (majority)Insurance Brokerage and Other ServicesUSD 23 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Q1 2001 special charge of $72M total: $23M termination benefits (approx. 1,200 employees notified in the quarter), $38M to exit joint ventures/service partner relationships, $11M asset impairments. Cumulative notifications since plan start approx. 2,000 employees, described as about 6% of worldwide workforce at announcement. Remaining special charges expected by end of Q2 2001; full run-rate savings of $150M-$200M targeted Q4 2001. Termination benefits liability balance $45M at 2001-03-31.
2001-03-31divestiture_reductionannounced2001-04-20Insurance Underwritingsubsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Board approved in principle a tax-free spin-off of underwriting businesses into Combined Specialty Corporation, pending favorable IRS ruling, final Board approval and insurance regulatory approvals. No headcount disclosed.
2001-03-31acquisition_additioncompleted2001-022001-05-09Consultingbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of ASI Solutions Incorporated, a human resources administration and compensation consulting provider, completed 2001-05-09 and financed with approximately 3.1 million common shares; accounted for as a purchase. No employee count disclosed.
2001-03-31restructuringin_progress2,0006%2000-11-01WorldwideInsurance Brokerage and Other ServicesUSD 72 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Approximately 2,000 employees notified since plan inception (Q4 2000). Majority in Insurance Brokerage segment in U.S. and U.K. Q1 2001 charge includes $23M termination benefits, $3M exit costs, $46M asset impairments.
2001-03-31acquisition_additionannounced2001-02-012001-05-09WorldwideConsultingbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of ASI Solutions Incorporated announced Feb 2001, completed May 9, 2001. Headcount not disclosed.
2000-12-31restructuringin_progress5002000-11-022001-12-31United States and United KingdomInsurance Brokerage and Other ServicesUSD 82 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		First phase eliminated approximately 500 positions in Q4 2000. Full program targets elimination of about 3,000 positions (~6% of 51,000 workforce) through 2001; pretax special charges of $82M recorded in Q4 2000, with total plan costs of $250M–$325M expected.
2000-12-31restructuringin_progress3,0006%2000-11-022001-12-31United States and United KingdomAll segments, primarily Insurance Brokerage and Other ServicesUSD 250 (millions)MD&A
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Full multi-year program targeting elimination of about 3,000 positions (~6% of 51,000 total workforce). Total pretax costs estimated at $250M–$325M; $82M charged in Q4 2000 with remaining charges expected in first half of 2001. Annualized pretax savings of $150M–$200M expected by Q4 2001.
2000-12-31acquisition_additioncompleted2000-10-022000-10-02United StatesConsultingbusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Actuarial Sciences Associates, Inc. (ASA) completed October 2000; 3,864,824 Aon shares issued. Headcount added not separately disclosed.
2000-12-31acquisition_additioncompletedUnited StatesInsurance Brokerage and Other Servicesbusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Horizon Consulting Group, Inc. acquired in 2000 along with other brokerage and consulting operations; aggregate consideration ~$85M cash and $145M stock. Headcount added not disclosed.
2000-12-31otherannounced2001-02-01GlobalConsultingItem_1_Business
f5-10k / MiMo-V2.6-Flash-fp8-HTML		In February 2001 (after fiscal year-end), Aon announced a definitive agreement to acquire ASI Solutions Incorporated, a human resources administration and compensation consulting firm, subject to regulatory and shareholder approval. Headcount impact not disclosed.
2000-12-31restructuringin_progress3,0006%2000-11-022001-12-31United States and United KingdomInsurance Brokerage and Other ServicesUSD 250 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Business transformation plan announced Nov 2, 2000. Total pretax costs expected between $250M and $325M. Elimination of about 3,000 positions (approx 6% of workforce). First phase eliminated approx 500 positions in Q4 2000 with $82M pretax charge. Remaining charges expected in first half of 2001.
