AON


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostsAndExpenses

us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestExpense

us-gaap:InterestPaidNet

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:OperatingIncomeLoss

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:ProductOrService
us-gaap:StatementGeographical

us-gaap:Revenues

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ShortTermInvestments

us-gaap:AccountsReceivableNetCurrent

us-gaap:OtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:LongTermInvestments

us-gaap:Goodwill
us-gaap:BusinessAcquisition

us-gaap:IntangibleAssetsNetExcludingGoodwill
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:DebtCurrent

us-gaap:LiabilitiesCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:LongTermDebt

us-gaap:LongTermDebtNoncurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:MinorityInterest

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:MinorityInterest

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

aon:AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther

aon:AccountsReceivableAllowanceForCreditLossWriteoffNetOfRecoveries
us-gaap:SubsequentEventType
aon:BusinessCombinationTerminationFees
us-gaap:CapitalizedContractCost
aon:CapitalizedContractCostAdditions
us-gaap:CapitalizedContractCost
aon:CapitalizedContractCostForeignCurrencyAndOtherAdjustmentsNet

aon:CashAndCashEquivalentsAndShortTermInvestmentsPeriodIncreaseDecrease
us-gaap:RetirementPlanSponsorLocation
aon:DefinedBenefitPlanNetPeriodicBenefitCostBeforeRecognizedNetGainLossDueToSettlementsAndCurtailments

aon:GainLossOnSaleofBusinessAndInvestmentsNet

aon:IncomeLossFromContinuingOperationsBeforeIncomeTaxes

aon:IncreaseDecreaseInFiduciaryLiabilities

aon:IncreaseDecreaseInFiduciaryReceivables

aon:NetPurchasesOfShortTermInvestmentNonFiduciary

aon:OtherGeneralExpenses

aon:PaymentForIssuanceOfSharesForEmployeeBenefitPlans
us-gaap:SubsequentEventType
aon:PaymentForRegulatoryTerminationFee

aon:ProceedsPaymentTowardsIssuanceofSharesUnderIncentiveandSharebasedCompensationPlansNetofPaymentsRelatedtoTaxWithholdingforSharebasedCompensation
us-gaap:AwardType
aon:ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable
us-gaap:ShortTermDebtType
aon:ShortTermDebtAverageOutstandingAmountWeightedAverageInterestRate
us-gaap:ShareRepurchaseProgram
aon:TreasuryStockAcquiredAdditionalTransactionCosts
us-gaap:ShareRepurchaseProgram
aon:TreasuryStockValueAcquiredCostMethodIncludingAssociatedAcquisitionCosts
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferred1
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred
us-gaap:CapitalizedContractCost
us-gaap:CapitalizedContractCostAmortization
us-gaap:DerivativeInstrumentRisk
us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:DeferredIncomeTaxesAndTaxCredits
us-gaap:RetirementPlanSponsorLocation
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanSponsorLocation
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:DefinedBenefitPlanContributionsByEmployer
us-gaap:RetirementPlanSponsorLocation
us-gaap:RetirementPlanSponsorLocation
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanSponsorLocation
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanSponsorLocation
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanSponsorLocation
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:Depreciation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:GainLossOnSaleOfInvestments

us-gaap:GoodwillForeignCurrencyTranslationGainLoss

us-gaap:GoodwillWrittenOffRelatedToSaleOfBusinessUnit
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:ImpairmentOfIntangibleAssetsFinitelived

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTax

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable

us-gaap:IncreaseDecreaseInClientFundsHeld

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInRestructuringReserve

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InformationTechnologyAndDataProcessing

us-gaap:InvestmentIncomeInterestAndDividend

us-gaap:LaborAndRelatedExpense
us-gaap:LitigationCase, us-gaap:LitigationStatus
us-gaap:LossContingencyDamagesSoughtValue

us-gaap:MinorityInterestDecreaseFromRedemptions
us-gaap:StatementEquityComponents

us-gaap:OccupancyNet

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
us-gaap:StatementEquityComponents
us-gaap:DerivativeInstrumentRisk
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax
us-gaap:DerivativeInstrumentRisk
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
us-gaap:StatementEquityComponents

us-gaap:PaymentsForRepurchaseOfEquity

us-gaap:PaymentsForRestructuring
us-gaap:BusinessAcquisition
us-gaap:PaymentsToAcquireBusinessesGross

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireOtherInvestments

us-gaap:PensionExpense

us-gaap:ProceedsFromDivestitureOfBusinessesNetOfCashDivested

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodTax
us-gaap:StatementEquityComponents

us-gaap:RestructuringReserveTranslationAdjustment
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
us-gaap:ShortTermDebtType
us-gaap:ShorttermDebtAverageOutstandingAmount
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:ShareRepurchaseProgram
us-gaap:TreasuryStockAcquiredAverageCostPerShare
us-gaap:ShareRepurchaseProgram
us-gaap:TreasuryStockSharesAcquired
us-gaap:StatementEquityComponents

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:ShareRepurchaseProgram
us-gaap:StatementEquityComponents
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
aon:BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:BusinessAcquisition
aon:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill
us-gaap:IncomeTaxAuthority
aon:CapitalLossCarryforwards

aon:CashAndCashEquivalentsAndShortTermInvestments

aon:CashandCashEquivalentsandShortTermInvestments

aon:DeferredTaxAssetsLeaseGuarantees

aon:DeferredTaxAssetsLeaseLiability

aon:DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards

aon:DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment

aon:DeferredTaxLiabilitiesLeaseRightofUseAsset

aon:DeferredTaxLiabilitiesOtherAccruedExpenses
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
aon:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationUnderlyingPriceInflation
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
aon:DefinedBenefitPlanMarketRelatedValue

aon:DefinedBenefitPlanPercentageOfTotalPensionObligations

aon:DistributableReservesAvailableAmount

aon:EmployeeRelatedLiabilitiesNoncurrent

aon:EmployeerelatedLiabilitiesNoncurrent

aon:FiduciaryAssets

aon:FiduciaryAssetsPremiumTrustBalances

aon:FiduciaryLiabilities

aon:FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearOne

aon:FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncome

aon:FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncomeUndiscountedExcessAmount

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDue

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueAfterYearFive

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo

aon:FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:IncomeTaxAuthority
aon:InterestCarryforward
us-gaap:LitigationCase, us-gaap:LitigationStatus
aon:LossContingencyInvestmentLossesSufferedByPlaintiff

aon:OperatingAndFinanceLeaseLiability

aon:OperatingLeaseAndFinanceLeaseLiabilitiesNoncurrent

aon:OperatingLeaseAndFinanceLeaseLiabilityCurrent

aon:OperatingLeaseAndFinanceLeaseRightofUseAsset

aon:OtherTaxAssetsCurrent

aon:PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization
us-gaap:StatementGeographical

aon:RestrictedCashOperatingFunds
us-gaap:AwardType
aon:UnamortizedExpenseOnPerformanceBasedPlans

us-gaap:AccruedIncomeTaxesNoncurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:CumulativeEffectPeriodOfAdoption
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
us-gaap:CapitalizedContractCost
us-gaap:CapitalizedContractCostNet

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:ContractWithCustomerAssetNetCurrent

us-gaap:ContractWithCustomerAssetNetNoncurrent

us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:DebtInstrumentCarryingAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:DebtInstrumentRepurchasedFaceAmount

us-gaap:DebtLongtermAndShorttermCombinedAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredTaxAssetsDeferredIncome

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsInvestments

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesTaxDeferredIncome

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings

us-gaap:DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:Range, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:Range, us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:Range, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanEstimatedAmountOfPlanParticipantsFutureBenefitsCoveredByInsuranceContractsIssuedByEmployerOrRelatedParties
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanSponsorLocation
us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:DerivativeAssets
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:BalanceSheetLocation
us-gaap:DerivativeFairValueOfDerivativeAsset
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation
us-gaap:BalanceSheetLocation
us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:DerivativeLiabilities
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:AwardType

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:DisposalGroupClassification, us-gaap:GuaranteeObligationsByNature, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:GuaranteeObligationsCurrentCarryingValue

us-gaap:GuaranteeObligationsMaximumExposure
us-gaap:DisposalGroupClassification, us-gaap:GuaranteeObligationsByNature, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:IncomeTaxesReceivableNoncurrent

us-gaap:LesseeFinanceLeaseDiscountRate

us-gaap:LesseeOperatingLeaseDiscountRate

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LettersOfCreditOutstandingAmount
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LongTermDebtFairValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
us-gaap:Range
us-gaap:LossContingencyEstimateOfPossibleLoss
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards

us-gaap:OtherAccruedLiabilitiesNoncurrent

us-gaap:OtherAssetsMiscellaneousCurrent

us-gaap:OtherAssetsMiscellaneousNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:OtherInvestments
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:PrepaidExpenseCurrent

us-gaap:RestrictedCashAndInvestmentsCurrent

us-gaap:RestructuringReserve

us-gaap:SecuredDebtCurrent
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:ShortTermDebtType
us-gaap:ShortTermBorrowings

