10-Q Filing

AON PLC CIK: 315293 Q3 2021

Filing Information

Form Type	10-Q
Accession Number	`0001628280-21-020852`
Period End Date	20210930
Filing Date	20211029
Fiscal Year	2021
Fiscal Period	Q3
XBRL Instance	aon-20210930_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 78 Income Statement 88 Cash Flow Statement 82 Stockholders Equity 89 Comprehensive Income 56

Balance Sheet 78 line items

Line Item	Tag	Value	Unit	Period
Common stock, nominal or par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Common stock, nominal or par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Common stock, authorized shares (in shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Common stock, authorized shares (in shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$609.00M	USD	Point-in-time
Common stock, issued shares (in shares)	`CommonStockSharesIssued`	225.50M	shares	Point-in-time
Common stock, issued shares (in shares)	`CommonStockSharesIssued`	221.40M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$884.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$308.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$310.00M	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.07B	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.12B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$13.80B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$14.02B	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$687.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$624.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$18.68B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$18.74B	USD	Point-in-time
Goodwill	`Goodwill`	$8.67B	USD	Point-in-time
Goodwill	`Goodwill`	$8.55B	USD	Point-in-time
Intangible assets, net	`FiniteLivedIntangibleAssetsNet`	$640.00M	USD	Point-in-time
Intangible assets, net	`FiniteLivedIntangibleAssetsNet`	$529.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$541.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$599.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$911.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$823.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$724.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$761.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$1.35B	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$1.28B	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$525.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$610.00M	USD	Point-in-time
Total assets	`Assets`	$32.11B	USD	Point-in-time
Total assets	`Assets`	$31.82B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.00B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.02B	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$448.00M	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$150.00M	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$14.02B	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$13.80B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.17B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.35B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$17.43B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$17.51B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$7.28B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$8.25B	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$817.00M	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$897.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$414.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$262.00M	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.61B	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.76B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$919.00M	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$895.00M	USD	Point-in-time
Total liabilities	`Liabilities`	$29.52B	USD	Point-in-time
Total liabilities	`Liabilities`	$28.53B	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2021 - 221.4; 2020 - 225.5)	`CommonStockValue`	$2.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2021 - 221.4; 2020 - 225.5)	`CommonStockValue`	$2.00M	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$6.53B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$6.31B	USD	Point-in-time
Retained earnings (accumulated deficit)	`RetainedEarningsAccumulatedDeficit`	$1.04B	USD	Point-in-time
Retained earnings (accumulated deficit)	`RetainedEarningsAccumulatedDeficit`	$-445.00M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-3.86B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-3.88B	USD	Point-in-time
Total Aon shareholders' equity	`StockholdersEquity`	$2.21B	USD	Point-in-time
Total Aon shareholders' equity	`StockholdersEquity`	$3.50B	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$88.00M	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$90.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.57B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.36B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.58B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$2.30B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.62B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.26B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.69B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.44B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$31.82B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$32.11B	USD	Point-in-time