2000-09-30restructuringannounced3,0006%2000-112001-12-31Worldwide (majority of charges and savings in United States and United Kingdom)Majority in Insurance Brokerage and Other Services; positions at all levels including senior and middle management, corporate staff, administrative and clericalUSD 288 (millions)MD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Board approved plan in principle in November 2000; charge disclosed as a range of $250 million to $325 million pretax (midpoint shown), majority recorded as restructuring charge beginning Q4 2000. Severance for elimination of approximately 3,000 positions, stated as 6% of the workforce. Annualized pretax savings estimated at $150 million to $200 million, majority realized beginning Q4 2001. Announcement date known only to month.
2000-09-30acquisition_additionannounced2000-10Employee benefits and compensation consultingsubsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Aon acquired ASA Acquisition Corp. in October 2000, financed by issuance of 3.9 million common shares and accounted for as a purchase. No headcount added disclosed. Announcement date known only to month.
2000-09-30restructuringannounced3,0006%2000-11-012001-06-30WorldwideInsurance Brokerage and Other Services; Corporate staff functions; Administrative and clericalUSD 288 (millions)subsequent_events
f5-10q / Qwen3.6-27B-Q8_0		Board approved plan in Nov 2000. Total costs estimated $250M-$325M pretax. Majority of charges expected in Q4 2000 and Q1 2001, remainder in Q2 2001. Includes severance for ~3,000 positions (6% of workforce).
2000-03-31restructuringin_progress1999-03-31GlobalInsurance Brokerage and Other Services; ConsultingUSD 8 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Payments of $8 million made in Q1 2000 on restructuring charges and purchase accounting liabilities relating to business combinations. Includes termination benefits and lease abandonments from 1999 and prior years.
2000-03-31acquisition_additioncompleted2000-03-31GlobalInsurance Brokerage and Other ServicesUSD 35 (millions)business_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Cash used for acquisition activity was $35 million, primarily reflecting brokerage acquisitions. Headcount added is not explicitly disclosed.
1999-12-31restructuringin_progress9001999-03-312000-12-31United States, Canada, United Kingdom and EuropeInsurance Brokerage and Other Services; ConsultingUSD 120 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Charge comprises $67M termination benefits, $32M related pension expense, and $21M lease abandonments ($11M) and asset impairments ($10M). 860 terminations occurred in 1999; 40 planned for 2000. Reductions tied to a voluntary early retirement plan for U.S. and Canadian subsidiaries and consolidation of European brokerage operations, primarily in the U.K. Termination-benefit liability of $16M and lease-abandonment liability of $5M remained at year-end 1999; management expected all termination benefits settled in 2000.
1999-12-31acquisition_additioncompletedItaly, France, United StatesInsurance Brokerage and Other Servicesbusiness_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Purchase price approximately $395M cash and $45M stock, plus $50M for insurance underwriting blocks of business. Headcount added through these acquisitions is not disclosed.
1999-12-31restructuringcompleted9001999-03-312000-12-31United States, Canada, United KingdomInsurance Brokerage and Other Services, ConsultingUSD 120 (millions)restructuring_footnote
f5-10k / Qwen3.6-27B-Q8_0		Plan of restructuring operations due to business combination activity. 860 terminations occurred in 1999; 40 planned for 2000. Includes voluntary early retirement plan for US/Canada and consolidation of European brokerage operations.
1999-09-30restructuringin_progress9001999-03-312000-03-31United States, Canada, United Kingdom / EuropeInsurance Brokerage and Other Services; ConsultingUSD 99 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Consolidated program announced in Q1 1999 covering a voluntary early retirement plan for U.S. and Canadian subsidiaries and consolidation of European brokerage operations (primarily UK). Total special charges were $163M pretax ($102M after tax); $99M relates to severance and pension for 900 positions. Approximately 870 employees terminated as of 1999-09-30 with ~$65M paid; remaining terminations expected by Q1 2000. Of the $99M, ~$32M represents pension benefits included in total pension liability. Announcement date approximated to end of Q1 1999 as filing states only 'first quarter 1999'.