us-gaap:ShorttermDebtFairValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:ShareRepurchaseProgram
us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Other Nonoperating Income Expense
Balance Sheet
Short Term Investments
Assets
Property Plant And Equipment Net
Current Assets
Other Assets Current
NonCurrent Assets
Long Term Investments
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Current Liabilities
Debt Current
Noncurrent Liabilities
Minority Interest
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Share Based Compensation
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Common Stock Shares Issued
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Undiscounted Excess Amount
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CommonStockValue ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁██████2.02.02.02.02.02.02.02.02.02.02.02.02.02.02.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.0386.0386.0386.0386.0386.0386.0NANANA363.0NANANA
us-gaap:CommonStockSharesIssued ▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▃▃▃▃▃▃▃▃▃▃▄▄▄▄▄▅▄▅▅▅██████225.6226.2225.5229.2231.5234.1232.1234.1235.7240.9240.1241.2243.0245.2247.6250.8255.7262.8262.0263.5265.8264.8269.8273.9279.8281.7280.0285.1290.5296.5300.7301.0307.5301.9310.9318.7322.4386.4386.4386.4386.3386.3385.9NANANA362.7NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█228.0228.1NA233.5233.6234.5NA239.1242.8243.7NA245.6247.4250.2NA257.3262.4267.0NA269.6269.8273.7NA283.8286.7287.1NA296.1301.6307.2NA312.9317.1320.0NA331.0335.6336.6NA336.9342.7345.4NA282.2282.6283.4NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█227.0227.1NA232.6232.7233.2NA236.9240.6242.2NA244.0246.0248.5NA255.6262.4264.8NA267.5268.0271.7NA280.9284.5284.2NA292.3298.5303.5NA309.5313.7316.4NA327.3332.0332.4NA332.6337.7339.4NA278.7278.4275.9NANANANA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount █▁0.20.1NANA0.10.0NA0.00.00.1NA0.00.00.1NA0.01.90.0NA0.00.00.5NA0.00.00.0NA0.00.00.0NA0.00.00.2NA0.11.11.0NA1.00.11.0NA5.14.05.0NANANANA
us-gaap:EarningsPerShareBasic ▄█▅▃▄▇▄▃▃▆▄▂▁▅▁▂▆▃▄▃▃▃▅▃▂▃▄▃▃▃▃▃▂▃▃▂▂▂▃▂▂▂▂▂▂▂▂▂▂▃1.674.022.28000000000000021.181.713.311.590.941.152.721.420.60.22.39-0.080.722.931.11.71.151.011.162.09999999999999961.050.631.151.61.061.021.071.150.830.770.820.950.620.740.720.850.590.760.720.680.520.550.650.710.420.520.99
us-gaap:EarningsPerShareDiluted ▄█▅▃▄▇▄▃▃▆▄▂▁▅▁▂▆▃▄▃▃▃▅▃▂▃▄▃▃▃▃▃▂▃▃▂▂▂▃▂▂▂▂▂▂▂▂▂▂▃1.664.02.26999999999999961.181.73.291.580.931.142.71.410.60.192.37-0.070.722.931.091.681.141.011.152.081.040.621.141.561.041.011.061.13999999999999970.820.760.820.930.620.730.710.830.590.750.710.670.510.540.630.690.410.510.96
us-gaap:IncomeLossFromContinuingOperationsPerBasicShare NANA2.28e-061.18e-061.71e-063.31e-061.59e-069.399999999999999e-071.15e-062.7200000000000002e-061.1399999999999999e-066.1e-071.9e-072.37e-064e-087.4e-07-2.0000000000000002e-079.499999999999999e-071.7e-061.19e-061.12e-061.2e-062.12e-061.0500000000000001e-066.3e-071.15e-061.6000000000000001e-061.06e-061.02e-061.0700000000000001e-061.16e-068.3e-077.7e-078.2e-079.499999999999999e-076.2e-077.4e-077.2e-078.4e-075.9e-077.6e-077.2e-076.800000000000001e-075.2e-076.4e-076.5e-075.1e-074.1e-075.2e-078.100000000000001e-07
us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare NANA2.2699999999999994e-061.18e-061.7e-063.29e-061.5800000000000001e-069.300000000000001e-071.1399999999999999e-062.7e-061.13e-066.1e-071.9e-072.35e-064e-087.3e-07-2.0000000000000002e-079.399999999999999e-071.68e-061.18e-061.1100000000000002e-061.19e-062.09e-061.0500000000000001e-066.2e-071.1399999999999999e-061.56e-061.04e-061.01e-061.06e-061.1399999999999999e-068.2e-077.6e-078.2e-079.300000000000001e-076.2e-077.3e-077.1e-078.2e-075.9e-077.5e-077.1e-076.7e-075.1e-076.3e-076.3e-074.9e-074.0000000000000003e-075e-077.900000000000001e-07
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 TTM Greenblatt ROC _ _▅█▅▄▅▇▄▃▄▆▄▃▂▆▄▃▁▃▅▄▄▄▅▄▃▄▅▄▄▄▄▃▄▄▄▃▄▄▄▃▄▄▄▃▃▃▃672.01245.0713.0441.0594.01033.0524.0360.0413.0872.0499.0262.0-16.0799.0489.0265.0-118.0343.0568.0422.0405.0450.0717.0413.0277.0441.0635.0417.0445.0469.0515.0364.0382.0410.0461.0339.0394.0402.0435.0341.0434.0396.0422.0263.0268.0273.0241.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AllocatedShareBasedCompensationExpense ▄█▆▃▃▄▃▃▅▅▇▃▃▄▆▃▃▄▆▃▃▄▆▄▃▅▄▃▃▆▅▃▃▃▂▂▂▂▂▂▁▃▂▁▂▃85.0131.0105.067.064.076.065.072.091.089.0124.067.070.077.0105.067.069.078.0103.072.071.085.0100.075.074.090.081.072.073.0102.093.070.068.069.052.055.050.055.056.059.047.074.055.043.057.066.0NANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▆█▇▅▆▅▅▃▄█▃▃▁█▂▅█▅▅▄▄▃▆▃▅▃▂▃▅▅▆▅▄▃▂▅▃▅▆▁▃▄▆▄▂▂526.0883.0762.0472.0511.0396.0371.029.0180.0828.068.039.0-285.0900.0-103.0450.0842.0453.0383.0236.0260.028.0614.078.0369.035.0-157.09.0406.0379.0617.0427.0209.096.0-55.0386.053.0369.0509.0-202.016.0203.0502.0217.0-90.0-152.0NANANANA
us-gaap:CostsAndExpenses ▅▅▅▃▃▅▆▄▅▅▅▄▇▆▆▄▇▄█▆▆▆▇▆▇▆█▇▇▇█▆▇▇█▆▆▆▇▆▆▆▇▁▂▂2214.02280.02252.01944.01903.02186.02361.02019.02193.02271.02271.02087.02577.02291.02420.02075.02486.02038.02694.02324.02361.02342.02571.02329.02528.02406.02664.02463.02474.02478.02694.02430.02515.02505.02654.02398.02427.02439.02559.02382.02377.02363.02487.01538.01630.01631.0NANANANA
us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal 1.0NA0.00.00.025.05.01.02.05.0-2.0-3.00.0-1.0-14.00.00.0-2.0-2.00.06.035.062.00.01.019.0-1.025.00.00.010.00.0NANANANANANA1.00.0-1.0NA-2.0-8.02.0NANANANANA
us-gaap:GainsLossesOnExtinguishmentOfDebt NANA0.00.0-7.0NANANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA0.00.0-19.0NANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▁█596.01167.0NANA496.0980.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest NANA534.0281.0410.0792.0382.0229.0287.0676.0284.0155.057.0604.017.0196.0-43.0265.0384.0314.0280.0327.0590.0303.0188.0341.0467.0315.0313.0336.0360.0264.0252.0272.0307.0210.0255.0249.0280.0208.0265.0253.0242.0147.0184.0186.0162.0131.0153.0235.0
us-gaap:IncomeTaxExpenseBenefit ▆▆▄▄▄▅▄▄▄▅▅▃▁▄█▃▁▃▄▄▄▄▄▄▃▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄203.0234.092.082.085.0189.059.056.056.0126.0137.039.0-144.0114.0389.04.0-143.00.062.048.055.074.0112.049.026.080.0114.075.067.078.0115.089.090.096.0103.064.096.097.0104.084.087.0103.0118.061.060.061.0NANANANA
us-gaap:IncomeTaxesPaidNet ▃▂▂▃▂▂▂▂▃▂▂▂▃▂▄█▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▃▂▂▂▂▁▂▁▂▂▂▂▁165.074.0129.0224.049.053.074.082.0164.033.063.067.0149.058.0328.0746.050.058.065.064.048.041.069.062.072.046.057.076.0138.066.0115.093.089.0148.099.040.059.040.03.060.0-22.036.039.090.053.010.0NANANANA
us-gaap:InterestExpense ▇▇▇▇█▇▇▇▆▆▆▆▆▆▆▆▆▆▆▆▆▆▅▆▅▅▅▅▅▄▄▄▃▃▄▄▄▄▄▄▅▅▅▃▁▁78.079.082.080.089.083.080.078.077.072.070.069.069.070.071.070.071.070.070.070.073.069.068.072.068.065.067.065.065.058.057.053.048.052.055.057.057.059.059.060.063.063.065.050.033.034.0NANANANA
us-gaap:InterestPaidNet █▂▇▂█▃▆▃█▁▆▁▅▃▅▃126.036.0112.038.0125.051.093.049.0120.027.094.027.087.058.077.051.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▆█▄▃▅█▃▃▄▇▃▃▄▆▃▃▄▆▃▃▃▅▃▃▄▅▃▃▄▄▂▃▄▄▁▃▃▄▁▄▄▄▄▁▂▃█▆▃▂14.020.010.07.013.019.08.06.010.017.08.06.010.016.07.07.09.014.07.07.08.012.06.08.010.013.08.06.09.011.05.08.011.011.02.06.08.011.03.010.09.09.010.03.05.08.020.014.06.05.0
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▄█▅▃▄▇▄▃▃▆▄▂▂▆▁▃▇▃▅▃▃▄▆▃▂▄▅▃▃▄▄▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂379.0913.0524.0275.0398.0772.0374.0222.0277.0659.0345.0147.048.0594.0-19.0185.0769.0291.0452.0307.0272.0315.0584.0295.0178.0328.0459.0309.0304.0325.0355.0256.0241.0261.0305.0204.0246.0238.0277.0198.0258.0246.0231.0144.0153.0178.0NANANANA
us-gaap:OperatingIncomeLoss ▅█▅▄▅▇▄▃▄▆▄▃▂▆▄▃▁▃▅▄▄▄▅▄▃▄▅▄▄▄▄▃▄▄▄▃▄▄▄▃▄▄▄▃▃▃▃▃▃▃672.01245.0713.0441.0594.01033.0524.0360.0413.0872.0499.0262.0-16.0799.0489.0265.0-118.0343.0568.0422.0405.0450.0717.0413.0277.0441.0635.0417.0445.0469.0515.0364.0382.0410.0461.0339.0394.0402.0435.0341.0434.0396.0422.0263.0268.0273.0241.0194.0220.0366.0
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▆▄█▆▅▂▆▃▄▆▃▄▁▇▄▇▅▆▃▄▄▄▄▃▆▂▂▂▅▅▅▆▄▃▅▆▃▆115.0-70.0399.0173.088.0-397.0196.0-212.0-103.0133.0-181.0-50.0-460.0247.0-44.0243.044.0147.0-268.0-89.0-59.0-79.0-66.0-229.0175.0-322.0-279.0-318.074.016.012.0155.0-58.0-174.038.0164.0-197.0104.0NANANANANANANANANANANANA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▇▅▇▇▇▃▆▄▅▇▄▅▃█▅█▆▇▅▅▆▄▆▄▇▃▁▃▆▆█▇▅▄147.0-30.0240.0199.0114.0-378.0-1.0-197.0-97.0171.0-275.0-111.0-339.0309.0-82.0272.068.0163.0-121.0-71.0-12.0-287.024.0-221.0190.0-293.0-619.0-300.0102.054.0261.0173.0-34.0-165.0NANA-196.0132.0NANANANANANANANANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▅▅▄▅▄▇▄▅▅▅▄▅▅▄▆▄▄▄▃▆▅▆▁▅▅█▆▇▅▅▆█▅▆▅▄▆▅▅▅▃▆▃▄▅▅-1.0-2.0-6.0-1.0-10.029.0-7.02.06.00.0-8.01.0-3.0-15.020.0-5.0-5.0-10.0-27.09.00.018.0-52.08.01.042.010.035.0-2.01.014.039.06.09.00.0-9.012.00.04.07.0-23.017.0-21.0-9.05.07.0NANANANA
us-gaap:ProfitLoss ▄█▅▃▄▇▄▃▃▆▄▂▂▆▁▃▇▃▄▃▃▄▅▃▂▄▅▃▃▄▄▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▃▂▂▃393.0933.0534.0282.0411.0791.0382.0228.0287.0676.0353.0153.058.0610.0-12.0192.0778.0305.0459.0314.0280.0327.0590.0303.0188.0341.0467.0315.0313.0336.0360.0264.0252.0272.0307.0210.0254.0249.0280.0208.0267.0255.0241.0147.0158.0186.0218.0134.0155.0285.0
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▂▂▂▁▂▂▂▁▂▂█▁▂▂▂▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁2886.03525.02965.02385.02497.03219.02885.02379.02606.03143.010770.02349.02561.03090.02909.02340.02368.02381.03262.02746.02766.02792.03288.02742.02805.02847.03299.02880.02919.02947.03209.02794.02897.02915.03115.02737.02821.02841.02994.02723.02811.02759.02909.01801.01898.01904.02073.01794.01882.01846.0
us-gaap:Revenues ▅█▆▃▄▇▅▃▄▆▅▃▄▆▆▃▃▃▇▅▅▅▇▅▅▅▇▅▆▆▇▅▅▆▆▅▅▅▆▅▅▅▆▁▁▁▂▁▁▁2886.03525.02965.02385.02497.03219.02885.02379.02606.03143.02770.02349.02561.03090.02909.02340.02368.02381.03262.02746.02766.02792.03288.02742.02805.02847.03299.02880.02919.02947.03209.02794.02897.02915.03115.02737.02821.02841.02994.02723.02811.02759.02909.01801.01898.01904.02073.01794.01882.01846.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets █▆▆▆▆▅▄▃▄▄▂▁▂▃▂▂▂▂▂▁▂▂▂▂▄▃▄▄▆▅▅▄▅▅▅▄▅▅▄▄▅▄▄34580.032175.032114.031359.031995.030282.029405.028167.029807.029135.026422.025602.027217.027847.026088.025924.027189.026982.026615.025252.026693.026813.027164.027206.029203.028389.029772.028827.031776.030077.030251.029305.030062.030029.030486.029509.030807.030271.029552.028745.030496.029802.028982.0NANANA22958.0NANANA
us-gaap:Liabilities █▆▇▆▇▆▅▄▅▄▃▂▃▃▂▂▂▂▂▁▂▂▂▂▃▃▃▂▄▃▃▂▃▃▃▂▃▂▂▁▃▂▂30013.027814.028531.027739.028300.027022.025956.024606.025894.024273.022203.021274.022599.022462.021440.020677.021636.021156.021083.019758.021132.021466.021001.021264.022747.021958.023141.021555.024017.022071.022056.021715.022444.022396.022681.021148.022597.021855.021432.020466.022031.021315.020676.0NANANA17527.0NANANA
us-gaap:LiabilitiesAndStockholdersEquity █▆▆▆▆▅▄▃▄▄▂▁▂▃▂▂▂▂▂▁▂▂▂▂▄▃▄▄▆▅▅▄▅▅▅▄▅▅▄▄▅▄▄34580.032175.032114.031359.031995.030282.029405.028167.029807.029135.026422.025602.027217.027847.026088.025924.027189.026982.026615.025252.026693.026813.027164.027206.029203.028389.029772.028827.031776.030077.030251.029305.030062.030029.030486.029509.030807.030271.029552.028745.030496.029802.028982.0NANANA22958.0NANANA
us-gaap:StockholdersEquity ▃▂▁▁▂▁▁▁▂▃▂▂▃▄▃▄▄▄▄▄▄▄▅▅▅▅▆▆▇▇█▇▇▇▇████████4462.04260.03495.03542.03601.03169.03375.03492.03836.04775.04151.04262.04545.05301.04583.05175.05487.05754.05475.05434.05499.05281.06106.05883.06398.06365.06571.07215.07700.07946.08145.07534.07559.07579.07762.08305.08152.08358.08078.08233.08398.08423.08251.0NANANA5379.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AssetsCurrent █▆▆▆▆▅▄▃▄▄▃▂▃▃▂▂▃▃▂▁▂▂▂▂▄▃▄▃▅▄▄▃▄▄▄▄▅▄▃▃▄▃▃21276.018905.018684.018249.018990.017345.016476.015317.016745.015919.014372.013348.014860.015115.013677.014267.015602.015393.013146.012471.013801.014041.013972.013920.015655.014999.015823.014755.017711.016173.016330.015574.016393.016257.016382.015702.017056.016207.015505.014500.015931.015211.014519.0NANANA13989.0NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue █▆▆▆▅▅▆▄▄▄▅▃▃▄▅▅▅▃▃▃▃▃▂▂▂▂▂▂▃▂▃▂▁▃▂▂▂▂▁▂▂▅▂▂▁▃▁1091.0822.0884.0821.0757.0690.0790.0602.0581.0600.0656.0484.0487.0597.0756.0749.0684.0433.0431.0483.0438.0465.0384.0398.0367.0378.0374.0382.0418.0338.0477.0369.0266.0408.0291.0290.0286.0323.0272.0295.0300.0682.0346.0335.0260.0422.0217.0NANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents █▅▆▅▄▃▅▂▂▂▃▁▁▂▄1091.0822.0884.0821.0757.0690.0790.0602.0581.0600.0656.0484.0487.0597.0756.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ShortTermInvestments ▁▁▂▂▂▁▁▁▁▁▁▁▁▁▂▅█▁▁▂▁▂▂▂▂▂▂▁▂▂▂▂▂▂▂▃▂▂▃▂▂▂▃289.0171.0308.0448.0654.0170.0138.0177.0235.0134.0172.0167.0173.0118.0529.01640.02746.0200.0290.0463.0251.0587.0356.0385.0484.0343.0394.0217.0308.0340.0523.0357.0307.0352.0346.0718.0516.0510.0785.0607.0515.0589.0785.0NANANA422.0NANANA
us-gaap:AccountsReceivableNetCurrent ██▆▅▇█▆▅▆▇▄▄▅▆▃▁▂▁▃▃▃▃▄▃▄▄▅▄▄▅▅▄▅▅▆▅▆▆▆▄▄▄▄3545.03526.03070.02906.03314.03554.03112.02866.03227.03242.02760.02656.02992.03053.02478.02068.02191.02103.02589.02391.02516.02591.02734.02453.02684.02672.02815.02630.02803.02880.02896.02666.02838.02884.03101.02959.03075.03164.03183.02745.02785.02650.02701.0NANANA2052.0NANANA
us-gaap:OtherAssetsCurrent ▃▂▃▂▂▃▃▃▃▃▃▄▄▃▁▂▂▁▁▂▂▃▃▄▄▄▃▄█▃▃▂▂▂▂▂▂▂▂▃▃▃▃547.0492.0624.0525.0471.0530.0602.0631.0631.0531.0618.0727.0732.0609.0289.0518.0399.0309.0351.0424.0395.0622.0566.0728.0731.0712.0602.0711.01396.0577.0563.0484.0406.0389.0430.0392.0443.0415.0427.0538.0571.0681.0624.0NANANA463.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:PropertyPlantAndEquipmentGross NANA1867.0NANANA1780.0NANANA1733.0NANANA1733.0NANANA2325.0NANANA2381.0NANANA2311.0NANANA2289.0NANANA2189.0NANANA1971.0NANANA1877.0NANANA1489.0NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType aon:FurnitureFixturesAndEquipmentNANA246.0NANANA225.0NANANA228.0NANANA240.0NANANA300.0NANANA315.0NANANA313.0NANANA323.0NANANA331.0NANANA326.0NANANA342.0NANANA258.0NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:ComputerEquipmentNANA249.0NANANA250.0NANANA279.0NANANA295.0NANANA417.0NANANA358.0NANANA347.0NANANA341.0NANANA332.0NANANA274.0NANANA245.0NANANA225.0NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:ComputerSoftwareIntangibleAssetNANA808.0NANANA727.0NANANA693.0NANANA680.0NANANA948.0NANANA1095.0NANANA1020.0NANANA997.0NANANA867.0NANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:ConstructionInProgressNANA155.0NANANA183.0NANANA154.0NANANA79.0NANANA93.0NANANA76.0NANANA94.0NANANA70.0NANANA109.0NANANA87.0NANANA45.0NANANA8.0NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LeaseholdImprovementsNANA375.0NANANA358.0NANANA334.0NANANA349.0NANANA452.0NANANA422.0NANANA413.0NANANA434.0NANANA426.0NANANA407.0NANANA436.0NANANA366.0NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:PropertyPlantAndEquipmentOtherTypesNANA34.0NANANA37.0NANANA45.0NANANA90.0NANANA115.0NANANA115.0NANANA124.0NANANA124.0NANANA124.0NANANANANANANANANANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA1268.0NANANA1159.0NANANA1145.0NANANA1169.0NANANA1560.0NANANA1616.0NANANA1546.0NANANA1498.0NANANA1369.0NANANA1188.0NANANA1096.0NANANA1028.0NANANA
