10-Q Filing

AON PLC CIK: 315293 Q2 2025

Filing Information

Form Type	10-Q
Accession Number	`0001628280-25-036060`
Period End Date	20250630
Filing Date	20250725
Fiscal Year	2025
Fiscal Period	Q2
XBRL Instance	aon-20250630_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 158 Income Statement 178 Cash Flow Statement 196 Stockholders Equity 154 Comprehensive Income 94

Balance Sheet 158 line items

Line Item	Tag	Value	Unit	Period
Ordinary shares, nominal value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Ordinary shares, nominal value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Ordinary shares, nominal value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Ordinary shares, nominal value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Ordinary shares, authorized shares (in shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Ordinary shares, authorized shares (in shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Ordinary shares, authorized shares (in shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Ordinary shares, authorized shares (in shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.01B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.01B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.08B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.08B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$974.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$974.00M	USD	Point-in-time
Ordinary shares, issued shares (in shares)	`CommonStockSharesIssued`	215.70M	shares	Point-in-time
Ordinary shares, issued shares (in shares)	`CommonStockSharesIssued`	215.70M	shares	Point-in-time
Ordinary shares, issued shares (in shares)	`CommonStockSharesIssued`	216.00M	shares	Point-in-time
Ordinary shares, issued shares (in shares)	`CommonStockSharesIssued`	216.00M	shares	Point-in-time
Short-term investments	`ShortTermInvestments`	$219.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$219.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$379.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$379.00M	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$4.91B	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$4.91B	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.80B	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.80B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$20.68B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$20.68B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$17.57B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$17.57B	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$759.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$759.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$854.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$854.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$27.82B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$27.82B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$23.43B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$23.43B	USD	Point-in-time
Goodwill	`Goodwill`	$16.02B	USD	Point-in-time
Goodwill	`Goodwill`	$16.02B	USD	Point-in-time
Goodwill	`Goodwill`	$15.23B	USD	Point-in-time
Goodwill	`Goodwill`	$15.23B	USD	Point-in-time
Intangible assets, net	`FiniteLivedIntangibleAssetsNet`	$6.74B	USD	Point-in-time
Intangible assets, net	`FiniteLivedIntangibleAssetsNet`	$6.74B	USD	Point-in-time
Intangible assets, net	`FiniteLivedIntangibleAssetsNet`	$6.73B	USD	Point-in-time
Intangible assets, net	`FiniteLivedIntangibleAssetsNet`	$6.73B	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$664.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$664.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$637.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$637.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$711.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$711.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$735.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$735.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$654.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$654.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$861.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$861.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$556.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$556.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$598.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$598.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$572.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$572.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$998.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$998.00M	USD	Point-in-time
Total assets	`Assets`	$48.97B	USD	Point-in-time
Total assets	`Assets`	$48.97B	USD	Point-in-time
Total assets	`Assets`	$54.01B	USD	Point-in-time
Total assets	`Assets`	$54.01B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.90B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.90B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.29B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.29B	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$1.84B	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$1.84B	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$751.00M	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$751.00M	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$20.68B	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$20.68B	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$17.57B	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$17.57B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$2.27B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$2.27B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.77B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.77B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$27.07B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$27.07B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$23.00B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$23.00B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$16.27B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$16.27B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$15.45B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$15.45B	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$705.00M	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$705.00M	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$685.00M	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$685.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$319.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$319.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$363.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$363.00M	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.08B	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.08B	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.13B	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.13B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$1.14B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$1.14B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$1.25B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$1.25B	USD	Point-in-time