1999-09-30restructuringin_progress1999-03-312001-01-01United KingdomConsultingUSD 43 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Charge for redress payments to U.K. customers who purchased private pension plans; not a headcount reduction. ~$8M paid as of 1999-09-30; remaining amounts anticipated to be paid primarily by early 2001. Included in the $163M total special charges.
1999-09-30restructuringin_progress1999-03-312000-03-31GlobalInsurance Brokerage and Other ServicesUSD 21 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Lease abandonments and other exit activities related to consolidation of worldwide brokerage operations. No employee count separately disclosed for this component. Included in the $163M total special charges.
1999-09-30restructuringin_progress9001999-03-312000-03-31United States, Canada, United KingdomInsurance Brokerage and Other Services, ConsultingUSD 99 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Includes voluntary early retirement plan for U.S. and Canadian subsidiaries and consolidation of European operations. Approximately 870 employees terminated as of Sept 30, 1999.
1999-09-30acquisition_additioncompleted1999-07-011999-07-31ItalyInsurance Brokerage and Other Servicesbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of Nikols Sedgwick, a leading Italian insurance and reinsurance broker. Headcount not disclosed.
1999-06-30voluntary_separationin_progress9002000-03-31United States, Canada, United KingdomInsurance Brokerage and Other ServicesUSD 99 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		First quarter 1999 program: voluntary early retirement for U.S./Canadian subsidiaries plus consolidation of European brokerage operations, primarily in the U.K.; part of $163M pretax special charges. About $40M paid for roughly 800 terminations by June 30, 1999; remaining payments and terminations due by first quarter 2000. Includes ~$32M of pension-related benefits within total pension liability.
1999-06-30restructuringin_progress9001999-03-312000-03-31United States, Canada, United KingdomInsurance Brokerage and Other Services, ConsultingUSD 99 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Includes voluntary early retirement plan for U.S. and Canadian subsidiaries and consolidation of European operations. Remaining payments expected by first quarter 2000.
1999-06-30otherin_progress1999-03-312001-01-01United KingdomConsultingUSD 43 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Redress payments to customers for private pension plan misselling. Not a workforce reduction.
1999-06-30restructuringin_progress1999-03-31WorldwideInsurance Brokerage and Other ServicesUSD 21 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Lease abandonments relating to consolidation of worldwide brokerage operations and other exit activities.
1999-03-31restructuringin_progress900United States, Canada, United Kingdom (Europe)Insurance Brokerage and Other Services (European consolidation); U.S. and Canadian operating subsidiariesUSD 99 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Consolidated program disclosed as a single total: severance and related pension expenses for 900 positions. Driven by a voluntary early retirement plan for U.S./Canadian subsidiaries and consolidation of European brokerage operations. About $32M of the $99M is pension-plan benefits recorded in total pension liability. As of 1999-03-31, ~$20M paid for 650 terminated employees; remaining terminations and payments expected within one year. Total special charge was $163M pretax ($102M after tax), of which $43M relates to U.K. pension-misselling customer redress (not workforce) and $21M to lease abandonments (not workforce).
1999-03-31voluntary_separationin_progress9001999-03-312000-03-31United States, Canada, United KingdomInsurance Brokerage and Other Services, ConsultingUSD 99 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Voluntary early retirement plan for U.S. and Canadian subsidiaries and consolidation of European operations. 650 employees terminated as of March 31, 1999; remaining payments expected within one year.
1998-12-31acquisition_additioncompletedFrance, Spain, United StatesInsurance Brokerage and Other ServicesUSD 70 (millions)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		1998 acquisitions of Le Blanc de Nicolay, Gil y Carvajal, and AIS for ~$400M; ~$70M purchase accounting liabilities established for severance and real estate consolidation; ~$50M unpaid at year-end. No employee headcount disclosed for acquired entities.