us-gaap:AmortizationOfIntangibleAssets ▁█36.040.0NA50.058.097.0NA101.097.097.0101.0100.0282.0110.0100.0101.0460.043.070.072.068.067.077.078.079.080.089.090.087.086.099.098.099.099.0110.0105.0104.0104.089.091.091.091.068.030.029.027.0NANANANA
us-gaap:PropertyPlantAndEquipmentNet ▂▂▃▃▃▄▃▃▃▃▂▂▂▂▂▁▁▁▇▆▆▇▇▇▇▆▇▇▇▇▇█████▇█▇▇▇▇▇585.0584.0599.0609.0615.0666.0621.0606.0599.0606.0588.0594.0575.0578.0564.0545.0556.0536.0765.0738.0751.0766.0765.0785.0782.0754.0765.0760.0787.0785.0791.0803.0808.0816.0820.0814.0797.0808.0783.0773.0798.0791.0781.0NANANA461.0NANANA
us-gaap:LongTermInvestments ▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▃▃▃▃▃▃▃▃▄▄▄▄▃▄▃▃▄▄▄▄▅▅▆▆▆██78.074.074.059.051.052.053.052.054.055.054.052.054.058.057.044.0122.0121.0119.0124.0127.0131.0135.0136.0142.0143.0143.0143.0138.0143.0132.0139.0172.0152.0165.0160.0200.0211.0239.0254.0249.0318.0312.0NANANA319.0NANANA
us-gaap:Goodwill ▆▆▆▅▅▄▄▃▄▄▄▄▄▆▅▃▂▁▆▅▅▅▅▆▆▆▇████▇▇▇▇▇▆▇▇▇▇▇▆8659.08587.08666.08462.08356.08293.08165.08071.08198.08219.08171.08282.08291.08550.08358.07888.07745.07544.08747.08452.08473.08411.08448.08571.08661.08548.08860.09026.09099.09030.08997.08958.08795.08786.08943.08856.08713.08896.08770.08835.08975.08895.08647.0NANANA6078.0NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill NANA640.0NA699.0746.0783.0874.0973.01077.01149.01260.01363.01662.01733.01341.01402.01886.02223.02038.02107.02108.02180.02257.02350.02410.02520.02612.02468.02500.02578.02657.02736.02844.02975.03040.03106.03203.03276.03361.03484.03547.03611.0NANANA791.0NANANA
 us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass aon:CustomerRelatedAndContractBasedNANA562.0NA611.0637.0664.0698.0737.0781.0796.0848.0893.01119.01135.0724.0743.0816.01137.0968.01024.01020.01077.01146.01224.01278.01373.01452.01319.01343.01410.01468.01535.01633.01745.01797.01853.01931.01993.0NANANA2261.0NANANANANANANA
 us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass aon:MarketingTechnologyAndOtherNANA77.0NA85.088.046.050.055.061.066.069.073.080.084.054.045.071.088.051.064.069.084.092.0107.0113.0128.0141.0130.0138.0149.0164.0176.0186.0201.0215.0227.0245.0256.0NANANA323.0NANANANANANANA
 us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:TradeNamesNANA1.0NA3.021.073.0126.0181.0235.0287.0343.0397.0463.0514.0563.0614.0NA998.0NANANA1019.0NANANA1019.0NANANA1019.0NANANA4.0NANANA3.0NANANANANANANANANANANA
us-gaap:FiniteLivedIntangibleAssetsNet ▁▃▆█564.0594.0640.0665.0NANA783.0NANANANANANANANANANA887.01225.01019.01088.01089.01160.01238.01331.01391.01501.01593.01449.01481.01559.01632.01711.01819.01950.0NANANANANANANANANANANANANANANA
us-gaap:DeferredTaxAssetsLiabilitiesNet NANA462.0NANANA446.0NANANA380.0NANANA262.0NANANA221.0NANANA196.0NANANA41.0NANANA-182.0NANANA6.0NANANA-145.0NANANA-267.0NANANA808.0NANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▁▄▄▅▃▅▄▆█863.0867.0911.0914.0941.0897.0929.0913.0959.0993.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▂▂▂▂▃███▇▇▇▇▅▅▅▅▄▄▄▄▃▄▅▅▃546.0596.0610.0556.0548.0533.0570.0562.0521.0509.0448.0434.0404.0439.0307.0298.0368.0379.0554.0564.0576.0579.0625.01673.01755.01678.01517.01531.01573.01446.01230.01174.01158.01174.0916.0937.0935.0946.0721.01022.01059.01040.0807.0NANANA439.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent ▁▁▂▁▁▁▁▁▁▁█▁▁▁█▁▁▁▇▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁1692.01628.02016.01608.01488.01549.01939.01499.01369.01479.010166.01600.01447.01545.09625.01588.01423.01332.09485.01477.01373.01420.01772.01447.01368.01391.01805.01528.01498.01499.01931.01523.01423.01440.01853.01519.01339.01432.01832.01611.01557.01544.01810.0NANANA1535.0NANANA
us-gaap:AccruedIncomeTaxesCurrent ▂▂▁▂▂▂▁▂▂▂▁▁▁▂▂▄█▁▁▁▁▁▁▁▁▁▁▁▂▂▂100.0137.080.0134.0242.0196.093.0152.0133.0158.083.016.025.0164.0139.0537.01254.057.078.074.067.061.094.08.024.089.066.096.0115.0140.0184.0NANANA155.0NANANANANANANANANANANANANANANA
us-gaap:ContractWithCustomerLiabilityCurrent █▇▄▁▄▅▂▁▇▅▁▂▆355.0340.0296.0251.0294.0309.0270.0256.0337.0305.0251.0266.0332.0NA311.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DebtCurrent 13.0NA448.0472.0782.01884.0712.01148.0844.0426.0251.0741.0799.0403.0299.0305.0292.0667.0336.0250.0251.0695.0562.01327.01237.0966.0783.0660.0799.01077.0703.01206.0427.0802.0452.0291.0392.0286.0337.0163.052.0502.0492.0NANANA10.0NANANA
us-gaap:LiabilitiesCurrent █▆▇▆▇▆▅▄▅▄▃▂▃▃▂▂▃▂▂▁▂▂▃▃▄▄▄▃▅▅▅▅▅▅▅▃▅▄▃▂▃▃▂18927.016823.017433.016870.017383.017111.015571.014851.015481.014537.013296.012643.013843.013658.012755.012474.013375.012970.012495.011366.012697.012793.013086.013541.014839.014116.015014.013856.016040.015581.015411.015191.015195.015261.015350.013954.015200.014252.013760.012765.013987.013259.012949.0NANANA12640.0NANANA
us-gaap:OperatingLeaseLiabilityCurrent NANA204.0NANANA186.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent █▆▆▇▆▆▅▅▅▅▆██▄▃▃▄▃▃▄▃▃▂▃▃▃▂▁▂▁▁735.0602.0561.0632.0567.0572.0513.0537.0504.0516.0602.0706.0723.0479.0420.0421.0447.0378.0402.0442.0372.0402.0331.0401.0394.0364.0314.0281.0307.0261.0247.0NANANA241.0NANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent ▅▄▄▄▄▄▃▄▄▄▃▃▄▃▂▄█▂▂▃▂▂▂▂▂▂▂▂▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁1418.01301.01171.01241.01319.01277.01086.01163.01197.01220.0936.0988.01121.0972.0870.01289.02078.0773.0873.0929.0872.0902.0820.0811.0845.0865.0788.0853.0957.0967.0906.0764.0769.0795.0831.0801.0733.0739.0753.0676.0618.0604.0584.0NANANA260.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:LongTermDebt NANA7729.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent █████▆▇▆▇▆▆▅▅▅▅▅▅▅▅▆▆▆▄▄▄▃▄▄▄▂▂▁▂▂▂▂▂▂▂▃▃▃▂7272.07263.07281.07251.07229.06227.06627.06120.06740.05990.05993.05665.05659.05697.05667.05662.05631.05610.05869.05910.05907.05902.05175.04799.04824.04710.04799.04840.05155.03669.03686.03352.04012.03770.03713.04111.04098.04168.04155.04415.04479.04409.04014.0NANANA1998.0NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet █▅▅▄▃▃▃▄▄▄▃▅▅▄▂▁▁▂▁417.0293.0262.0223.0200.0189.0199.0209.0211.0205.0181.0273.0294.0243.0127.083.084.0112.0101.0NANANA37.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanSponsorLocation,us-gaap:RetirementPlanType aon:TheNetherlandsAndCanada,us-gaap:PensionPlansDefinedBenefitNANA123.0NANANA117.0NANANA111.0NANANA140.0NANANA146.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanSponsorLocation,us-gaap:RetirementPlanType country:GB,us-gaap:PensionPlansDefinedBenefitNANA21.0NANANA19.0NANANA16.0NANANA20.0NANANA34.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanSponsorLocation,us-gaap:RetirementPlanType country:US,us-gaap:PensionPlansDefinedBenefitNANA1052.0NANANA1076.0NANANA1035.0NANANA1154.0NANANA1175.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:MinorityInterest ██▆▅▇▆▅▄▅▆▄▄▄▆▄▄▄▄▃▃▃▄▃▃▃▄▃▃▃▃▂▃▃▂▁▃▃▃▁▁▄▃▂105.0101.088.078.094.091.074.069.077.087.068.066.073.084.065.072.066.072.057.060.062.066.057.059.058.066.060.057.059.060.050.056.059.054.043.056.058.058.042.046.067.064.055.0NANANA52.0NANANA
us-gaap:OtherLiabilitiesNoncurrent ▂▂▂▂▂▂▂▂▂▃▃▃▃▃▃▂▂▁▂▁▁▂▁▃▄▄▂▆▅▄▂▅▅▅▃▅▅▅▃███▄912.0905.0895.0888.0900.0930.0877.0953.0924.0973.01097.01090.01088.01105.01102.0846.0858.0733.0844.0759.0767.0838.0769.01091.01140.01131.0874.01422.01289.01248.0932.01399.01340.01338.01036.01326.01332.01363.01024.01743.01792.01798.01154.0NANANA871.0NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▁▄▅▆▅▆▅▇█841.0849.0897.0910.0947.0910.0944.0922.0962.0978.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA209.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA160.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA130.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA110.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA382.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:StockholdersEquity ▃▂▁▁▂▁▁▁▂▃▂▂▃▄▃▄▄▄▄▄▄▄▅▅▅▅▆▆▇▇█▇▇▇▇████████4462.04260.03495.03542.03601.03169.03375.03492.03836.04775.04151.04262.04545.05301.04583.05175.05487.05754.05475.05434.05499.05281.06106.05883.06398.06365.06571.07215.07700.07946.08145.07534.07559.07579.07762.08305.08152.08358.08078.08233.08398.08423.08251.0NANANA5379.0NANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ▃▂▁▁▂▁▁▁▂▃▂▂▃▄▃▄▄▄▄▄▄▄▅▅▅▅▆▆▇▇█▇▇▇▇████████4567.04361.03583.03620.03695.03260.03449.03561.03913.04862.04219.04328.04618.05385.04648.05247.05553.05826.05532.05494.05561.05347.06163.05942.06456.06431.06631.07272.07759.08006.08195.07590.07618.07633.07805.08361.08210.08416.08120.08279.08465.08487.08306.0NANANA5431.0NANANA
us-gaap:CommonStockValue ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁██████2.02.02.02.02.02.02.02.02.02.02.02.02.02.02.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.0386.0386.0386.0386.0386.0386.0NANANA363.0NANANA
us-gaap:AdditionalPaidInCapitalCommonStock ████▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▃▃▃▃▂▂▂▁▁▁▁▁▁6381.06348.06312.06216.06144.06121.06152.06084.06002.05958.05965.05850.05772.05743.05775.05670.05587.05567.05577.05522.05434.05388.05409.05318.05226.05177.05097.05012.04933.04860.04785.04660.04560.04507.04436.04373.04279.03913.04021.03975.03946.03942.04000.0NANANA3215.0NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▂▂▁▁▂▁▁▁▂▂▂▂▂▃▂▃▃▄▄▃▃▃▄▄▄▄▄▄▅▅▅▅▅▅▅▆▆████▇▇1823.01801.01042.01423.01751.01455.01254.01436.01669.02555.02093.02042.02295.02747.02302.02914.03574.03934.03807.03702.03784.03600.04117.04015.04405.04612.04605.04718.04982.05403.05731.05507.05805.05844.05933.06179.06302.08770.08594.08377.08233.08039.07861.0NANANA7335.0NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▃▂▂▂▁▁▂▂▂▃▂▃▃▄▃▄▃▃▂▃▃▃▄▃▄▄▄▆▇▆▆▆▅▅▆▇▆▇▆▇██▇-3744.0-3891.0-3861.0-4099.0-4296.0-4409.0-4033.0-4030.0-3837.0-3740.0-3909.0-3632.0-3524.0-3191.0-3496.0-3412.0-3677.0-3750.0-3912.0-3793.0-3722.0-3710.0-3423.0-3453.0-3236.0-3427.0-3134.0-2518.0-2218.0-2320.0-2374.0-2636.0-2809.0-2775.0-2610.0-2250.0-2432.0-2239.0-2370.0-1900.0-1698.0-1714.0-1917.0NANANA-1675.0NANANA
us-gaap:MinorityInterest ██▆▅▇▆▅▄▅▆▄▄▄▆▄▄▄▄▃▃▃▄▃▃▃▄▃▃▃▃▂▃▃▂▁▃▃▃▁▁▄▃▂105.0101.088.078.094.091.074.069.077.087.068.066.073.084.065.072.066.072.057.060.062.066.057.059.058.066.060.057.059.060.050.056.059.054.043.056.058.058.042.046.067.064.055.0NANANA52.0NANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▁█85.0131.0NA67.064.081.0NA72.091.089.0124.067.070.077.0107.066.073.075.0103.073.070.085.0101.075.074.090.081.072.073.0102.093.070.068.069.052.055.050.055.056.058.047.074.0NANANANANANANANA
us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders █▁10.01.0NA23.07.0NANA10.020.0NA8.010.014.0NA10.08.0NANA8.09.0NANA6.03.017.01.06.08.010.00.07.07.0NANA10.011.05.01.09.015.0NANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▇▆▇▇█▅▇▇▅▃▇▆▅▄▅▂▄▄█▇▆▅█▇▄▄▇▆▅▃▆▆▅▃▆▆▅▃▁▄▆▆▃▃▅▆784.0561.0760.0804.0881.0338.0672.0802.0287.074.0711.0562.0273.0140.0381.0-147.0260.0240.0851.0711.0491.0273.0934.0710.0229.0136.0759.0550.0344.0-11.0649.0597.0333.054.0552.0598.0284.0-15.0-395.0252.0579.0582.0-7.0-89.0416.0467.0NANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▅▅▅▃▄▅▅▄▄▄▄▄▅▅▇█▅▃▄▅▄▅▅▄▅▄▄▄▅▄▄▄▄▅▄▄▅▆▄▄▄▄▁▃▄-129.0102.0136.0177.0-554.0-438.02.0-9.0-195.0-27.0-53.0-95.0-167.0346.0265.01033.01476.013.0-583.0-287.0115.0-199.048.015.0-203.02.0-283.0-316.0-102.0156.0-200.0-41.0-36.0-62.0245.0-161.0-129.0222.0433.0-57.0-305.0-257.0-270.0-1512.0-453.0-323.0NANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▃▂▂▄▄▃▃▄▄▃▃▄▃▃▂▁▄▄▃▃▄▂▃▄▄▃▄▄▄▄▃▃▅▃▃▄▄▄▄▃▄▅█▄▄-413.0-709.0-942.0-942.0-286.082.0-525.0-736.0-92.0-140.0-444.0-457.0-135.0-663.0-617.0-878.0-1512.0-258.0-271.0-371.0-640.0-4.0-979.0-582.0-33.0-95.0-430.0-254.0-189.0-260.0-297.0-447.0-392.0120.0-790.0-430.0-200.0-166.0-87.0-177.0-666.034.0260.01692.0-128.014.0NANANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect █▃▅▅▅▂▇▄▃▃▆▄▂▁269.0-62.063.064.067.0-100.0188.021.0-19.0-56.0172.0-3.0-110.0-159.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▃▃█▅▄▃▇▆▄▄▇█▁▅▅▆▆▄▆▅▅▄▆▅▃▄▅▆▅▅▅▆▆▄▅▄▆▅▆▄▆▆▅▆▅▅-145.0-155.0178.0-3.0-82.0-141.089.042.0-58.0-74.0137.0162.0-263.0-38.0-31.069.062.0-92.033.0-27.013.0-69.029.0-3.0-125.0-50.08.051.07.0-21.0-38.027.030.0-62.0-14.0-63.054.019.038.0-66.072.059.05.063.0-3.01.0NANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▇▆▇▇█▅▇▇▅▃▇▆▅▄▅▂▄▄█▇▆▅█▇▄▄▇▆▅▃▆▆▅▃▆▆▅▃▁▄▆▆▃▃▅▆784.0561.0760.0804.0881.0338.0672.0802.0287.074.0711.0562.0273.0140.0381.0-147.0260.0240.0851.0711.0491.0273.0934.0710.0229.0136.0759.0550.0344.0-11.0649.0597.0333.054.0552.0598.0284.0-15.0-395.0252.0579.0582.0-7.0-89.0416.0467.0NANANANA
us-gaap:ProfitLoss ▄█▅▃▄▇▄▃▃▆▄▂▂▆▁▃▇▃▄▃▃▄▅▃▂▄▅▃▃▄▄▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▃▂▂▃393.0933.0534.0282.0411.0791.0382.0228.0287.0676.0353.0153.058.0610.0-12.0192.0778.0305.0459.0314.0280.0327.0590.0303.0188.0341.0467.0315.0313.0336.0360.0264.0252.0272.0307.0210.0254.0249.0280.0208.0267.0255.0241.0147.0158.0186.0218.0134.0155.0285.0
us-gaap:ShareBasedCompensation ▄█▆▃▃▄▃▃▅▅▇▃▃▄▆▃▃▄▆▃▃▄▆▄▃▅▄▃▃▆▅▃▃▃▂▂▂▂▂▂▁▃▂▁▂▃85.0131.0105.067.064.076.065.072.091.089.0124.067.070.077.0105.066.070.078.0103.073.070.085.0101.075.074.090.081.072.073.0102.093.070.068.069.052.055.050.055.056.058.047.074.055.043.057.066.0NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▅▅▅▃▄▅▅▄▄▄▄▄▅▅▇█▅▃▄▅▄▅▅▄▅▄▄▄▅▄▄▄▄▅▄▄▅▆▄▄▄▄▁▃▄-129.0102.0136.0177.0-554.0-438.02.0-9.0-195.0-27.0-53.0-95.0-167.0346.0265.01033.01476.013.0-583.0-287.0115.0-199.048.015.0-203.02.0-283.0-316.0-102.0156.0-200.0-41.0-36.0-62.0245.0-161.0-129.0222.0433.0-57.0-305.0-257.0-270.0-1512.0-453.0-323.0NANANANA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▃▂▁▂▂▅▅▅▄▅▅▆▆▃▅▃▄▂▆▄▄▄▅▇▇▅▇▅▅▄▄▄▅▅▆▆▅▆█▄▃▄▅▃▃▂41.029.022.030.030.059.058.061.049.057.061.068.066.045.058.043.048.034.069.049.052.052.065.083.080.062.077.064.060.055.055.052.062.060.068.072.058.071.090.052.043.056.065.044.038.033.0NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▃▂▂▄▄▃▃▄▄▃▃▄▃▃▂▁▄▄▃▃▄▂▃▄▄▃▄▄▄▄▃▃▅▃▃▄▄▄▄▃▄▅█▄▄-413.0-709.0-942.0-942.0-286.082.0-525.0-736.0-92.0-140.0-444.0-457.0-135.0-663.0-617.0-878.0-1512.0-258.0-271.0-371.0-640.0-4.0-979.0-582.0-33.0-95.0-430.0-254.0-189.0-260.0-297.0-447.0-392.0120.0-790.0-430.0-200.0-166.0-87.0-177.0-666.034.0260.01692.0-128.014.0NANANANA
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▃▂▁▁▆▆▄▅█▃▆▅▆▃▁▁▃▄▃▃▄▄▆▄▅▃▄▃▇▄▃▅▆▄▂▁▂▁▁▁▄▂▄▆▁▁863.0250.00.00.02093.02060.01134.01359.02688.0871.01794.01408.01744.0808.03.00.0659.0992.0738.0673.01011.01045.01857.01049.01575.0870.0984.0931.02129.01195.0636.01356.01764.01150.0400.01.0257.075.0101.0103.01040.0429.01100.01730.00.075.0NANANANA
us-gaap:RepaymentsOfLongTermDebt ▄▃▁▂█▅▄▆▆▃▇▆▅▃▁▁▄▄▃▃▆▂█▄▅▃▄▅▄▄▄▅▇▃▃▁▂▁▂▁▅▁▃▁850.0650.025.0310.02206.01341.01083.01630.01534.0694.01919.01471.01323.0704.01.08.01040.0950.0637.0676.01457.0175.02238.0964.01210.0686.0845.01328.0916.0829.0809.01263.01892.0715.0650.0122.0165.0140.0165.019.01425.079.0735.04.0NANANANANANA
us-gaap:PaymentsOfDividendsCommonStock █▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▅▅▆▅▅▅▅▅▄▄▄▄▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁115.0104.0105.0103.0102.0102.0103.0104.0107.096.097.098.098.089.090.092.095.087.087.089.087.082.083.084.085.071.072.073.075.053.053.054.055.050.051.051.053.049.050.050.049.051.052.041.041.041.0NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2.02.02.02.02.02.02.02.02.02.02.02.02.02.02.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.0386386386386386386363
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.01.31.31.31.31.31.31.6