Total liabilities	`Liabilities`	$45.92B	USD	Point-in-time
Total liabilities	`Liabilities`	$45.92B	USD	Point-in-time
Total liabilities	`Liabilities`	$42.53B	USD	Point-in-time
Total liabilities	`Liabilities`	$42.53B	USD	Point-in-time
Redeemable noncontrolling interests	`RedeemableNoncontrollingInterestEquityCarryingAmount`	$81.00M	USD	Point-in-time
Redeemable noncontrolling interests	`RedeemableNoncontrollingInterestEquityCarryingAmount`	$81.00M	USD	Point-in-time
Redeemable noncontrolling interests	`RedeemableNoncontrollingInterestEquityCarryingAmount`	$125.00M	USD	Point-in-time
Redeemable noncontrolling interests	`RedeemableNoncontrollingInterestEquityCarryingAmount`	$125.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2025 - 215.7; 2024 - 216.0)	`CommonStockValue`	$2.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2025 - 215.7; 2024 - 216.0)	`CommonStockValue`	$2.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2025 - 215.7; 2024 - 216.0)	`CommonStockValue`	$2.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2025 - 215.7; 2024 - 216.0)	`CommonStockValue`	$2.00M	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$13.26B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$13.26B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$13.17B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$13.17B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-2.31B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-2.31B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-1.57B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-1.57B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-4.75B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-4.75B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-3.84B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-3.84B	USD	Point-in-time
Total Aon shareholders' equity	`StockholdersEquity`	$7.84B	USD	Point-in-time
Total Aon shareholders' equity	`StockholdersEquity`	$7.84B	USD	Point-in-time
Total Aon shareholders' equity	`StockholdersEquity`	$6.12B	USD	Point-in-time
Total Aon shareholders' equity	`StockholdersEquity`	$6.12B	USD	Point-in-time
Nonredeemable noncontrolling interests	`NonredeemableNoncontrollingInterest`	$165.00M	USD	Point-in-time
Nonredeemable noncontrolling interests	`NonredeemableNoncontrollingInterest`	$165.00M	USD	Point-in-time
Nonredeemable noncontrolling interests	`NonredeemableNoncontrollingInterest`	$184.00M	USD	Point-in-time
Nonredeemable noncontrolling interests	`NonredeemableNoncontrollingInterest`	$184.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.30B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.30B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.03B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.03B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-28.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-28.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.20B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.20B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.01B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.01B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-742.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-742.00M	USD	Point-in-time
Total liabilities, redeemable noncontrolling interests and equity	`LiabilitiesAndStockholdersEquity`	$48.97B	USD	Point-in-time
Total liabilities, redeemable noncontrolling interests and equity	`LiabilitiesAndStockholdersEquity`	$48.97B	USD	Point-in-time
Total liabilities, redeemable noncontrolling interests and equity	`LiabilitiesAndStockholdersEquity`	$54.01B	USD	Point-in-time
Total liabilities, redeemable noncontrolling interests and equity	`LiabilitiesAndStockholdersEquity`	$54.01B	USD	Point-in-time

Income Statement 178 line items

Line Item	Tag	Value	Unit	Period
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$3.76B	USD	1 Quarter
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$3.76B	USD	1 Quarter
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$4.16B	USD	1 Quarter
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$4.16B	USD	1 Quarter
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$8.88B	USD	2 Qtrs
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$8.88B	USD	2 Qtrs
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$7.83B	USD	2 Qtrs
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$7.83B	USD	2 Qtrs
Compensation and benefits	`LaborAndRelatedExpense`	$4.61B	USD	2 Qtrs
Compensation and benefits	`LaborAndRelatedExpense`	$4.61B	USD	2 Qtrs
Compensation and benefits	`LaborAndRelatedExpense`	$2.36B	USD	1 Quarter
Compensation and benefits	`LaborAndRelatedExpense`	$2.36B	USD	1 Quarter
Compensation and benefits	`LaborAndRelatedExpense`	$2.13B	USD	1 Quarter
Compensation and benefits	`LaborAndRelatedExpense`	$2.13B	USD	1 Quarter
Compensation and benefits	`LaborAndRelatedExpense`	$4.01B	USD	2 Qtrs
Compensation and benefits	`LaborAndRelatedExpense`	$4.01B	USD	2 Qtrs
Information technology	`InformationTechnologyAndDataProcessing`	$132.00M	USD	1 Quarter
Information technology	`InformationTechnologyAndDataProcessing`	$132.00M	USD	1 Quarter
Information technology	`InformationTechnologyAndDataProcessing`	$272.00M	USD	2 Qtrs
Information technology	`InformationTechnologyAndDataProcessing`	$272.00M	USD	2 Qtrs
Information technology	`InformationTechnologyAndDataProcessing`	$256.00M	USD	2 Qtrs
Information technology	`InformationTechnologyAndDataProcessing`	$256.00M	USD	2 Qtrs
Information technology	`InformationTechnologyAndDataProcessing`	$136.00M	USD	1 Quarter
Information technology	`InformationTechnologyAndDataProcessing`	$136.00M	USD	1 Quarter
Premises	`OccupancyNet`	$167.00M	USD	2 Qtrs
Premises	`OccupancyNet`	$167.00M	USD	2 Qtrs
Premises	`OccupancyNet`	$153.00M	USD	2 Qtrs
Premises	`OccupancyNet`	$153.00M	USD	2 Qtrs
Premises	`OccupancyNet`	$82.00M	USD	1 Quarter
Premises	`OccupancyNet`	$82.00M	USD	1 Quarter
Premises	`OccupancyNet`	$85.00M	USD	1 Quarter
Premises	`OccupancyNet`	$85.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$45.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$45.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$89.00M	USD	2 Qtrs
Depreciation of fixed assets	`Depreciation`	$89.00M	USD	2 Qtrs
Depreciation of fixed assets	`Depreciation`	$47.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$47.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$93.00M	USD	2 Qtrs
Depreciation of fixed assets	`Depreciation`	$93.00M	USD	2 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$128.00M	USD	1 Quarter
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$128.00M	USD	1 Quarter