1998-12-31restructuringannounced1999-03-31Europe; United States; CanadaInternational operations; corporateUSD 125 (millions)MD&A
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Q1 1999 announced potential restructuring plans: European workforce reductions, facility closures/consolidations, and voluntary early retirement for US/Canada employees. Expected pretax charge range $100–150M; midpoint shown. No headcount disclosed.
1998-12-31restructuringannounced1999-03-19International and U.S./CanadaInternational operations and U.S./Canadian operating subsidiariesUSD 125 (millions)subsequent_events
f5-10k / Qwen3.6-27B-Q8_0		Announced in Q1 1999. Includes European workforce reductions, facility closures, and voluntary early retirement plan for U.S. and Canadian employees. Pretax special charge estimated at $100-$150 million.
1998-12-31acquisition_additioncompleted1998-12-31GlobalBrokerage and ConsultingMD&A
f5-10k / Qwen3.6-27B-Q8_0		1998 acquisitions included Auto Insurance Specialists, Le Blanc de Nicolay, and Gil y Carvajal. Specific headcount added not disclosed.
1998-09-30acquisition_additioncompletedUnited StatesInsurance brokeragebusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Third quarter 1998 merger with Auto Insurance Specialists (AIS), an automobile insurance brokerage; accounted for as a pooling of interests and financed by reissuing about 1.3 million treasury shares. Headcount added not disclosed.
1998-09-30acquisition_additioncompletedFranceReinsurance brokeragebusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Le Blanc de Nicolay, described as the largest reinsurance broker in France, during nine months 1998 (purchase method); exact transaction date not disclosed. Headcount added not disclosed.
1998-09-30acquisition_additioncompletedSpainRetail and reinsurance brokeragebusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Gil y Carvajal, described as the largest retail and reinsurance broker in Spain, during nine months 1998 (purchase method); exact transaction date not disclosed. Headcount added not disclosed.
1998-09-30restructuringcompleted1997-03-31GlobalInsurance BrokerageUSD 145 (millions)MD&A
f5-10q / Qwen3.6-27B-Q8_0		1997 special charges related to restructuring of brokerage operations following A&A acquisition, including severance and consolidation costs. No specific employee count disclosed.
1998-09-30acquisition_additioncompleted1998-09-30United StatesInsurance Brokeragebusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Merger with Auto Insurance Specialists (AIS) in Q3 1998. Headcount not disclosed.
1998-09-30acquisition_additioncompleted1998-06-30FranceInsurance Brokeragebusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of Le Blanc de Nicolay in Q2 1998. Headcount not disclosed.
1998-09-30acquisition_additioncompleted1998-03-31SpainInsurance Brokeragebusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of Gil y Carvajal in Q1 1998. Headcount not disclosed.
1998-06-30restructuringcompleted1997-01-01Insurance brokerageUSD 145 (millions)MD&A
f5-10q / Qwen3.6-27B-Q8_0		1997 special charges related to restructuring of brokerage operations following A&A acquisition; liabilities reduced as planned in H1 1998.
1998-06-30acquisition_additioncompleted1998-03-31SpainInsurance brokeragebusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of Gil y Carvajal in first quarter 1998.
1998-06-30acquisition_additioncompleted1998-06-30FranceInsurance brokeragebusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of Le Blanc de Nicolay in second quarter 1998.
1998-03-31acquisition_additioncompletedSpainInsurance brokerage and consulting servicesbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Purchase-method acquisition of Gil y Carvajal, described as Spain's largest retail and reinsurance broker; no employee count disclosed and effect stated as not material
1998-03-31acquisition_additionannounced1998-04-30FranceInsurance brokerage and consulting servicesbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		April 1998 acquisition of LeBlanc de Nicolay, described as France's largest reinsurance broker, subject to regulatory approval; no employee count disclosed; announcement date is month-only (1998-04)
1998-03-31restructuringcompleted1997-03-31Insurance brokerage operationsUSD 145 (millions)MD&A
f5-10q / Qwen3.6-27B-Q8_0		Special charges related to restructuring of brokerage operations following acquisition of Alexander & Alexander Services Inc. in 1997. Includes severance and real estate consolidation costs.