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value225226225229231234232234235240240241243245247250255262262263265264269273279281280285290296300301307301310318322386386386386386385362
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockSharesIssued us-gaap:StatementEquityComponents

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-312008-12-31
Value225226225229231231232234235240240241243245247250255262262263265264269273279281280285290296300301307309310318322386386385362361
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.098.7100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0102.4100.0100.0100.0100.0100.0100.0100.00.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value228228233233234239242243245247250257262267269269273283286287296301307312317320331335336336342345282282283
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value227227232232233236240242244246248255262264267268271280284284292298303309313316327332332332337339278278275
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value200000.0100000.0100000.0000100000.000100000.001900000.0000500000.000000000200000.0100000.01100000.01000000.01000000.0100000.01000000.05100000.04000000.05000000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.00.00.00.0100.00.00.0100.00.0100.00.00.00.0100.00.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value1.674.022.281.181.713.311.590.941.152.721.420.60.22.39-0.080.722.931.11.71.151.011.162.11.050.631.151.61.061.021.071.150.830.770.820.950.620.740.720.850.590.760.720.680.520.550.650.710.420.520.99
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value1.664.02.271.181.73.291.580.931.142.71.410.60.192.37-0.070.722.931.091.681.141.011.152.081.040.621.141.561.041.011.061.140.820.760.820.930.620.730.710.830.590.750.710.670.510.540.630.690.410.510.96
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Basic Share