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$400.00M	USD	2 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$400.00M	USD	2 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$144.00M	USD	2 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$144.00M	USD	2 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$201.00M	USD	1 Quarter
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$201.00M	USD	1 Quarter
Other general expense	`OtherGeneralExpenses`	$803.00M	USD	2 Qtrs
Other general expense	`OtherGeneralExpenses`	$803.00M	USD	2 Qtrs
Other general expense	`OtherGeneralExpenses`	$455.00M	USD	1 Quarter
Other general expense	`OtherGeneralExpenses`	$455.00M	USD	1 Quarter
Other general expense	`OtherGeneralExpenses`	$373.00M	USD	1 Quarter
Other general expense	`OtherGeneralExpenses`	$373.00M	USD	1 Quarter
Other general expense	`OtherGeneralExpenses`	$819.00M	USD	2 Qtrs
Other general expense	`OtherGeneralExpenses`	$819.00M	USD	2 Qtrs
Accelerating Aon United Program expenses	`RestructuringCharges`	$132.00M	USD	1 Quarter
Accelerating Aon United Program expenses	`RestructuringCharges`	$132.00M	USD	1 Quarter
Accelerating Aon United Program expenses	`RestructuringCharges`	$251.00M	USD	2 Qtrs
Accelerating Aon United Program expenses	`RestructuringCharges`	$251.00M	USD	2 Qtrs
Accelerating Aon United Program expenses	`RestructuringCharges`	$94.00M	USD	1 Quarter
Accelerating Aon United Program expenses	`RestructuringCharges`	$94.00M	USD	1 Quarter
Accelerating Aon United Program expenses	`RestructuringCharges`	$204.00M	USD	2 Qtrs
Accelerating Aon United Program expenses	`RestructuringCharges`	$204.00M	USD	2 Qtrs
Total operating expenses	`CostsAndExpenses`	$6.56B	USD	2 Qtrs
Total operating expenses	`CostsAndExpenses`	$6.56B	USD	2 Qtrs
Total operating expenses	`CostsAndExpenses`	$5.71B	USD	2 Qtrs
Total operating expenses	`CostsAndExpenses`	$5.71B	USD	2 Qtrs
Total operating expenses	`CostsAndExpenses`	$3.30B	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$3.30B	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$3.10B	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$3.10B	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$656.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$656.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$2.12B	USD	2 Qtrs
Operating income	`OperatingIncomeLoss`	$2.12B	USD	2 Qtrs
Operating income	`OperatingIncomeLoss`	$859.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$859.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$2.32B	USD	2 Qtrs
Operating income	`OperatingIncomeLoss`	$2.32B	USD	2 Qtrs
Interest income	`InvestmentIncomeInterestAndDividend`	$31.00M	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	$31.00M	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	$59.00M	USD	2 Qtrs
Interest income	`InvestmentIncomeInterestAndDividend`	$59.00M	USD	2 Qtrs
Interest income	`InvestmentIncomeInterestAndDividend`	-	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	-	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	$5.00M	USD	2 Qtrs
Interest income	`InvestmentIncomeInterestAndDividend`	$5.00M	USD	2 Qtrs
Interest expense	`InterestExpenseNonoperating`	$369.00M	USD	2 Qtrs
Interest expense	`InterestExpenseNonoperating`	$369.00M	USD	2 Qtrs
Interest expense	`InterestExpenseNonoperating`	$225.00M	USD	1 Quarter
Interest expense	`InterestExpenseNonoperating`	$225.00M	USD	1 Quarter
Interest expense	`InterestExpenseNonoperating`	$418.00M	USD	2 Qtrs
Interest expense	`InterestExpenseNonoperating`	$418.00M	USD	2 Qtrs
Interest expense	`InterestExpenseNonoperating`	$212.00M	USD	1 Quarter
Interest expense	`InterestExpenseNonoperating`	$212.00M	USD	1 Quarter
Other income (expense)	`OtherNonoperatingIncomeExpense`	$236.00M	USD	1 Quarter
Other income (expense)	`OtherNonoperatingIncomeExpense`	$236.00M	USD	1 Quarter
Other income (expense)	`OtherNonoperatingIncomeExpense`	$56.00M	USD	1 Quarter
Other income (expense)	`OtherNonoperatingIncomeExpense`	$56.00M	USD	1 Quarter
Other income (expense)	`OtherNonoperatingIncomeExpense`	$46.00M	USD	2 Qtrs
Other income (expense)	`OtherNonoperatingIncomeExpense`	$46.00M	USD	2 Qtrs
Other income (expense)	`OtherNonoperatingIncomeExpense`	$311.00M	USD	2 Qtrs
Other income (expense)	`OtherNonoperatingIncomeExpense`	$311.00M	USD	2 Qtrs
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$2.12B	USD	2 Qtrs
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$2.12B	USD	2 Qtrs
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$1.95B	USD	2 Qtrs
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$1.95B	USD	2 Qtrs
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$703.00M	USD	1 Quarter
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$703.00M	USD	1 Quarter
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$698.00M	USD	1 Quarter
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$698.00M	USD	1 Quarter
Income tax expense	`IncomeTaxExpenseBenefit`	$109.00M	USD	1 Quarter
Income tax expense	`IncomeTaxExpenseBenefit`	$109.00M	USD	1 Quarter
Income tax expense	`IncomeTaxExpenseBenefit`	$491.00M	USD	2 Qtrs
Income tax expense	`IncomeTaxExpenseBenefit`	$491.00M	USD	2 Qtrs
Income tax expense	`IncomeTaxExpenseBenefit`	$377.00M	USD	2 Qtrs
Income tax expense	`IncomeTaxExpenseBenefit`	$377.00M	USD	2 Qtrs
Income tax expense	`IncomeTaxExpenseBenefit`	$160.00M	USD	1 Quarter
Income tax expense	`IncomeTaxExpenseBenefit`	$160.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.58B	USD	2 Qtrs
Net income	`ProfitLoss`	$1.58B	USD	2 Qtrs
Net income	`ProfitLoss`	$594.00M	USD	1 Quarter
Net income	`ProfitLoss`	$594.00M	USD	1 Quarter
Net income	`ProfitLoss`	$538.00M	USD	1 Quarter
Net income	`ProfitLoss`	$538.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.63B	USD	2 Qtrs
Net income	`ProfitLoss`	$1.63B	USD	2 Qtrs
Net income	`ProfitLoss`	$982.00M	USD	1 Quarter
Net income	`ProfitLoss`	$982.00M	USD	1 Quarter
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$36.00M	USD	2 Qtrs
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$36.00M	USD	2 Qtrs
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$32.00M	USD	2 Qtrs
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$32.00M	USD	2 Qtrs
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$15.00M	USD	1 Quarter
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$15.00M	USD	1 Quarter
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$14.00M	USD	1 Quarter
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$14.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$524.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$524.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$579.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$579.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.59B	USD	2 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.59B	USD	2 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.54B	USD	2 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.54B	USD	2 Qtrs