1998-03-31acquisition_additioncompleted1998-03-31SpainInsurance brokerageUSD 96 (millions)business_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of Gil y Carvajal, largest retail and reinsurance broker in Spain. Cash used for acquisition was $96.1 million.
1997-12-31restructuringin_progress6001997-03-31GlobalInsurance brokerage and consulting servicesUSD 40 (millions)MD&A
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Q1 1997 restructuring plan following A&A acquisition; severance for over 600 positions; total pretax special charge $145M including ~$105M real estate consolidation; terminations substantially complete by year-end
1997-12-31acquisition_additioncompleted2,0001997-01-01GlobalInsurance brokerage and consulting servicesUSD 200 (millions)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		A&A acquisition purchase accounting established ~$200M liabilities for severance (~2,000 positions) and real estate consolidation; ~$100M remained unpaid at year-end
1997-12-31acquisition_additioncompleted1997-01-01GlobalInsurance brokerage and consulting servicesUSD 1,600 (millions)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		1997 acquisitions of A&A, Minet, Jauch & Hubener and others totaling ~$1.6B purchase price; headcount added not separately disclosed
1997-12-31restructuringcompleted6001997-03-311997-12-31GlobalInsurance Brokerage and ConsultingUSD 40 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		First quarter 1997 special charges included severance for over 600 positions. Terminations substantially complete.
1997-12-31restructuringin_progress2,0001997-01-01GlobalInsurance Brokerage and ConsultingMD&A
f5-10k / Qwen3.6-27B-Q8_0		Approximately $200 million purchase accounting liabilities established for A&A acquisition, primarily relating to severance for approximately 2,000 positions.
1997-12-31voluntary_separationcompleted4501996-06-301996-12-31United States and EuropeAll SegmentsMD&A
f5-10k / Qwen3.6-27B-Q8_0		Second quarter 1996 voluntary early retirement program. Approximately 450 employees participated.
1997-12-31restructuringcompleted3001996-12-311997-12-31EuropeInsurance BrokerageUSD 12 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Fourth quarter 1996 restructuring of European brokerage operations (Bain Hogg acquisition). Workforce reductions involving approximately 300 positions took place within one year.
1997-09-30restructuringin_progress1997-03-311998-01-01GlobalInsurance Brokerage and Consulting ServicesUSD 145 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Pretax charge of $145M ($90.6M after-tax) for restructuring brokerage operations following A&A acquisition. Includes ~$105M real estate consolidation and ~$40M severance. No employee count disclosed. ~$90M unpaid at quarter-end; real estate payments expected over several years.
1997-09-30acquisition_additioncompleted1997-01-011997-01-01GlobalInsurance Brokerage and Consulting Servicesbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		A&A acquisition completed early 1997 for ~$1.2B; results consolidated since 1997-01-01. No headcount added disclosed. Preliminary purchase accounting liabilities of ~$200M include severance and related costs.
1997-09-30acquisition_additioncompleted1997-07-011997-09-30GlobalInsurance Brokerage and Consulting Servicesbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		The Minet Group acquired in Q3 1997 by Aon insurance brokerage subsidiaries; purchase method. Filing states effect was not material to consolidated statements. No headcount added disclosed.
1997-09-30restructuringin_progress1997-03-311998-09-30WorldwideInsurance brokerage and consulting servicesUSD 145 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Pretax special charges of $145 million recorded in Q1 1997 related to restructuring brokerage operations following A&A acquisition. Includes $105 million for real estate consolidation and $40 million for severance. Terminations planned within one year of acquisition.
1997-09-30acquisition_additioncompleted1997-01-011997-01-01WorldwideInsurance brokerage and consulting servicesbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of Alexander & Alexander Services Inc. (A&A) completed in early 1997 for approximately $1.2 billion. Results included since January 1, 1997.