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value2.281.181.713.311.590.941.152.721.140.610.192.370.040.74-0.20.951.71.191.121.22.121.050.631.151.61.061.021.071.160.830.770.820.950.620.740.720.840.590.760.720.680.520.640.650.510.410.520.81
Percentage of IncomeLossFromContinuingOperationsPerBasicShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Diluted Share

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value2.271.181.73.291.580.931.142.71.130.610.192.350.040.73-0.20.941.681.181.111.192.091.050.621.141.561.041.011.061.140.820.760.820.930.620.730.710.820.590.750.710.670.510.630.630.490.40.50.79
Percentage of IncomeLossFromContinuingOperationsPerDilutedShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value851311056764766572918912467707710567697810372718510075749081727310293706869525550555659477455435766
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.93.70.02.82.62.42.33.03.52.81.22.92.72.53.62.92.93.33.22.62.63.03.02.72.63.22.52.52.53.52.92.52.32.41.72.01.81.91.92.21.72.71.92.43.03.5

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

aon:EmployeeStockPurchasePlan


Allocated
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value2.04.03.01.04.02.02.03.02.01.03.03.02.04.03.02.04.03.02.04.02.02.03.02.01.02.02.02.02.0
Percentage of AllocatedShareBasedCompensationExpense2.43.14.51.65.32.82.23.43.01.43.94.52.95.14.22.84.74.02.74.42.82.72.92.91.52.93.64.03.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.00.10.10.10.10.10.00.10.10.10.20.10.10.10.10.10.10.10.10.10.10.00.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax aon:EmployeeStockPurchasePlan0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PerformanceShares


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value396162211914202839238024231664222119552525205028282136292839512827111615132.0
Percentage of AllocatedShareBasedCompensationExpense45.946.659.031.329.718.430.838.942.925.864.535.832.920.861.032.830.424.453.434.735.223.550.037.337.823.344.440.338.438.254.840.039.715.930.827.326.03.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.70.00.90.80.40.71.21.50.70.71.00.90.52.20.90.90.81.70.90.90.71.51.01.00.71.11.01.01.31.61.00.90.40.50.50.50.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:PerformanceShares0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RestrictedStockUnitsRSU


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value4466414344584342506341414658394246554544446148444465434143603940405534373449
Percentage of AllocatedShareBasedCompensationExpense51.850.439.064.268.876.366.258.354.970.833.161.265.775.337.162.766.770.543.761.162.071.848.058.759.572.253.156.958.958.841.957.158.879.765.467.368.089.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.51.90.01.81.81.81.51.81.92.00.41.71.81.91.31.81.92.31.41.61.62.21.51.61.62.31.31.41.52.01.21.41.41.91.11.41.21.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RestrictedStockUnitsRSU0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value526883762472511396371291808286839-285.0900-103.0450842453383236260286147836935-157.09.040637961742720996-55.038653369509-202.016203502217-90.0-152.0
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.225.00.019.820.512.312.91.26.926.30.61.7-11.129.1-3.519.235.619.011.78.69.41.018.72.813.21.2-4.80.313.912.919.215.37.23.3-1.814.11.913.017.0-7.40.67.417.312.0-4.7-8.0

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2214228022521944190321862361201921932271227120872577229124202075248620382694232423612342257123292528240626642463247424782694243025152505265423982427243925592382237723632487153816301631
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax76.764.70.081.576.267.981.884.984.272.321.188.8100.674.183.288.7105.085.682.684.685.483.978.284.990.184.580.885.584.884.184.087.086.885.985.287.686.085.985.587.584.685.685.585.485.985.7

Disposal Group Not Discontinued Operation Gain Loss On Disposal

us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal

us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal


Disposal
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
Value1.00.00.00.0255.01.02.05.0-2.0-3.00.0-1.0-14.00.00.0-2.0-2.00.06.035620.01.019-1.0250.00.010.00.01.00.0-1.0-2.0-8.02.0
Percentage of DisposalGroupNotDiscontinuedOperationGainLossOnDisposal100.00.00.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.00.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.00.00.0100.00.0100.00.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.80.20.00.10.2-0.0-0.10.0-0.0-0.50.00.0-0.1-0.10.00.21.31.90.00.00.7-0.00.90.00.00.30.00.00.0-0.0-0.1-0.40.1

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt


Gains
Period End2020-12-312020-09-302020-06-302019-06-302011-12-312011-09-302011-06-30
Value0.00.0-7.00.00.00.0-19.0
Percentage of GainsLossesOnExtinguishmentOfDebt0.00.0100.00.00.00.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.0-0.30.00.00.0-0.7

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value5961167496980
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.733.119.930.4

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value5342814107923822292876762841555760417196-43.0265384314280327590303188341467315313336360264252272307210255249280208265253242147184186162131153235
Percentage of IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.011.816.424.613.29.611.021.52.66.62.219.50.68.4-1.811.111.811.410.111.717.911.16.712.014.210.910.711.411.29.48.79.39.97.79.08.89.47.69.49.28.38.29.79.87.87.38.112.7

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value20323492828518959565612613739-144.01143894.0-143.00.0624855741124926801147567781158990961036496971048487103118616061
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.06.60.03.43.45.92.02.42.14.01.31.7-5.63.713.40.2-6.00.01.91.72.02.73.41.80.92.83.52.62.32.63.63.23.13.33.32.33.43.43.53.13.13.74.13.43.23.2

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value165741292244953748216433636714958328746505865644841696272465776138661159389148994059403.060-22.03639905310.0
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.72.10.09.42.01.62.63.46.31.00.62.95.81.911.331.92.12.42.02.31.71.52.12.32.61.61.72.64.72.23.63.33.15.13.21.52.11.40.12.2-0.81.31.35.02.80.5

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value78798280898380787772706969707170717070707369687268656765655857534852555757595960636365503334
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.72.20.03.43.62.62.83.33.02.30.62.92.72.32.43.03.02.92.12.52.62.52.12.62.42.32.02.32.22.01.81.91.71.81.82.12.02.12.02.22.22.32.22.81.71.8

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value126361123812551934912027942787587751
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.41.00.01.65.01.63.22.14.60.90.91.13.41.92.62.2

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value142010.07.013198.06.010.0178.06.010.0167.07.09.0147.07.08.0126.08.010.0138.06.09.0115.08.011112.06.08.0113.010.09.09.010.03.05.08.020146.05.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.60.00.30.50.60.30.30.40.50.10.30.40.50.20.30.40.60.20.30.30.40.20.30.40.50.20.20.30.40.20.30.40.40.10.20.30.40.10.40.30.30.30.20.30.41.00.80.30.3

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value37991352427539877237422227765934514748594-19.0185769291452307272315584295178328459309304325355256241261305204246238277198258246231144153178
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.125.90.011.515.924.013.09.310.621.03.26.31.919.2-0.77.932.512.213.911.29.811.317.810.86.311.513.910.710.411.011.19.28.39.09.87.58.78.49.37.39.28.97.98.08.19.3

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value67212457134415941033524360413872499262-16.0799489265-118.0343568422405450717413277441635417445469515364382410461339394402435341434396422263268273241194220366
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.335.30.018.523.832.118.215.115.827.74.611.2-0.625.916.811.3-5.014.417.415.414.616.121.815.19.915.519.214.515.215.916.013.013.214.114.812.414.014.114.512.515.414.414.514.614.114.311.610.811.719.8

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value115-70.039917388-397.0196-212.0-103.0133-181.0-50.0-460.0247-44.024344147-268.0-89.0-59.0-79.0-66.0-229.0175-322.0-279.0-318.0741612155-58.0-174.038164-197.0104
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.0-2.00.07.33.5-12.36.8-8.9-4.04.2-1.7-2.1-18.08.0-1.510.41.96.2-8.2-3.2-2.1-2.8-2.0-8.46.2-11.3-8.5-11.02.50.50.45.5-2.0-6.01.26.0-7.03.7

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312013-03-31
Value115-70.017187-395.0-208.0-103.0131-183.0-47.0-454.0244-46.023649146-174.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.098.898.999.598.1100.098.5101.194.098.798.8104.597.1111.499.3100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.0-2.07.23.5-12.3-8.7-4.04.2-1.7-2.0-17.77.9-1.610.12.16.1-6.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Other
Period End2020-09-302020-06-302020-03-312019-09-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2.01.0-2.0-4.02.02.0-3.0-6.03.02.07.0-5.01.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax1.21.10.51.91.5-1.16.01.31.2-4.52.9-11.40.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.0-0.1-0.20.10.0-0.1-0.20.10.10.3-0.20.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-302012-03-31
Value147-30.0240199114-378.0-1.0-197.0-97.0171-275.0-111.0-339.0309-82.027268163-121.0-71.0-12.0-287.024-221.0190-293.0-619.0-300.010254261173-34.0-165.0-196.0132
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.1-0.90.08.34.6-11.7-0.0-8.3-3.75.4-2.6-4.7-13.210.0-2.811.62.96.8-3.7-2.6-0.4-10.30.7-8.16.8-10.3-18.8-10.43.51.88.16.2-1.2-5.7-6.94.6

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.0-2.0-6.0-1.0-10.029-7.02.06.00.0-8.01.0-3.0-15.020-5.0-5.0-10.0-27.09.00.018-52.08.01.04210.035-2.01.014396.09.00.0-9.0120.04.07.0-23.017-21.0-9.05.07.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.10.0-0.0-0.40.9-0.20.10.20.0-0.10.0-0.1-0.50.7-0.2-0.2-0.4-0.80.30.00.6-1.60.30.01.50.31.2-0.10.00.41.40.20.30.0-0.30.40.00.10.3-0.80.6-0.7-0.50.30.4