Income Statement 88 line items

Line Item	Tag	Value	Unit	Period
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$2.70B	USD	1 Quarter
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$9.11B	USD	3 Qtrs
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$2.38B	USD	1 Quarter
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$8.10B	USD	3 Qtrs
Compensation and benefits	`LaborAndRelatedExpense`	$1.39B	USD	1 Quarter
Compensation and benefits	`LaborAndRelatedExpense`	$1.83B	USD	1 Quarter
Compensation and benefits	`LaborAndRelatedExpense`	$4.27B	USD	3 Qtrs
Compensation and benefits	`LaborAndRelatedExpense`	$5.18B	USD	3 Qtrs
Information technology	`InformationTechnologyAndDataProcessing`	$130.00M	USD	1 Quarter
Information technology	`InformationTechnologyAndDataProcessing`	$107.00M	USD	1 Quarter
Information technology	`InformationTechnologyAndDataProcessing`	$325.00M	USD	3 Qtrs
Information technology	`InformationTechnologyAndDataProcessing`	$359.00M	USD	3 Qtrs
Premises	`OccupancyNet`	$70.00M	USD	1 Quarter
Premises	`OccupancyNet`	$251.00M	USD	3 Qtrs
Premises	`OccupancyNet`	$98.00M	USD	1 Quarter
Premises	`OccupancyNet`	$217.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$56.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$138.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$42.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$124.00M	USD	3 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$50.00M	USD	1 Quarter
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$36.00M	USD	1 Quarter
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$112.00M	USD	3 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$205.00M	USD	3 Qtrs
Other general expense	`OtherGeneralExpenses`	$1.96B	USD	3 Qtrs
Other general expense	`OtherGeneralExpenses`	$892.00M	USD	3 Qtrs
Other general expense	`OtherGeneralExpenses`	$1.35B	USD	1 Quarter
Other general expense	`OtherGeneralExpenses`	$288.00M	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$1.94B	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$6.03B	USD	3 Qtrs
Total operating expenses	`CostsAndExpenses`	$8.00B	USD	3 Qtrs
Total operating expenses	`CostsAndExpenses`	$3.50B	USD	1 Quarter
Operating income (loss)	`OperatingIncomeLoss`	$1.12B	USD	3 Qtrs
Operating income (loss)	`OperatingIncomeLoss`	$-801.00M	USD	1 Quarter
Operating income (loss)	`OperatingIncomeLoss`	$2.07B	USD	3 Qtrs
Operating income (loss)	`OperatingIncomeLoss`	$441.00M	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	$9.00M	USD	3 Qtrs
Interest income	`InvestmentIncomeInterestAndDividend`	$3.00M	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	$5.00M	USD	3 Qtrs
Interest income	`InvestmentIncomeInterestAndDividend`	$3.00M	USD	1 Quarter
Interest expense	`InterestExpense`	$80.00M	USD	1 Quarter
Interest expense	`InterestExpense`	$80.00M	USD	1 Quarter
Interest expense	`InterestExpense`	$252.00M	USD	3 Qtrs
Interest expense	`InterestExpense`	$237.00M	USD	3 Qtrs
Other income (expense)	`OtherNonoperatingIncomeExpense`	$19.00M	USD	3 Qtrs
Other income (expense)	`OtherNonoperatingIncomeExpense`	$7.00M	USD	3 Qtrs
Other income (expense)	`OtherNonoperatingIncomeExpense`	$10.00M	USD	1 Quarter
Other income (expense)	`OtherNonoperatingIncomeExpense`	-	USD	1 Quarter
Income (loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$895.00M	USD	3 Qtrs
Income (loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$1.84B	USD	3 Qtrs
Income (loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$364.00M	USD	1 Quarter
Income (loss) before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$-868.00M	USD	1 Quarter
Income tax expense	`IncomeTaxExpenseBenefit`	$82.00M	USD	1 Quarter
Income tax expense	`IncomeTaxExpenseBenefit`	$356.00M	USD	3 Qtrs
Income tax expense	`IncomeTaxExpenseBenefit`	$23.00M	USD	1 Quarter
Income tax expense	`IncomeTaxExpenseBenefit`	$460.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$-891.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$1.48B	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$393.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$791.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$411.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$933.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$435.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$282.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$43.00M	USD	3 Qtrs
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$39.00M	USD	3 Qtrs
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$9.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$7.00M	USD	1 Quarter
Net income (loss) attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$275.00M	USD	1 Quarter
Net income (loss) attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$392.00M	USD	3 Qtrs
Net income (loss) attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$-900.00M	USD	1 Quarter
Net income (loss) attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.45B	USD	3 Qtrs
Basic net income (loss) per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$1.18	USD	1 Quarter
Basic net income (loss) per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$6.21	USD	3 Qtrs
Basic net income (loss) per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$1.73	USD	3 Qtrs
Basic net income (loss) per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$-3.99	USD	1 Quarter
Diluted net income (loss) per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$6.18	USD	3 Qtrs
Diluted net income (loss) per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$1.72	USD	3 Qtrs
Diluted net income (loss) per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$-3.99	USD	1 Quarter
Diluted net income (loss) per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$1.18	USD	1 Quarter
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	226.50M	shares	3 Qtrs
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	232.80M	shares	3 Qtrs
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	232.60M	shares	1 Quarter
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	225.40M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	225.40M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	233.50M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	227.70M	shares	3 Qtrs
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	233.90M	shares	3 Qtrs