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$2.47	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$2.47	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$7.75	USD	2 Qtrs
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$7.75	USD	2 Qtrs
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$2.68	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$2.68	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$7.14	USD	2 Qtrs
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$7.14	USD	2 Qtrs
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$7.10	USD	2 Qtrs
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$7.10	USD	2 Qtrs
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$7.72	USD	2 Qtrs
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$7.72	USD	2 Qtrs
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$2.66	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$2.66	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$2.46	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$2.46	USD	1 Quarter
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	205.80M	shares	2 Qtrs
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	205.80M	shares	2 Qtrs
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	212.50M	shares	1 Quarter
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	212.50M	shares	1 Quarter
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	216.30M	shares	2 Qtrs
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	216.30M	shares	2 Qtrs
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	216.20M	shares	1 Quarter
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	216.20M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	217.30M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	217.30M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	217.60M	shares	2 Qtrs
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	217.60M	shares	2 Qtrs
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	213.30M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	213.30M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	206.70M	shares	2 Qtrs
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	206.70M	shares	2 Qtrs

Cash Flow Statement 196 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$1.58B	USD	2 Qtrs
Net income	`ProfitLoss`	$1.58B	USD	2 Qtrs
Net income	`ProfitLoss`	$594.00M	USD	1 Quarter
Net income	`ProfitLoss`	$594.00M	USD	1 Quarter
Net income	`ProfitLoss`	$538.00M	USD	1 Quarter
Net income	`ProfitLoss`	$538.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.63B	USD	2 Qtrs
Net income	`ProfitLoss`	$1.63B	USD	2 Qtrs
Net income	`ProfitLoss`	$982.00M	USD	1 Quarter
Net income	`ProfitLoss`	$982.00M	USD	1 Quarter
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$257.00M	USD	2 Qtrs
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$257.00M	USD	2 Qtrs
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	-	USD	2 Qtrs
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	-	USD	2 Qtrs
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$257.00M	USD	1 Quarter
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$257.00M	USD	1 Quarter
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	-	USD	1 Quarter
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	-	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$45.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$45.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$89.00M	USD	2 Qtrs
Depreciation of fixed assets	`Depreciation`	$89.00M	USD	2 Qtrs
Depreciation of fixed assets	`Depreciation`	$47.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$47.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$93.00M	USD	2 Qtrs
Depreciation of fixed assets	`Depreciation`	$93.00M	USD	2 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$128.00M	USD	1 Quarter
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$128.00M	USD	1 Quarter
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$400.00M	USD	2 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$400.00M	USD	2 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$144.00M	USD	2 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$144.00M	USD	2 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$201.00M	USD	1 Quarter
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$201.00M	USD	1 Quarter
Share-based compensation expense	`ShareBasedCompensation`	$247.00M	USD	2 Qtrs
Share-based compensation expense	`ShareBasedCompensation`	$247.00M	USD	2 Qtrs
Share-based compensation expense	`ShareBasedCompensation`	$266.00M	USD	2 Qtrs
Share-based compensation expense	`ShareBasedCompensation`	$266.00M	USD	2 Qtrs
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-242.00M	USD	2 Qtrs
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-242.00M	USD	2 Qtrs
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-122.00M	USD	2 Qtrs
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-122.00M	USD	2 Qtrs
Other, net	`OtherNoncashIncomeExpense`	$112.00M	USD	2 Qtrs
Other, net	`OtherNoncashIncomeExpense`	$112.00M	USD	2 Qtrs
Other, net	`OtherNoncashIncomeExpense`	$111.00M	USD	2 Qtrs
Other, net	`OtherNoncashIncomeExpense`	$111.00M	USD	2 Qtrs
Receivables, net	`IncreaseDecreaseInReceivables`	$959.00M	USD	2 Qtrs
Receivables, net	`IncreaseDecreaseInReceivables`	$959.00M	USD	2 Qtrs
Receivables, net	`IncreaseDecreaseInReceivables`	$902.00M	USD	2 Qtrs
Receivables, net	`IncreaseDecreaseInReceivables`	$902.00M	USD	2 Qtrs
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-738.00M	USD	2 Qtrs
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-738.00M	USD	2 Qtrs
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-251.00M	USD	2 Qtrs
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-251.00M	USD	2 Qtrs
Accelerating Aon United Program liabilities	`IncreaseDecreaseInRestructuringReserve`	$15.00M	USD	2 Qtrs
Accelerating Aon United Program liabilities	`IncreaseDecreaseInRestructuringReserve`	$15.00M	USD	2 Qtrs
Accelerating Aon United Program liabilities	`IncreaseDecreaseInRestructuringReserve`	$61.00M	USD	2 Qtrs
Accelerating Aon United Program liabilities	`IncreaseDecreaseInRestructuringReserve`	$61.00M	USD	2 Qtrs
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$-73.00M	USD	2 Qtrs
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$-73.00M	USD	2 Qtrs
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$60.00M	USD	2 Qtrs
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$60.00M	USD	2 Qtrs
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-17.00M	USD	2 Qtrs
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-17.00M	USD	2 Qtrs
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-12.00M	USD	2 Qtrs
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-12.00M	USD	2 Qtrs
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-664.00M	USD	2 Qtrs
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-664.00M	USD	2 Qtrs
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-308.00M	USD	2 Qtrs
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-308.00M	USD	2 Qtrs