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value39393353428241179138222828767635315358610-12.0192778305459314280327590303188341467315313336360264252272307210254249280208267255241147158186218134155285
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.626.50.011.816.524.613.29.611.021.53.36.52.319.7-0.48.232.912.814.111.410.111.717.911.16.712.014.210.910.711.411.29.48.79.39.97.79.08.89.47.69.59.28.38.28.39.810.57.58.215.4

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value14207.013196.010.0178.06.010.0167.07.09.0147.07.08.0126.08.010.0138.06.09.0115.08.011112.06.08.0113.010.09.09.0
Percentage of ProfitLoss3.62.12.53.22.42.63.52.52.33.917.22.6-58.33.61.24.61.52.22.93.71.02.65.33.81.71.92.93.31.43.04.44.00.72.93.14.41.14.83.43.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.60.30.50.60.30.40.50.10.30.40.50.20.30.40.60.20.30.30.40.20.30.40.50.20.20.30.40.20.30.40.40.10.20.30.40.10.40.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value37991327539877222227765934514748594-19.0185769291502307272315584295178328459309304325355256241261305204246238277198258246
Percentage of ProfitLoss96.497.997.596.897.697.496.597.597.796.182.897.4158.396.498.895.4109.497.897.196.399.097.494.796.298.398.197.196.798.697.095.696.099.397.196.995.698.995.296.696.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.125.911.515.924.09.310.621.03.26.31.919.2-0.77.932.512.215.411.29.811.317.810.86.311.513.910.710.411.011.19.28.39.09.87.58.78.49.37.39.28.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value288635252965238524973219288523792606314310770234925613090290923402368238132622746276627923288274228052847329928802919294732092794289729153115273728212841299427232811275929091801189819042073179418821846
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-4.0-7.0-6.0-2.0-5.0-3.0-3.0-5.0-11.0-1.0-2.0-5.0-1.0-5.0-4.00.024-10.0-12.0-10.0-11.0-11.0-7.0-18.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.2-0.3-0.1-0.2-0.1-0.1-0.2-0.1-0.0-0.1-0.2-0.0-0.2-0.20.00.7-0.4-0.4-0.4-0.3-0.4-0.2-0.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.2-0.3-0.1-0.2-0.1-0.1-0.2-0.1-0.0-0.1-0.2-0.0-0.2-0.20.00.7-0.4-0.4-0.4-0.3-0.4-0.2-0.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:ProductOrService

us-gaap:OperatingSegments, aon:DataSolutions


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value4404344683933974844194201105501431424-126.0491389386-216.0466405395
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.212.319.615.712.320.316.113.410.321.316.813.7-4.321.016.416.2-6.617.014.614.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.212.319.615.712.320.316.113.410.321.316.813.7-4.321.016.416.2-6.617.014.614.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aon:DataSolutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, aon:Health


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3075362822585022793174861596278309451538293312372532265281292
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.615.211.810.315.611.712.215.514.811.812.114.618.512.513.215.616.39.710.210.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.615.211.810.315.611.712.215.514.811.812.114.618.512.513.215.616.39.710.210.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aon:Health100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, aon:PCAdvisory


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value134912891042112611461057116711184652102911661184122691710429841094884990961
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax46.736.643.745.135.644.444.835.643.243.845.538.342.139.244.041.333.532.235.834.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax46.736.643.745.135.644.444.835.643.243.845.538.342.139.244.041.333.532.235.834.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aon:PCAdvisory100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, aon:Reinsurance


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value5009223214488482914207881563279380742359355344371329329332371
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.326.213.517.926.312.216.125.114.511.914.824.012.315.214.515.610.112.012.013.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.326.213.517.926.312.216.125.114.511.914.824.012.315.214.515.610.112.012.013.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aon:Reinsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, aon:Retirement


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2943512782743312712863361865263277294913289285268913260275259
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.210.011.711.010.311.411.010.717.311.210.89.531.412.412.011.328.09.59.99.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.210.011.711.010.311.411.010.717.311.210.89.531.412.412.011.328.09.59.99.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments aon:Retirement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical

aon:AmericasOtherthanUnitedStates


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value268250264200219228196256241226257203243237
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.37.18.98.48.87.16.810.89.27.22.48.69.57.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.37.18.98.48.87.16.810.89.27.22.48.69.57.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax aon:AmericasOtherthanUnitedStates100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:EuropeMiddleEastAndAfricaOtherThanUnitedKingdomAndIreland


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value4991091372404955266481
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.331.015.616.229.711.218.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.331.015.616.229.711.218.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax aon:EuropeMiddleEastAndAfricaOtherThanUnitedKingdomAndIreland100.0100.0100.0100.0100.0100.0100.0

country:GB


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value498530303332444500292358400452394264413484
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.315.010.213.917.815.510.115.015.314.43.711.216.115.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.315.010.213.917.815.510.115.015.314.43.711.216.115.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:GB100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

country:IE


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value393321192123161720
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.40.90.70.80.80.70.60.70.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.40.90.70.80.80.70.60.70.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:IE100.0100.0100.0100.0100.0100.0100.0100.0100.0

country:US


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value12631308152911691107122715001209114611611221121511251116
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax43.837.151.649.044.338.152.050.844.036.911.351.743.936.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax43.837.151.649.044.338.152.050.844.036.911.351.743.936.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:AsiaPacific


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value319313343293302286352273318295356268287274
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.18.911.612.312.18.912.211.512.29.43.311.411.28.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.18.911.612.312.18.912.211.512.29.43.311.411.28.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:AsiaPacific100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value28863525296523852497321928852379260631432770234925613090290923402368238132622746276627923288274228052847329928802919294732092794289729153115273728212841299427232811275929091801189819042073179418821846
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.025.7100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3458032175321143135931995302822940528167298072913526422256022721727847260882592427189269822661525252266932681327164272062920328389297722882731776300773025129305300623002930486295093080730271295522874530496298022898222958
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3001327814285312773928300270222595624606258942427322203212742259922462214402067721636211562108319758211322146621001212642274721958231412155524017220712205621715224442239622681211482259721855214322046622031213152067617527
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets86.886.488.888.588.589.288.387.486.983.384.083.183.080.782.279.879.678.479.278.279.280.177.378.277.977.377.774.875.673.472.974.174.774.674.471.773.472.272.571.272.271.571.376.3

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3458032175321143135931995302822940528167298072913526422256022721727847260882592427189269822661525252266932681327164272062920328389297722882731776300773025129305300623002930486295093080730271295522874530496298022898222958
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value44624260349535423601316933753492383647754151426245455301458351755487575454755434549952816106588363986365657172157700794681457534755975797762830581528358807882338398842382515379
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.913.210.911.311.310.511.512.412.916.415.716.616.719.017.620.020.221.320.621.520.619.722.521.621.922.422.125.024.226.426.925.725.125.225.528.126.527.627.328.627.528.328.523.4

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2127618905186841824918990173451647615317167451591914372133481486015115136771426715602153931314612471138011404113972139201565514999158231475517711161731633015574163931625716382157021705616207155051450015931152111451913989
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets61.558.858.258.259.457.356.054.456.254.654.452.154.654.352.455.057.457.049.449.451.752.451.451.253.652.853.151.255.753.854.053.154.554.153.753.255.453.552.550.452.251.050.160.9

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1091822884821757690790602581600656484487597756749684433431483438465384398367378374382418338477369266408291290286323272295300682346335260422217582584
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.22.62.82.62.42.32.72.11.92.12.51.91.82.12.92.92.51.61.61.91.61.71.41.51.31.31.31.31.31.11.61.30.91.41.01.00.91.10.91.01.02.31.20.00.00.00.90.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value1091822884821757690790602581600656484487597756
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.22.62.82.62.42.32.72.11.92.12.51.91.82.12.9

Short Term Investments

us-gaap:ShortTermInvestments

us-gaap:ShortTermInvestments


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value28917130844865417013817723513417216717311852916402746200290463251587356385484343394217308340523357307352346718516510785607515589785422
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.51.01.42.00.60.50.60.80.50.70.70.60.42.06.310.10.71.11.80.92.21.31.41.71.21.30.81.01.11.71.21.01.21.12.41.71.72.72.11.72.02.71.8

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value35453526307029063314355431122866322732422760265629923053247820682191210325892391251625912734245326842672281526302803288028962666283828843101295930753164318327452785265027012052
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.311.09.69.310.411.710.610.210.811.110.410.411.011.09.58.08.17.89.79.59.49.710.19.09.29.49.59.18.89.69.69.19.49.610.210.010.010.510.89.59.18.99.38.9

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5474926245254715306026316315316187277326092895183993093514243956225667287317126027111396577563484406389430392443415427538571681624463
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.51.91.71.51.82.02.22.11.82.32.82.72.21.12.01.51.11.31.71.52.32.12.72.52.52.02.54.41.91.91.71.41.31.41.31.41.41.41.91.92.32.22.0

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value186717801733173323252381231122892189197118771489
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.86.16.66.68.78.87.87.67.26.76.56.5

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

aon:FurnitureFixturesAndEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value246225228240300315313323331326342258
Percentage of PropertyPlantAndEquipmentGross13.212.613.213.812.913.213.514.115.116.518.217.3
Percentage of Assets0.80.80.90.91.11.21.11.11.11.11.21.1
Percentage of Assets aon:FurnitureFixturesAndEquipment0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ComputerEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value249250279295417358347341332274245225
Percentage of PropertyPlantAndEquipmentGross13.314.016.117.017.915.015.014.915.213.913.115.1
Percentage of Assets0.80.91.11.11.61.31.21.11.10.90.81.0
Percentage of Assets us-gaap:ComputerEquipment0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ComputerSoftwareIntangibleAsset


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value80872769368094810951020997867
Percentage of PropertyPlantAndEquipmentGross43.340.840.039.240.846.044.143.639.6
Percentage of Assets2.52.52.62.63.64.03.43.32.8
Percentage of Assets us-gaap:ComputerSoftwareIntangibleAsset0.00.00.00.00.00.00.00.00.0

us-gaap:ConstructionInProgress


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value155183154799376947010987458.0
Percentage of PropertyPlantAndEquipmentGross8.310.38.94.64.03.24.13.15.04.42.40.5
Percentage of Assets0.50.60.60.30.30.30.30.20.40.30.20.0
Percentage of Assets us-gaap:ConstructionInProgress0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LeaseholdImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value375358334349452422413434426407436366
Percentage of PropertyPlantAndEquipmentGross20.120.119.320.119.417.717.919.019.520.623.224.6
Percentage of Assets1.21.21.31.31.71.61.41.41.41.41.51.6
Percentage of Assets us-gaap:LeaseholdImprovements0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PropertyPlantAndEquipmentOtherTypes


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value34374590115115124124124
Percentage of PropertyPlantAndEquipmentGross1.82.12.65.24.94.85.45.45.7
Percentage of Assets0.10.10.20.30.40.40.40.40.4
Percentage of Assets us-gaap:PropertyPlantAndEquipmentOtherTypes0.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value126811591145116915601616154614981369118810961028
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.93.94.34.55.95.95.25.04.54.03.84.5

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3640505897101979710110028211010010146043707268677778798089908786999899991101051041048991919168302927
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value585584599609615666621606599606588594575578564545556536765738751766765785782754765760787785791803808816820814797808783773798791781461
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.71.81.91.91.92.22.12.22.02.12.22.32.12.12.22.12.02.02.92.92.82.92.82.92.72.72.62.62.52.62.62.72.72.72.72.82.62.72.62.72.62.72.72.0

Long Term Investments

us-gaap:LongTermInvestments

us-gaap:LongTermInvestments


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value78747459515253525455545254585744122121119124127131135136142143143143138143132139172152165160200211239254249318312319
Percentage of LongTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.40.40.40.50.50.50.50.50.50.50.50.50.40.50.40.50.60.50.50.50.60.70.80.90.81.11.11.4