1997-09-30acquisition_additioncompleted1997-09-301997-09-30WorldwideInsurance brokerage and consulting servicesbusiness_combinations_footnote
f5-10q / Qwen3.6-27B-Q8_0		Acquisition of The Minet Group (Minet) by certain insurance brokerage subsidiaries in Q3 1997. Effect not material to consolidated financial statements.
1997-06-30restructuringin_progressWorldwide (various offices)Insurance brokerage and consulting services — real estate / facilitiesUSD 105 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Pretax real estate component of the $145M Q1 1997 restructuring charge: office closures, abandonment and downsizing; payable over several years. No employee count attached to this sub-component.
1997-06-30reduction_in_forcein_progress6001998-06-30WorldwideInsurance brokerage and consulting servicesUSD 40 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Severance and related costs for over 600 positions within the $145M Q1 1997 restructuring charge; terminations planned within one year. Filer states 'over 600 positions'.
1997-06-30reduction_in_forceannounced2,0001998-06-30WorldwideInsurance brokerage and consulting services (A&A integration)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Approximately 2,000 additional planned terminations within one year; severance costs included in preliminary purchase accounting liabilities (~$200M) recorded at 1997-06-30, not yet paid. No separate charge amount disclosed for this tranche.
1997-06-30acquisition_additioncompletedUnited States / InternationalInsurance brokerage and consulting servicesUSD 1,200 (millions)business_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Alexander & Alexander Services, Inc. completed Q1 1997 for ~$1.2B; results consolidated from 1997-01-01. Headcount added through the acquisition is not disclosed. Charge value shown is the purchase price, not a workforce charge.
1997-06-30restructuringin_progress6001997-03-311998-06-30WorldwideInsurance brokerage and consulting servicesUSD 40 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Severance and related costs for over 600 positions; terminations planned within one year.
1997-06-30restructuringin_progress2,0001997-03-311998-06-30WorldwideInsurance brokerage and consulting servicesrestructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Approximately 2,000 additional terminations planned within one year; costs included in preliminary purchase accounting liabilities.
1997-06-30restructuringin_progress1997-03-31WorldwideInsurance brokerage and consulting servicesUSD 105 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Real estate activities including closure, abandonment, and downsizing of various offices; expected to be paid out over several years.
1997-03-31restructuringin_progress2,6001997-03-311997-12-31GlobalInsurance brokerage and consulting servicesUSD 40 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Severance and related costs for over 2,600 positions; terminations planned within one year of Q1 1997. Part of $145 million pretax special charges ($90.6 million after-tax). Announcement date not specified; recorded during Q1 1997.
1997-03-31restructuringin_progress1997-03-31GlobalInsurance brokerage and consulting services — real estateUSD 105 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Real estate consolidation component of the same $145 million special charge: closure, abandonment and downsizing of office space globally following the A&A acquisition; payments expected over several years. No employee count disclosed for this sub-component.
1997-03-31acquisition_additioncompleted1997-03-31GlobalInsurance brokerage and consulting servicesbusiness_combinations_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Alexander & Alexander Services Inc. for approximately $1.2 billion, completed in Q1 1997 with results included from January 1, 1997. Headcount added through the acquisition is not disclosed. Related preliminary purchase accounting liabilities of approximately $200 million include severance and related costs.
1997-03-31restructuringin_progress2,6001997-03-311998-03-31GlobalInsurance brokerage and consulting servicesUSD 40 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Severance and related costs for over 2,600 positions; terminations planned within one year.
1997-03-31restructuringin_progress1997-03-31GlobalInsurance brokerage and consulting servicesUSD 105 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Real estate activities including closure, abandonment, and downsizing of office space following A&A acquisition; expected payout over several years.