Cash Flow Statement 82 line items

Line Item	Tag	Value	Unit	Period
Net income (loss)	`ProfitLoss`	$-891.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$1.48B	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$393.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$791.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$411.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$933.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$435.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$282.00M	USD	1 Quarter
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$2.00M	USD	3 Qtrs
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$25.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$56.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$138.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$42.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$124.00M	USD	3 Qtrs
Amortization and impairment of intangible assets	`AmortizationOfIntangibleAssets`	$205.00M	USD	3 Qtrs
Amortization and impairment of intangible assets	`AmortizationOfIntangibleAssets`	$112.00M	USD	3 Qtrs
Share-based compensation expense	`ShareBasedCompensation`	$346.00M	USD	3 Qtrs
Share-based compensation expense	`ShareBasedCompensation`	$207.00M	USD	3 Qtrs
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$83.00M	USD	3 Qtrs
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-4.00M	USD	3 Qtrs
Fiduciary receivables	`IncreaseDecreaseInFiduciaryReceivables`	$1.05B	USD	3 Qtrs
Fiduciary receivables	`IncreaseDecreaseInFiduciaryReceivables`	$-359.00M	USD	3 Qtrs
Short-term investments funds held on behalf of clients	`IncreaseDecreaseInClientFundsHeld`	$706.00M	USD	3 Qtrs
Short-term investments funds held on behalf of clients	`IncreaseDecreaseInClientFundsHeld`	$786.00M	USD	3 Qtrs
Fiduciary liabilities	`IncreaseDecreaseInFiduciaryLiabilities`	$427.00M	USD	3 Qtrs
Fiduciary liabilities	`IncreaseDecreaseInFiduciaryLiabilities`	$1.76B	USD	3 Qtrs
Receivables, net	`IncreaseDecreaseInReceivables`	$79.00M	USD	3 Qtrs
Receivables, net	`IncreaseDecreaseInReceivables`	$-193.00M	USD	3 Qtrs
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$22.00M	USD	3 Qtrs
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-191.00M	USD	3 Qtrs
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$47.00M	USD	3 Qtrs
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$34.00M	USD	3 Qtrs
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-101.00M	USD	3 Qtrs
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-117.00M	USD	3 Qtrs
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-250.00M	USD	3 Qtrs
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-113.00M	USD	3 Qtrs
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$2.02B	USD	3 Qtrs
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.25B	USD	3 Qtrs
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$34.00M	USD	3 Qtrs
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$51.00M	USD	3 Qtrs
Payments for investments	`PaymentsToAcquireOtherInvestments`	$80.00M	USD	3 Qtrs
Payments for investments	`PaymentsToAcquireOtherInvestments`	$68.00M	USD	3 Qtrs
Net sales (purchases) of short-term investments non-fiduciary	`NetPurchasesOfShortTermInvestmentNonFiduciary`	$312.00M	USD	3 Qtrs
Net sales (purchases) of short-term investments non-fiduciary	`NetPurchasesOfShortTermInvestmentNonFiduciary`	$2.00M	USD	3 Qtrs
Acquisition of businesses, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$368.00M	USD	3 Qtrs
Acquisition of businesses, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$3.00M	USD	3 Qtrs
Sale of businesses, net of cash sold	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$8.00M	USD	3 Qtrs
Sale of businesses, net of cash sold	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$30.00M	USD	3 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$119.00M	USD	3 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$102.00M	USD	3 Qtrs
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-815.00M	USD	3 Qtrs
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-116.00M	USD	3 Qtrs
Share repurchase	`PaymentsForRepurchaseOfEquity`	$963.00M	USD	3 Qtrs
Share repurchase	`PaymentsForRepurchaseOfEquity`	$1.54B	USD	3 Qtrs
Issuance of shares for employee benefit plans	`PaymentForIssuanceOfSharesForEmployeeBenefitPlans`	$141.00M	USD	3 Qtrs
Issuance of shares for employee benefit plans	`PaymentForIssuanceOfSharesForEmployeeBenefitPlans`	$122.00M	USD	3 Qtrs
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$3.17B	USD	3 Qtrs
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$4.15B	USD	3 Qtrs
Repayment of debt	`RepaymentsOfLongTermDebt`	$2.44B	USD	3 Qtrs
Repayment of debt	`RepaymentsOfLongTermDebt`	$3.86B	USD	3 Qtrs
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$307.00M	USD	3 Qtrs
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$335.00M	USD	3 Qtrs
Noncontrolling interests and other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-31.00M	USD	3 Qtrs
Noncontrolling interests and other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-117.00M	USD	3 Qtrs
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-1.38B	USD	3 Qtrs
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-1.15B	USD	3 Qtrs
Effect of exchange rates on cash and cash equivalents	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-31.00M	USD	3 Qtrs
Effect of exchange rates on cash and cash equivalents	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-30.00M	USD	3 Qtrs
Net increase (decrease) in cash and cash equivalents	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$31.00M	USD	3 Qtrs
Net increase (decrease) in cash and cash equivalents	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-275.00M	USD	3 Qtrs
Cash and cash equivalents at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$884.00M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$821.00M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$790.00M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$609.00M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$884.00M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$821.00M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$790.00M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$609.00M	USD	Point-in-time
Interest paid	`InterestPaidNet`	$193.00M	USD	3 Qtrs
Interest paid	`InterestPaidNet`	$214.00M	USD	3 Qtrs
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$330.00M	USD	3 Qtrs
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$326.00M	USD	3 Qtrs