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value865985878666846283568293816580718198821981718282829185508358788877457544874784528473841184488571866185488860902690999030899789588795878689438856871388968770883589758895864760785637
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets25.026.727.027.026.127.427.828.727.528.230.932.330.530.732.030.428.528.032.933.531.731.431.131.529.730.129.831.328.630.029.730.629.329.329.330.028.329.429.730.729.429.829.826.50.0

us-gaap:Goodwill us-gaap:BusinessAcquisition

aon:A2019And2020Acquisitions


Goodwillus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-31
Value314315315303
Percentage of Goodwill3.63.73.83.7
Percentage of Assets1.01.01.01.0
Percentage of Assets aon:A2019And2020Acquisitions0.00.00.00.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6406997467838749731077114912601363166217331341140218862223203821072108218022572350241025202612246825002578265727362844297530403106320332763361348435473611791
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.02.22.52.73.13.33.74.34.95.06.06.65.25.27.08.48.17.97.98.08.38.08.58.59.17.88.38.59.19.19.59.810.310.110.611.111.711.411.912.53.4

us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass

aon:CustomerRelatedAndContractBased


Intangible
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value56261163766469873778179684889311191135724743816113796810241020107711461224127813731452131913431410146815351633174517971853193119932261
Percentage of IntangibleAssetsNetExcludingGoodwill87.887.485.484.879.975.772.569.367.365.567.365.554.053.043.351.147.548.648.449.450.852.153.054.555.653.453.754.755.356.157.458.759.159.760.360.862.6
Percentage of Assets1.81.92.12.32.52.52.73.03.33.34.04.42.82.73.04.33.83.83.84.04.24.24.54.65.04.24.54.75.05.15.45.76.16.06.46.77.8
Percentage of Assets aon:CustomerRelatedAndContractBased0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aon:MarketingTechnologyAndOther


Intangible
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value778588465055616669738084544571885164698492107113128141130138149164176186201215227245256323
Percentage of IntangibleAssetsNetExcludingGoodwill12.012.211.85.95.75.75.75.75.55.44.84.84.03.23.84.02.53.03.33.94.14.64.75.15.45.35.55.86.26.46.56.87.17.37.67.88.9
Percentage of Assets0.20.30.30.20.20.20.20.20.30.30.30.30.20.20.30.30.20.20.30.30.30.40.40.40.50.40.50.50.60.60.60.70.70.70.80.91.1
Percentage of Assets aon:MarketingTechnologyAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TradeNames


Intangible
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1.03.021731261812352873433974635145636149981019101910194.03.0
Percentage of IntangibleAssetsNetExcludingGoodwill0.20.42.89.314.418.621.825.027.229.127.929.742.043.844.946.740.439.50.10.1
Percentage of Assets0.00.00.10.20.40.60.81.11.31.51.72.02.22.33.73.83.43.40.00.0
Percentage of Assets us-gaap:TradeNames0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value56459464066578388712251019108810891160123813311391150115931449148115591632171118191950
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.82.02.12.73.34.64.04.14.14.34.64.64.95.05.54.64.95.25.65.76.16.4

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

aon:CustomerRelatedAndContractBased


Finite
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312011-09-302011-06-302011-03-312010-12-31
Value5005235625836642065216522062261
Percentage of FiniteLivedIntangibleAssetsNet88.788.087.887.784.80.00.00.00.0
Percentage of Assets1.41.61.81.92.37.27.17.47.8
Percentage of Assets aon:CustomerRelatedAndContractBased0.00.00.00.00.00.00.00.00.0

aon:MarketingTechnologyAndOther


Finite
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312011-09-302011-06-302011-03-312010-12-31
Value6370778046269290312323
Percentage of FiniteLivedIntangibleAssetsNet11.211.812.012.05.90.00.00.00.0
Percentage of Assets0.20.20.20.30.20.91.01.01.1
Percentage of Assets aon:MarketingTechnologyAndOther0.00.00.00.00.00.00.00.00.0

us-gaap:TradeNames


Finite
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value1.01.01.02.073
Percentage of FiniteLivedIntangibleAssetsNet0.20.20.20.39.3
Percentage of Assets0.00.00.00.00.2
Percentage of Assets us-gaap:TradeNames0.00.00.00.00.0

Deferred Tax Assets Liabilities Net

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:DeferredTaxAssetsLiabilitiesNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value46244638026222119641-182.06.0-145.0-267.0808
Percentage of DeferredTaxAssetsLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.51.41.00.80.70.1-0.60.0-0.5-0.93.5

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value863867911914941897929913959993
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.72.82.92.93.03.23.23.23.4

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value54659661055654853357056252150944843440443930729836837955456457657962516731755167815171531157314461230117411581174916937935946721102210591040807439
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.91.91.81.71.81.92.01.71.71.71.71.51.61.21.11.41.42.12.22.22.22.36.16.05.95.15.35.04.84.14.03.93.93.03.23.03.12.43.63.53.52.81.9

Accounts Payable And Accrued Liabilities Current

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value169216282016160814881549193914991369147910166160014471545962515881423133294851477137314201772144713681391180515281498149919311523142314401853151913391432183216111557154418101535
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.95.16.35.14.75.16.65.34.65.138.56.25.35.536.96.15.24.935.65.85.15.36.55.34.74.96.15.34.75.06.45.24.74.86.15.14.34.76.25.65.15.26.26.7

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value100137801342421969315213315883162516413953712545778746761948.024896696115140184155
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.40.20.40.80.60.30.50.40.50.30.10.10.60.52.14.60.20.30.30.30.20.30.00.10.30.20.30.40.50.60.5

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:ContractWithCustomerLiabilityCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value355340296251294309270256337305251266332311
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.10.90.80.91.00.90.91.11.00.91.01.21.2

Debt Current

us-gaap:DebtCurrent

us-gaap:DebtCurrent


Debt
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value134484727821884712114884442625174179940329930529266733625025169556213271237966783660799107770312064278024522913922863371635250249210.0
Percentage of DebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.01.41.52.46.22.44.12.81.50.92.92.91.41.11.21.12.51.31.00.92.62.14.94.23.42.62.32.53.62.34.11.42.71.51.01.30.91.10.60.21.71.70.0

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1892716823174331687017383171111557114851154811453713296126431384313658127551247413375129701249511366126971279313086135411483914116150141385616040155811541115191151951526115350139541520014252137601276513987132591294912640
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets54.752.354.353.854.356.553.052.751.949.950.349.450.949.048.948.149.248.146.945.047.647.748.249.850.849.750.448.150.551.850.951.850.550.850.447.349.347.146.644.445.944.544.755.1

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2020-12-312019-12-31
Value204186
Percentage of OperatingLeaseLiabilityCurrent100.0100.0
Percentage of Assets0.60.6

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value735602561632567572513537504516602706723479420421447378402442372402331401394364314281307261247241
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.11.91.72.01.81.91.71.91.71.82.32.82.71.71.61.61.61.41.51.81.41.51.21.51.31.31.11.01.00.90.80.8

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1418130111711241131912771086116311971220936988112197287012892078773873929872902820811845865788853957967906764769795831801733739753676618604584260
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.14.03.64.04.14.23.74.14.04.23.53.94.13.53.35.07.62.93.33.73.33.43.03.02.93.02.63.03.03.23.02.62.62.62.72.72.42.42.52.42.02.02.01.1

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2020-12-31
Value7729
Percentage of LongTermDebt100.0
Percentage of Assets24.1

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value72727263728172517229622766276120674059905993566556595697566756625631561058695910590759025175479948244710479948405155366936863352401237703713411140984168415544154479440940141998
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets21.022.622.723.122.620.622.521.722.620.622.722.120.820.521.721.820.720.822.123.422.122.019.117.616.516.616.116.816.212.212.211.413.312.612.213.913.313.814.115.414.714.813.88.7

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value417293262223200189199209211205181273294243127838411210137
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.20.90.80.70.60.60.70.70.70.70.71.11.10.90.50.30.30.40.40.1

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value123117111140146
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.50.5
Percentage of Assets aon:TheNetherlandsAndCanada us-gaap:PensionPlansDefinedBenefit0.00.00.00.00.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2119162034
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent17.116.214.414.323.3
Percentage of Assets0.10.10.10.10.1
Percentage of Assets country:GB us-gaap:PensionPlansDefinedBenefit0.00.00.00.00.0

country:US, us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value10521076103511541175
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent855.3919.7932.4824.3804.8
Percentage of Assets3.33.73.94.44.4
Percentage of Assets country:US us-gaap:PensionPlansDefinedBenefit0.00.00.00.00.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value105101887894917469778768667384657266725760626657595866605759605056595443565858424667645552
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.30.20.30.30.30.20.30.30.30.30.30.30.20.30.20.30.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.10.20.20.20.10.20.20.20.20.2

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value91290589588890093087795392497310971090108811051102846858733844759767838769109111401131874142212891248932139913401338103613261332136310241743179217981154871
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.62.82.82.82.83.13.03.43.13.34.24.34.04.04.23.33.22.73.23.02.93.12.84.03.94.02.94.94.14.13.14.84.54.53.44.54.34.53.56.15.96.04.03.8

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value841849897910947910944922962978
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.42.62.82.93.03.03.23.33.23.4

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value209
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.7

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value160
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.5

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value130
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.4

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value110
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.3

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value382
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets1.2

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value11011130124513011330
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets3.43.84.44.44.6

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value1217
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets3.8

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value116
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.4

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value44624260349535423601316933753492383647754151426245455301458351755487575454755434549952816106588363986365657172157700794681457534755975797762830581528358807882338398842382515379
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.913.210.911.311.310.511.512.412.916.415.716.616.719.017.620.020.221.320.621.520.619.722.521.621.922.422.125.024.226.426.925.725.125.225.528.126.527.627.328.627.528.328.523.4

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value4567436135833620369532603449356139134862421943284618538546485247555358265532549455615347616359426456643166317272775980068195759076187633780583618210841681208279846584878306543154156261
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.213.611.211.511.510.811.712.613.116.716.016.917.019.317.820.220.421.620.821.820.819.922.721.822.122.722.325.224.426.627.125.925.325.425.628.326.627.827.528.827.828.528.723.70.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value-2755.0-2788.0-2817.0-2649.0-2669.0-2692.0-2716.0-2513.0-2530.0-2575.0-2592.0-2611.0-2627.0-2782.0-2522.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-60.3-63.9-78.6-73.2-72.2-82.6-78.7-70.6-64.7-61.0-55.8-47.2-42.6-42.0-30.8
Percentage of Assets-8.0-8.7-8.8-8.4-8.3-8.9-9.2-8.9-8.5-9.7-9.9-9.8-9.7-9.3-8.3
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value11121.0-8.0-14.0-17.0-12.0-18.0-16.0-15.0-25.0-37.0-25.0-17.0-21.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.20.30.0-0.2-0.4-0.5-0.3-0.5-0.4-0.4-0.5-0.7-0.4-0.3-0.3
Percentage of Assets0.00.00.0-0.0-0.0-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value-3744.0-3891.0-3861.0-4099.0-4296.0-4409.0-4033.0-4030.0-3837.0-3740.0-3909.0-3632.0-3524.0-3191.0-3496.0-3412.0-3677.0-3750.0-3912.0-3793.0-3722.0-3710.0-3423.0-3453.0-3236.0-3427.0-3134.0-2518.0-2218.0-2320.0-2374.0-2636.0-2809.0-2775.0-2610.0-2250.0-2432.0-2239.0-2370.0-1900.0-1698.0-1714.0-1917.0-1675.0-1462.0-726.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-82.0-89.2-107.8-113.2-116.3-135.2-116.9-113.2-98.1-76.9-92.7-83.9-76.3-59.3-75.2-65.0-66.2-64.4-70.7-69.0-66.9-69.4-55.5-58.1-50.1-53.3-47.3-34.6-28.6-29.0-29.0-34.7-36.9-36.4-33.4-26.9-29.6-26.6-29.2-22.9-20.1-20.2-23.1-30.8-27.0-11.6
Percentage of Assets-10.8-12.1-12.0-13.1-13.4-14.6-13.7-14.3-12.9-12.8-14.8-14.2-12.9-11.5-13.4-13.2-13.5-13.9-14.7-15.0-13.9-13.8-12.6-12.7-11.1-12.1-10.5-8.7-7.0-7.7-7.8-9.0-9.3-9.2-8.6-7.6-7.9-7.4-8.0-6.6-5.6-5.8-6.6-7.30.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value-1000.0-1115.0-1045.0-1442.0-1613.0-1700.0-1305.0-1499.0-1291.0-1319.0-879.0-1264.0-771.0-335.0169
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-21.9-25.6-29.2-39.8-43.7-52.1-37.8-42.1-33.0-31.3-18.9-22.8-12.5-5.12.1
Percentage of Assets-2.9-3.5-3.3-4.6-5.0-5.6-4.4-5.3-4.3-5.0-3.4-4.7-2.8-1.10.6
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value6383635063146218614661236154608660045960596758525774574557775673559055705580552554375391541253215229518051005015493648634788466345634510443943764282429944074361433243284386357835823425
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest139.8145.6176.2171.8166.3187.8178.4170.9153.4122.6141.4135.2125.0106.7124.3108.1100.795.6100.9100.697.8100.887.889.581.080.576.969.063.660.758.461.459.959.156.952.352.251.154.352.751.251.052.865.966.154.7
Percentage of Assets18.519.719.719.819.220.220.921.620.120.522.622.921.220.622.121.920.620.621.021.920.420.119.919.617.918.217.117.415.516.215.815.915.215.014.614.813.914.214.915.214.214.515.115.60.00.0
Percentage of Assets us-gaap:CommonStockIncludingAdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value10510188789491746977876866738465726672576062665759586660575960505659544356585842466764555210540
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest2.32.32.52.22.52.82.11.92.01.81.61.51.61.61.41.41.21.21.01.11.11.20.91.00.91.00.90.80.80.70.60.70.80.70.60.70.70.70.50.60.80.80.71.01.90.6
Percentage of Assets0.30.30.30.20.30.30.30.20.30.30.30.30.30.30.20.30.20.30.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.10.20.20.20.10.20.20.20.20.20.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value1823180110421423175114551254143616692555209320422295274723022914357439343807370237843600411740154405461246054718498254035731550758055844593361796302877085948377823380397861733568165607
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest39.941.329.139.347.444.636.440.342.752.649.647.249.751.049.555.564.467.568.867.468.067.366.867.668.271.769.464.964.267.569.972.676.276.676.073.976.8104.2105.8101.297.394.794.6135.1125.989.6
Percentage of Assets5.35.63.24.55.54.84.35.15.68.87.98.08.49.98.811.213.114.614.314.714.213.415.214.815.116.215.516.415.718.018.918.819.319.519.520.920.529.029.129.127.027.027.131.90.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2.02.02.02.02.02.02.02.02.02.02.02.02.02.02.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.0386386386386386386363
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.01.31.31.31.31.31.31.6