1996-12-31voluntary_separationcompleted4501996-06-30United States and parts of EuropeAll eligible employees of U.S. operating subsidiaries and similar programs in parts of EuropeUSD 30 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Voluntary early retirement program recorded in second quarter 1996; approximately 60% of participants were in the U.S.; $19 million after tax ($0.18 per share)
1996-12-31restructuringin_progress3001996-12-311997-12-31EuropeInsurance brokerage and consulting services (European brokerage operations)USD 12 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Fourth quarter 1996 formal restructuring plan for European brokerage operations; workforce reduction component of $60 million total pretax special charges ($40 million after tax); terminations planned within one year
1996-12-31restructuringin_progress1996-12-31EuropeInsurance brokerage and consulting services (real estate and data processing consolidation)USD 32 (millions)restructuring_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Consolidating real estate space and data processing facilities/equipment, primarily in Europe, to merge existing operations with Bain Hogg; charges expected to be paid out over several years
1996-12-31acquisition_additioncompleted1996-10-011996-10-31United Kingdom and AsiaInsurance brokerage and consulting servicesUSD 260 (millions)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Bain Hogg Group plc for approximately $260 million, financed by internal funds; headcount added not disclosed
1996-12-31acquisition_additioncompleted1996-12-111997-03-31GlobalInsurance brokerage and consulting servicesUSD 1,200 (millions)business_combinations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Alexander & Alexander Services Inc. merger completed in early 1997 for approximately $1.2 billion; purchase accounting will result in significant increase in intangible assets; headcount added not disclosed
1996-12-31divestiture_reductioncompleted1996-04-011996-04-01United StatesInsurance underwriting (discontinued operations)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of Union Fidelity Life Insurance Company and The Life Insurance Company of Virginia to General Electric Capital Corporation; after-tax proceeds approximately $1.2 billion; headcount removed not disclosed
1996-12-31divestiture_reductioncompleted1996-06-301996-06-30North AmericaInsurance underwriting (auto credit underwriting and distribution)Item_1_Business
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of North American auto credit underwriting and distribution operations including auto extended warranty distribution; headcount removed not disclosed
1996-12-31restructuringannounced1997-03-31GlobalInsurance brokerage operationssubsequent_events
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Management anticipated committing to a restructuring plan primarily related to brokerage operations in first quarter 1997 following completion of the A&A acquisition; no charge quantified
1996-12-31voluntary_separationcompleted4501996-06-301996-06-30United States and EuropeAll eligible employees of operating subsidiariesUSD 30 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Voluntary early retirement program in second quarter 1996. Approximately 450 employees participated, 60% in the U.S. Pretax charge of $30 million.
1996-12-31restructuringcompleted3001996-12-311997-12-31EuropeBrokerage operationsUSD 12 (millions)MD&A
f5-10k / Qwen3.6-27B-Q8_0		Workforce reductions of approximately 300 positions in European brokerage operations in fourth quarter 1996. Terminations planned within one year. Pretax charge of $12 million for severance.
1996-09-30voluntary_separationcompleted1996-04-01United States; internationalCorporate and other; Insurance brokerage and consulting services; Insurance underwritingUSD 30 (millions)MD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Voluntary early retirement program introduced domestically in Q2 1996 with similar programs internationally; pretax special charges of $30.2M recorded in nine months 1996, split $22.4M brokerage, $6.4M underwriting, $1.4M corporate. Number of participants not disclosed.
1996-09-30divestiture_reductioncompleted1995-12-311996-04-01United StatesInsurance underwriting (discontinued operations)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale of Union Fidelity Life Insurance Company and The Life Insurance Company of Virginia completed April 1, 1996; after-tax proceeds ~$1.2 billion. Headcount removed not disclosed.
1996-09-30divestiture_reductioncompleted1996-06-30North AmericaInsurance underwriting — auto credit underwriting and distributionMD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale of North American auto credit underwriting and distribution operations completed June 30, 1996; extended warranty products continue to be underwritten by Virginia Surety Company. Headcount removed not disclosed.
1996-09-30acquisition_additionannounced1996-10-181996-10-18International (United Kingdom)Insurance brokerage and consulting servicesUSD 250 (millions)subsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Acquisition of Bain Hogg Group plc for approximately $250 million, financed primarily by internal funds; Bain Hogg had 1995 revenues of ~$350 million. Headcount added not disclosed.