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$936.00M	USD	2 Qtrs
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$936.00M	USD	2 Qtrs
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$822.00M	USD	2 Qtrs
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$822.00M	USD	2 Qtrs
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$146.00M	USD	2 Qtrs
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$146.00M	USD	2 Qtrs
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$71.00M	USD	2 Qtrs
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$71.00M	USD	2 Qtrs
Purchases of investments	`PaymentsToAcquireOtherInvestments`	$91.00M	USD	2 Qtrs
Purchases of investments	`PaymentsToAcquireOtherInvestments`	$91.00M	USD	2 Qtrs
Purchases of investments	`PaymentsToAcquireOtherInvestments`	$42.00M	USD	2 Qtrs
Purchases of investments	`PaymentsToAcquireOtherInvestments`	$42.00M	USD	2 Qtrs
Net purchases (sales) of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$-189.00M	USD	2 Qtrs
Net purchases (sales) of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$-189.00M	USD	2 Qtrs
Net purchases (sales) of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$153.00M	USD	2 Qtrs
Net purchases (sales) of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$153.00M	USD	2 Qtrs
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$143.00M	USD	2 Qtrs
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$143.00M	USD	2 Qtrs
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$2.78B	USD	2 Qtrs
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$2.78B	USD	2 Qtrs
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$352.00M	USD	2 Qtrs
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$352.00M	USD	2 Qtrs
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$119.00M	USD	2 Qtrs
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$119.00M	USD	2 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$120.00M	USD	2 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$120.00M	USD	2 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$101.00M	USD	2 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$101.00M	USD	2 Qtrs
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-2.29B	USD	2 Qtrs
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-2.29B	USD	2 Qtrs
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-268.00M	USD	2 Qtrs
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-268.00M	USD	2 Qtrs
Share repurchase	`PaymentsForRepurchaseOfEquity`	$500.00M	USD	2 Qtrs
Share repurchase	`PaymentsForRepurchaseOfEquity`	$500.00M	USD	2 Qtrs
Share repurchase	`PaymentsForRepurchaseOfEquity`	$500.00M	USD	2 Qtrs
Share repurchase	`PaymentsForRepurchaseOfEquity`	$500.00M	USD	2 Qtrs
Proceeds from issuance of shares	`ProceedsFromIssuanceOfCommonStock`	$33.00M	USD	2 Qtrs
Proceeds from issuance of shares	`ProceedsFromIssuanceOfCommonStock`	$33.00M	USD	2 Qtrs
Proceeds from issuance of shares	`ProceedsFromIssuanceOfCommonStock`	$27.00M	USD	2 Qtrs
Proceeds from issuance of shares	`ProceedsFromIssuanceOfCommonStock`	$27.00M	USD	2 Qtrs
Cash paid for employee taxes on withholding shares	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$176.00M	USD	2 Qtrs
Cash paid for employee taxes on withholding shares	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$176.00M	USD	2 Qtrs
Cash paid for employee taxes on withholding shares	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$194.00M	USD	2 Qtrs
Cash paid for employee taxes on withholding shares	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$194.00M	USD	2 Qtrs
Commercial paper issuances, net of repayments	`ProceedsFromRepaymentsOfCommercialPaper`	$480.00M	USD	2 Qtrs
Commercial paper issuances, net of repayments	`ProceedsFromRepaymentsOfCommercialPaper`	$480.00M	USD	2 Qtrs
Commercial paper issuances, net of repayments	`ProceedsFromRepaymentsOfCommercialPaper`	$-591.00M	USD	2 Qtrs
Commercial paper issuances, net of repayments	`ProceedsFromRepaymentsOfCommercialPaper`	$-591.00M	USD	2 Qtrs
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	-	USD	2 Qtrs
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	-	USD	2 Qtrs
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$7.93B	USD	2 Qtrs
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$7.93B	USD	2 Qtrs
Repayment of debt	`RepaymentsOfLongTermDebt`	$300.00M	USD	2 Qtrs
Repayment of debt	`RepaymentsOfLongTermDebt`	$300.00M	USD	2 Qtrs
Repayment of debt	`RepaymentsOfLongTermDebt`	$4.33B	USD	2 Qtrs
Repayment of debt	`RepaymentsOfLongTermDebt`	$4.33B	USD	2 Qtrs
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$569.00M	USD	2 Qtrs
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$569.00M	USD	2 Qtrs
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$283.00M	USD	2 Qtrs
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$283.00M	USD	2 Qtrs
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$308.00M	USD	2 Qtrs
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$308.00M	USD	2 Qtrs
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$269.00M	USD	2 Qtrs
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$269.00M	USD	2 Qtrs
Redeemable and nonredeemable noncontrolling interests, and other financing activities	`ProceedsFromPaymentsForNoncontrollingInterestsAndOtherFinancingActivities`	$-108.00M	USD	2 Qtrs
Redeemable and nonredeemable noncontrolling interests, and other financing activities	`ProceedsFromPaymentsForNoncontrollingInterestsAndOtherFinancingActivities`	$-108.00M	USD	2 Qtrs
Redeemable and nonredeemable noncontrolling interests, and other financing activities	`ProceedsFromPaymentsForNoncontrollingInterestsAndOtherFinancingActivities`	$-153.00M	USD	2 Qtrs
Redeemable and nonredeemable noncontrolling interests, and other financing activities	`ProceedsFromPaymentsForNoncontrollingInterestsAndOtherFinancingActivities`	$-153.00M	USD	2 Qtrs
Cash provided by (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-373.00M	USD	2 Qtrs
Cash provided by (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-373.00M	USD	2 Qtrs
Cash provided by (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$2.26B	USD	2 Qtrs
Cash provided by (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$2.26B	USD	2 Qtrs
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-202.00M	USD	2 Qtrs
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-202.00M	USD	2 Qtrs
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$696.00M	USD	2 Qtrs
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$696.00M	USD	2 Qtrs
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$991.00M	USD	2 Qtrs
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$991.00M	USD	2 Qtrs
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$599.00M	USD	2 Qtrs
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$599.00M	USD	2 Qtrs