Stockholders Equity 89 line items

Line Item	Tag	Value	Unit	Period
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.51	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.44	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.44	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.46	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.51	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.44	USD	1 Quarter
Beginning Balance (in shares)	`CommonStockSharesIssued`	225.50M	shares	Point-in-time
Beginning Balance (in shares)	`CommonStockSharesIssued`	221.40M	shares	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.57B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.36B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.58B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$2.30B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.62B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.26B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.69B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.44B	USD	Point-in-time
Net income (loss)	`ProfitLoss`	$-891.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$1.48B	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$393.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$791.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$411.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$933.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$435.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$282.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-52.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$12.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-87.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$17.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-112.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-45.00M	USD	1 Quarter
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$463.00M	USD	1 Quarter
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$1.25B	USD	1 Quarter
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$50.00M	USD	1 Quarter
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$500.00M	USD	1 Quarter
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$242.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$130.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$131.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$81.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$67.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$85.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$64.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$104.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$102.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$103.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$115.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$102.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$116.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-5.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$5.00M	USD	3 Qtrs
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-5.00M	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`	$11.00M	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`	$4.00M	USD	3 Qtrs
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$6.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-108.00M	USD	3 Qtrs
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$173.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$115.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-153.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-397.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$88.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-70.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-136.00M	USD	3 Qtrs
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-23.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-20.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-25.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-33.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-24.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-87.00M	USD	3 Qtrs
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-29.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-67.00M	USD	3 Qtrs
Purchases of subsidiary shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$14.00M	USD	1 Quarter
Purchases of subsidiary shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$9.00M	USD	1 Quarter
Purchases of subsidiary shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	-	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$23.00M	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$10.00M	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$1.00M	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$7.00M	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$24.00M	USD	1 Quarter
Ending Balance (in shares)	`CommonStockSharesIssued`	225.50M	shares	Point-in-time
Ending Balance (in shares)	`CommonStockSharesIssued`	221.40M	shares	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.57B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.36B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.58B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$2.30B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.62B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.26B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.69B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.44B	USD	Point-in-time

Comprehensive Income 56 line items

Line Item	Tag	Value	Unit	Period
Net income (loss)	`ProfitLoss`	$-891.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$1.48B	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$393.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$791.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$411.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$933.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$435.00M	USD	3 Qtrs
Net income (loss)	`ProfitLoss`	$282.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$43.00M	USD	3 Qtrs
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$39.00M	USD	3 Qtrs
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$9.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$7.00M	USD	1 Quarter
Net income (loss) attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$275.00M	USD	1 Quarter
Net income (loss) attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$392.00M	USD	3 Qtrs
Net income (loss) attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$-900.00M	USD	1 Quarter
Net income (loss) attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.45B	USD	3 Qtrs
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-5.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$5.00M	USD	3 Qtrs
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-5.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$3.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$11.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-1.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$4.00M	USD	3 Qtrs
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$6.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-108.00M	USD	3 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$173.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$115.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-153.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-397.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$88.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-70.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-136.00M	USD	3 Qtrs
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-23.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-20.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-25.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-33.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-24.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-87.00M	USD	3 Qtrs
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-29.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-67.00M	USD	3 Qtrs
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-65.00M	USD	3 Qtrs
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-16.00M	USD	3 Qtrs
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$199.00M	USD	1 Quarter
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-133.00M	USD	1 Quarter
Less: Other comprehensive income attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$2.00M	USD	1 Quarter
Less: Other comprehensive income attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	3 Qtrs
Less: Other comprehensive income attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$1.00M	USD	3 Qtrs
Less: Other comprehensive income attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-133.00M	USD	1 Quarter
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-66.00M	USD	3 Qtrs
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$197.00M	USD	1 Quarter
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-16.00M	USD	3 Qtrs
Comprehensive income (loss) attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$-1.03B	USD	1 Quarter
Comprehensive income (loss) attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$472.00M	USD	1 Quarter
Comprehensive income (loss) attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$1.38B	USD	3 Qtrs
Comprehensive income (loss) attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$376.00M	USD	3 Qtrs

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