1996-09-30voluntary_separationcompleted1996-04-01Domestic and InternationalCorporate and Other; Insurance Underwriting; Insurance Brokerage and Consulting ServicesUSD 30 (millions)MD&A
f5-10q / Qwen3.6-27B-Q8_0		Special charges related to the completion of a voluntary early retirement program introduced domestically in the second quarter as well as similar programs internationally. Employee count not disclosed.
1996-06-30voluntary_separationcompleted4501996-04-021996-06-30United States; parts of EuropeAll eligible employees of US domestic operating subsidiaries; similar programs in parts of EuropeUSD 30 (millions)restructuring_footnote
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Approximately 450 people participated; pretax special charge recorded in Q2 1996 and allocated across all three major lines of business. Program window ran April 2 through June 30, 1996.
1996-06-30divestiture_reductioncompleted1995-12-311996-04-01United StatesInsurance underwriting (Union Fidelity Life Insurance Company; The Life Insurance Company of Virginia)other
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sales completed April 1, 1996 with $1.2 billion after-tax proceeds; no employee count disclosed for the transferred operations.
1996-06-30divestiture_reductioncompleted1996-06-30North AmericaInsurance underwriting — North American auto credit underwriting and distribution, including extended warranty distributionMD&A
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale completed on the quarter-end date; no employee count disclosed. Extended warranty products continue to be underwritten by Virginia Surety Company.
1996-06-30voluntary_separationcompleted4501996-04-021996-06-30United States and parts of EuropeAll eligible employees of US domestic operating subsidiaries and parts of EuropeUSD 30 (millions)restructuring_footnote
f5-10q / Qwen3.6-27B-Q8_0		Voluntary early retirement program for eligible employees; pretax special charges of $30.2 million recorded in Q2 1996.
1996-03-31voluntary_separationannounced1996-04-02United States; parts of EuropeUSA operating subsidiaries; similar programs in parts of Europesubsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Early retirement program announced for eligible employees; costs to be determined and recognized in Q2 1996. No headcount or charge disclosed.
1996-03-31divestiture_reductioncompleted1995-12-311996-04-01United StatesInsurance underwriting (discontinued operations)subsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Sale of Union Fidelity Life Insurance Company and The Life Insurance Company of Virginia completed 1996-04-01 for approximately $1.4 billion; no employee counts disclosed.
1996-03-31divestiture_reductionannounced1996-05-01North AmericaAuto credit business (Ryan Dealer Group)subsequent_events
f5-10q / MiMo-V2.6-Flash-fp8-HTML		Underwriting of North American auto credit business assumed by Life Re as of 1996-05-01; Life Re and Ryan Dealer Group management agreed in principle to buy Ryan Dealer Group. No headcount disclosed.
1996-03-31voluntary_separationannounced1996-04-02USA and parts of Europesubsequent_events
f5-10q / Qwen3.6-27B-Q8_0		Early retirement program announced for eligible employees of USA operating subsidiaries and similar programs in parts of Europe. Costs to be recognized in Q2 1996.
1995-12-31divestiture_reductionannounced1995-11-111996-04-01United StatesInsurance underwriting — direct response life and health (discontinued operations)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of Union Fidelity Life Insurance Company (UFLIC) to General Electric Capital Corporation. Employee count not separately disclosed; filing states discontinued operations employees represent less than 10% of total workforce at year-end 1995. Regulatory consents received; closing expected on or around April 1, 1996.
1995-12-31divestiture_reductionannounced1995-12-221996-04-01United StatesInsurance underwriting — capital accumulation life insurance (discontinued operations)discontinued_operations_footnote
f5-10k / MiMo-V2.6-Flash-fp8-HTML		Sale of The Life Insurance Company of Virginia (LOV) to General Electric Capital Corporation. Employee count not separately disclosed; filing states discontinued operations employees represent less than 10% of total workforce at year-end 1995. Regulatory consents received; closing expected on or around April 1, 1996.