Cash, cash equivalents and funds held on behalf of clients at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.33B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.33B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$9.32B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$9.32B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.32B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.32B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.72B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.72B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.33B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.33B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$9.32B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$9.32B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.32B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.32B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.72B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.72B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.01B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.01B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.08B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.08B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$974.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$974.00M	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients classified as held for sale	`DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents`	$38.00M	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients classified as held for sale	`DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents`	$38.00M	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients classified as held for sale	`DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents`	$1.00M	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients classified as held for sale	`DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents`	$1.00M	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$8.31B	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$8.31B	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$7.31B	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$7.31B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.33B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.33B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$9.32B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$9.32B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.32B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.32B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.72B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.72B	USD	Point-in-time
Interest paid	`InterestPaidNet`	$416.00M	USD	2 Qtrs
Interest paid	`InterestPaidNet`	$416.00M	USD	2 Qtrs
Interest paid	`InterestPaidNet`	$256.00M	USD	2 Qtrs
Interest paid	`InterestPaidNet`	$256.00M	USD	2 Qtrs
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$692.00M	USD	2 Qtrs
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$692.00M	USD	2 Qtrs
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$553.00M	USD	2 Qtrs
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$553.00M	USD	2 Qtrs

Stockholders Equity 154 line items

Line Item	Tag	Value	Unit	Period
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$0.68	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$0.68	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$0.68	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$0.68	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$0.74	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$0.74	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$0.61	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$0.61	USD	1 Quarter
Net income	`ProfitLoss`	$1.58B	USD	2 Qtrs
Net income	`ProfitLoss`	$1.58B	USD	2 Qtrs
Net income	`ProfitLoss`	$594.00M	USD	1 Quarter
Net income	`ProfitLoss`	$594.00M	USD	1 Quarter
Net income	`ProfitLoss`	$538.00M	USD	1 Quarter
Net income	`ProfitLoss`	$538.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.63B	USD	2 Qtrs
Net income	`ProfitLoss`	$1.63B	USD	2 Qtrs
Net income	`ProfitLoss`	$982.00M	USD	1 Quarter
Net income	`ProfitLoss`	$982.00M	USD	1 Quarter
Net income (loss) related to redeemable noncontrolling interest	`NetIncomeLossAttributableToRedeemableNoncontrollingInterest`	$-4.00M	USD	1 Quarter
Net income (loss) related to redeemable noncontrolling interest	`NetIncomeLossAttributableToRedeemableNoncontrollingInterest`	$-4.00M	USD	1 Quarter
Net income (loss) related to redeemable noncontrolling interest	`NetIncomeLossAttributableToRedeemableNoncontrollingInterest`	$1.00M	USD	1 Quarter
Net income (loss) related to redeemable noncontrolling interest	`NetIncomeLossAttributableToRedeemableNoncontrollingInterest`	$1.00M	USD	1 Quarter
Net income (loss) related to redeemable noncontrolling interest	`NetIncomeLossAttributableToRedeemableNoncontrollingInterest`	$2.00M	USD	1 Quarter
Net income (loss) related to redeemable noncontrolling interest	`NetIncomeLossAttributableToRedeemableNoncontrollingInterest`	$2.00M	USD	1 Quarter
Beginning balance (in shares)	`CommonStockSharesIssued`	215.70M	shares	Point-in-time
Beginning balance (in shares)	`CommonStockSharesIssued`	215.70M	shares	Point-in-time
Beginning balance (in shares)	`CommonStockSharesIssued`	216.00M	shares	Point-in-time
Beginning balance (in shares)	`CommonStockSharesIssued`	216.00M	shares	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.30B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.30B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.03B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.03B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-28.00M	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-28.00M	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.20B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.20B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.01B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.01B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-742.00M	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-742.00M	USD	Point-in-time
Net income	`NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest`	$986.00M	USD	1 Quarter
Net income	`NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest`	$986.00M	USD	1 Quarter
Net income	`NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest`	$593.00M	USD	1 Quarter
Net income	`NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest`	$593.00M	USD	1 Quarter
Net income	`NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest`	$536.00M	USD	1 Quarter
Net income	`NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest`	$536.00M	USD	1 Quarter
Net income	`NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest`	$1.09B	USD	1 Quarter
Net income	`NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest`	$1.09B	USD	1 Quarter
Shares issued - NFP Transaction	`StockIssuedDuringPeriodValueAcquisitions`	$5.88B	USD	1 Quarter
Shares issued - NFP Transaction	`StockIssuedDuringPeriodValueAcquisitions`	$5.88B	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-104.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-104.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-50.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-50.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-111.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-111.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-45.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-45.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedAndRetiredDuringPeriodValue`	$250.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedAndRetiredDuringPeriodValue`	$250.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedAndRetiredDuringPeriodValue`	$250.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedAndRetiredDuringPeriodValue`	$250.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedAndRetiredDuringPeriodValue`	$250.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedAndRetiredDuringPeriodValue`	$250.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedAndRetiredDuringPeriodValue`	$250.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedAndRetiredDuringPeriodValue`	$250.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$119.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$119.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$117.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$117.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$130.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$130.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$147.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$147.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$122.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$122.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$162.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$162.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$148.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$148.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$146.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$146.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$10.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$10.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$1.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$1.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$3.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$3.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$75.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$75.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$13.00M	USD	2 Qtrs
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$13.00M	USD	2 Qtrs
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$76.00M	USD	2 Qtrs
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$76.00M	USD	2 Qtrs
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$239.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$239.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$843.00M	USD	2 Qtrs
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$843.00M	USD	2 Qtrs
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-88.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-88.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-132.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-132.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-220.00M	USD	2 Qtrs
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-220.00M	USD	2 Qtrs
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$604.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$604.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-39.00M	USD	2 Qtrs
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-39.00M	USD	2 Qtrs
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$1.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$1.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-47.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-47.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-46.00M	USD	2 Qtrs
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-46.00M	USD	2 Qtrs
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-26.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-26.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-13.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-13.00M	USD	1 Quarter
Purchases of subsidiary shares from nonredeemable noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$1.00M	USD	1 Quarter
Purchases of subsidiary shares from nonredeemable noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$1.00M	USD	1 Quarter
Purchases of subsidiary shares from nonredeemable noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$9.00M	USD	1 Quarter
Purchases of subsidiary shares from nonredeemable noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$9.00M	USD	1 Quarter
Purchases of subsidiary shares from nonredeemable noncontrolling interests	`NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsNetOfInterestAcquired`	$-86.00M	USD	1 Quarter
Purchases of subsidiary shares from nonredeemable noncontrolling interests	`NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsNetOfInterestAcquired`	$-86.00M	USD	1 Quarter
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$35.00M	USD	1 Quarter
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$35.00M	USD	1 Quarter
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$14.00M	USD	1 Quarter
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$14.00M	USD	1 Quarter
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$1.00M	USD	1 Quarter
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$1.00M	USD	1 Quarter
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$40.00M	USD	1 Quarter
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$40.00M	USD	1 Quarter
Remeasurement of redemption value of redeemable noncontrolling interest	`MinorityInterestChangeInRedemptionValue`	$-1.00M	USD	1 Quarter
Remeasurement of redemption value of redeemable noncontrolling interest	`MinorityInterestChangeInRedemptionValue`	$-1.00M	USD	1 Quarter
Remeasurement of redemption value of redeemable noncontrolling interest	`MinorityInterestChangeInRedemptionValue`	$-13.00M	USD	1 Quarter
Remeasurement of redemption value of redeemable noncontrolling interest	`MinorityInterestChangeInRedemptionValue`	$-13.00M	USD	1 Quarter
Remeasurement of redemption value of redeemable noncontrolling interest	`MinorityInterestChangeInRedemptionValue`	$-11.00M	USD	1 Quarter
Remeasurement of redemption value of redeemable noncontrolling interest	`MinorityInterestChangeInRedemptionValue`	$-11.00M	USD	1 Quarter
Ending balance (in shares)	`CommonStockSharesIssued`	215.70M	shares	Point-in-time
Ending balance (in shares)	`CommonStockSharesIssued`	215.70M	shares	Point-in-time
Ending balance (in shares)	`CommonStockSharesIssued`	216.00M	shares	Point-in-time
Ending balance (in shares)	`CommonStockSharesIssued`	216.00M	shares	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.30B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.30B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.03B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.03B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-28.00M	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-28.00M	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.20B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.20B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.01B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.01B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-742.00M	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-742.00M	USD	Point-in-time

Comprehensive Income 94 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$1.58B	USD	2 Qtrs
Net income	`ProfitLoss`	$1.58B	USD	2 Qtrs
Net income	`ProfitLoss`	$594.00M	USD	1 Quarter
Net income	`ProfitLoss`	$594.00M	USD	1 Quarter
Net income	`ProfitLoss`	$538.00M	USD	1 Quarter
Net income	`ProfitLoss`	$538.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.63B	USD	2 Qtrs
Net income	`ProfitLoss`	$1.63B	USD	2 Qtrs
Net income	`ProfitLoss`	$982.00M	USD	1 Quarter
Net income	`ProfitLoss`	$982.00M	USD	1 Quarter
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$36.00M	USD	2 Qtrs
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$36.00M	USD	2 Qtrs
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$32.00M	USD	2 Qtrs
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$32.00M	USD	2 Qtrs
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$15.00M	USD	1 Quarter
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$15.00M	USD	1 Quarter
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$14.00M	USD	1 Quarter
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$14.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$524.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$524.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$579.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$579.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.59B	USD	2 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.59B	USD	2 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.54B	USD	2 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.54B	USD	2 Qtrs
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$10.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$10.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$1.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$1.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$3.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$3.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$75.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$75.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$13.00M	USD	2 Qtrs
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$13.00M	USD	2 Qtrs
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$76.00M	USD	2 Qtrs
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$76.00M	USD	2 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$239.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$239.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$843.00M	USD	2 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$843.00M	USD	2 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-88.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-88.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-132.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-132.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-220.00M	USD	2 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-220.00M	USD	2 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$604.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$604.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-39.00M	USD	2 Qtrs
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-39.00M	USD	2 Qtrs
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$1.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$1.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-47.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-47.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-46.00M	USD	2 Qtrs
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-46.00M	USD	2 Qtrs
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-26.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-26.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-13.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-13.00M	USD	1 Quarter
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-74.00M	USD	1 Quarter
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-74.00M	USD	1 Quarter
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$613.00M	USD	1 Quarter
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$613.00M	USD	1 Quarter
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-105.00M	USD	2 Qtrs
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-105.00M	USD	2 Qtrs
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$902.00M	USD	2 Qtrs
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$902.00M	USD	2 Qtrs
Less: Other comprehensive income attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Less: Other comprehensive income attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Less: Other comprehensive income attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	2 Qtrs
Less: Other comprehensive income attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	2 Qtrs
Less: Other comprehensive income attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	2 Qtrs
Less: Other comprehensive income attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	2 Qtrs
Less: Other comprehensive income attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Less: Other comprehensive income attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$613.00M	USD	1 Quarter
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$613.00M	USD	1 Quarter
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$902.00M	USD	2 Qtrs
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$902.00M	USD	2 Qtrs
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-105.00M	USD	2 Qtrs
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-105.00M	USD	2 Qtrs
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-74.00M	USD	1 Quarter
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-74.00M	USD	1 Quarter
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$1.49B	USD	2 Qtrs
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$1.49B	USD	2 Qtrs
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$2.45B	USD	2 Qtrs
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$2.45B	USD	2 Qtrs
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$450.00M	USD	1 Quarter
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$450.00M	USD	1 Quarter
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$1.19B	USD	1 Quarter
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$1.19B	USD	1 Quarter

Data is extracted from SEC EDGAR XBRL filings. Values shown are as reported in the filing.