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value63816348631262166144612161526084600259585965585057725743577556705587556755775522543453885409531852265177509750124933486047854660456045074436437342793913402139753946394240003215
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.519.719.719.819.220.220.921.620.120.422.622.821.220.622.121.920.520.621.021.920.420.119.919.517.918.217.117.415.516.215.815.915.215.014.614.813.912.913.613.812.913.213.814.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value18231801104214231751145512541436166925552093204222952747230229143574393438073702378436004117401544054612460547184982540357315507580558445933617963028770859483778233803978617335
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.35.63.24.55.54.84.35.15.68.87.98.08.49.98.811.213.114.614.314.714.213.415.214.815.116.215.516.415.718.018.918.819.319.519.520.920.529.029.129.127.027.027.131.9

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value-3744.0-3891.0-3861.0-4099.0-4296.0-4409.0-4033.0-4030.0-3837.0-3740.0-3909.0-3632.0-3524.0-3191.0-3496.0-3412.0-3677.0-3750.0-3912.0-3793.0-3722.0-3710.0-3423.0-3453.0-3236.0-3427.0-3134.0-2518.0-2218.0-2320.0-2374.0-2636.0-2809.0-2775.0-2610.0-2250.0-2432.0-2239.0-2370.0-1900.0-1698.0-1714.0-1917.0-1675.0-1462.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-10.8-12.1-12.0-13.1-13.4-14.6-13.7-14.3-12.9-12.8-14.8-14.2-12.9-11.5-13.4-13.2-13.5-13.9-14.7-15.0-13.9-13.8-12.6-12.7-11.1-12.1-10.5-8.7-7.0-7.7-7.8-9.0-9.3-9.2-8.6-7.6-7.9-7.4-8.0-6.6-5.6-5.8-6.6-7.30.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value105101887894917469778768667384657266725760626657595866605759605056595443565858424667645552
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.30.20.30.30.30.20.30.30.30.30.30.30.20.30.20.30.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.10.20.20.20.10.20.20.20.20.2

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value85131676481729189124677077107667375103737085101757490817273102937068695255505556584774
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value85131676481729189124677077107667375103737085101757490817273102937068695255505556584774
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStockIncludingAdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Minority Interest Decrease From Distributions To Noncontrolling Interest Holders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders


Minority
Period End2021-06-302021-03-312020-09-302020-06-302019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value10.01.0237.010.0208.010.01410.08.08.09.06.03.0171.06.08.010.00.07.07.010.0115.01.09.015
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Minority
Period End2021-06-302021-03-312020-09-302020-06-302019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value10.01.0237.010.0208.010.01410.08.08.09.06.03.0171.06.08.010.00.07.07.010.0115.01.09.015
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value78456176080488133867280228774711562273140381-147.0260240851711491273934710229136759550344-11.064959733354552598284-15.0-395.0252579582-7.0-89.0416467
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.215.925.633.735.310.523.333.711.02.46.623.910.74.513.1-6.311.010.126.125.917.89.828.425.98.24.823.019.111.8-0.420.221.411.51.917.721.810.1-0.5-13.29.320.621.1-0.2-4.921.924.5

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-129.0102136177-554.0-438.02.0-9.0-195.0-27.0-53.0-95.0-167.03462651033147613-583.0-287.0115-199.04815-203.02.0-283.0-316.0-102.0156-200.0-41.0-36.0-62.0245-161.0-129.0222433-57.0-305.0-257.0-270.0-1512.0-453.0-323.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.52.94.67.4-22.2-13.60.1-0.4-7.5-0.9-0.5-4.0-6.511.29.144.162.30.5-17.9-10.54.2-7.11.50.5-7.20.1-8.6-11.0-3.55.3-6.2-1.5-1.2-2.17.9-5.9-4.67.814.5-2.1-10.9-9.3-9.3-84.0-23.9-17.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-413.0-709.0-942.0-942.0-286.082-525.0-736.0-92.0-140.0-444.0-457.0-135.0-663.0-617.0-878.0-1512.0-258.0-271.0-371.0-640.0-4.0-979.0-582.0-33.0-95.0-430.0-254.0-189.0-260.0-297.0-447.0-392.0120-790.0-430.0-200.0-166.0-87.0-177.0-666.0342601692-128.014
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-14.3-20.1-31.8-39.5-11.52.5-18.2-30.9-3.5-4.5-4.1-19.5-5.3-21.5-21.2-37.5-63.9-10.8-8.3-13.5-23.1-0.1-29.8-21.2-1.2-3.3-13.0-8.8-6.5-8.8-9.3-16.0-13.54.1-25.4-15.7-7.1-5.8-2.9-6.5-23.71.28.993.9-6.70.7

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value269-62.0636467-100.018821-19.0-56.0172-3.0-110.0-159.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.3-1.82.12.72.7-3.16.50.9-0.7-1.81.6-0.1-4.3-5.1

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-145.0-155.0178-3.0-82.0-141.08942-58.0-74.0137162-263.0-38.0-31.06962-92.033-27.013-69.029-3.0-125.0-50.08.0517.0-21.0-38.02730-62.0-14.0-63.0541938-66.072595.063-3.01.0
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value78456176080488133867280228774711562273140381-147.0260240851711491273934710229136759550344-11.064959733354552598284-15.0-395.0252579582-7.0-89.0416467
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.215.925.633.735.310.523.333.711.02.46.623.910.74.513.1-6.311.010.126.125.917.89.828.425.98.24.823.019.111.8-0.420.221.411.51.917.721.810.1-0.5-13.29.320.621.1-0.2-4.921.924.5

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value39393353428241179138222828767635315358610-12.0192778305459314280327590303188341467315313336360264252272307210254249280208267255241147158186218134155285
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.626.518.011.816.524.613.29.611.021.53.36.52.319.7-0.48.232.912.814.111.410.111.717.911.16.712.014.210.910.711.411.29.48.79.39.97.79.08.89.47.69.59.28.38.28.39.810.57.58.215.4

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value14207.013196.010.0178.06.010.0167.07.09.0147.07.08.0126.08.010.0138.06.09.0115.08.011112.06.08.0113.010.09.09.0
Percentage of ProfitLoss3.62.12.53.22.42.63.52.52.33.917.22.6-58.33.61.24.61.52.22.93.71.02.65.33.81.71.92.93.31.43.04.44.00.72.93.14.41.14.83.43.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.60.30.50.60.30.40.50.10.30.40.50.20.30.40.60.20.30.30.40.20.30.40.50.20.20.30.40.20.30.40.40.10.20.30.40.10.40.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value37991327539877222227765934514748594-19.0185769291502307272315584295178328459309304325355256241261305204246238277198258246
Percentage of ProfitLoss96.497.997.596.897.697.496.597.597.796.182.897.4158.396.498.895.4109.497.897.196.399.097.494.796.298.398.197.196.798.697.095.696.099.397.196.995.698.995.296.696.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.125.911.515.924.09.310.621.03.26.31.919.2-0.77.932.512.215.411.29.811.317.810.86.311.513.910.710.411.011.19.28.39.09.87.58.78.49.37.39.28.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value851311056764766572918912467707710566707810373708510175749081727310293706869525550555658477455435766
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-129.0102136177-554.0-438.02.0-9.0-195.0-27.0-53.0-95.0-167.03462651033147613-583.0-287.0115-199.04815-203.02.0-283.0-316.0-102.0156-200.0-41.0-36.0-62.0245-161.0-129.0222433-57.0-305.0-257.0-270.0-1512.0-453.0-323.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.52.94.67.4-22.2-13.60.1-0.4-7.5-0.9-0.5-4.0-6.511.29.144.162.30.5-17.9-10.54.2-7.11.50.5-7.20.1-8.6-11.0-3.55.3-6.2-1.5-1.2-2.17.9-5.9-4.67.814.5-2.1-10.9-9.3-9.3-84.0-23.9-17.0

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value41292230305958614957616866455843483469495252658380627764605555526260687258719052435665443833
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-413.0-709.0-942.0-942.0-286.082-525.0-736.0-92.0-140.0-444.0-457.0-135.0-663.0-617.0-878.0-1512.0-258.0-271.0-371.0-640.0-4.0-979.0-582.0-33.0-95.0-430.0-254.0-189.0-260.0-297.0-447.0-392.0120-790.0-430.0-200.0-166.0-87.0-177.0-666.0342601692-128.014
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-14.3-20.1-31.8-39.5-11.52.5-18.2-30.9-3.5-4.5-4.1-19.5-5.3-21.5-21.2-37.5-63.9-10.8-8.3-13.5-23.1-0.1-29.8-21.2-1.2-3.3-13.0-8.8-6.5-8.8-9.3-16.0-13.54.1-25.4-15.7-7.1-5.8-2.9-6.5-23.71.28.993.9-6.70.7

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8632500.00.0209320601134135926888711794140817448083.00.065999273867310111045185710491575870984931212911956361356176411504001.0257751011031040429110017300.075
Percentage of ProceedsFromIssuanceOfLongTermDebt100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value85065025310220613411083163015346941919147113237041.08.01040950637676145717522389641210686845132891682980912631892715650122165140165191425797354.0
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value11510410510310210210310410796979898899092958787898782838485717273755353545550515153495050495152414141
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value34.120.1-1.222.60.1720.193-0.0070.1960.1630.1570.1060.2011.6550.1590.8630.020.7690.001-0.0180.1320.1640.18400.140.1220.1910.0040.1910.1750.189-0.0050.2510.2640.261
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:PerformanceShares


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value15000.0331000.00013000.0487000.0467000.000467000.0564000.003000.0561000.00010000.0538000.00010000.0773000.00015000.0978000.0000816000.00001135000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod100.0100.00.00.0100.0100.0100.00.00.0100.0100.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value489000.0372000.0108000.0118000.0671000.0432000.081000.047000.0661000.0517000.091000.057000.0847000.0505000.0151000.052000.0883000.0614000.0144000.085000.01174000.0849000.0161000.0154000.01187000.0957000.0169000.0177000.01352000.01146000.0116000.093000.01741000.01764000.0225000.0182000.02428000.02278000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod3260.0112.40.00.05161.588.717.30.00.0110.716.10.028233.390.00.00.08830.0114.10.00.011740.0109.80.00.07913.397.90.00.00.0140.40.00.00.0155.40.00.00.00.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value7697105695791208118112261282126216211613466
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1231115694984114291377126711001268147613461274
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value3212992792802782181911641561181007786
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value205200171136130175205127154219257186
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther

aon:AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-1000000.01000000.0-6000000.01000000.003000000.01000000.0001000000.03000000.0
Percentage of AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther100.0100.0100.0100.00.0100.0100.00.00.0100.0100.0

aon:AccountsReceivableAllowanceForCreditLossWriteoffNetOfRecoveries

aon:AccountsReceivableAllowanceForCreditLossWriteoffNetOfRecoveries


Accounts
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value194.00.03.08.0-6.03.08.0-8.0
Percentage of AccountsReceivableAllowanceForCreditLossWriteoffNetOfRecoveries100.0100.00.0100.0100.0100.0100.0100.0100.0

aon:BusinessCombinationTerminationFees us-gaap:SubsequentEventType

aon:BusinessCombinationTerminationFees

us-gaap:SubsequentEvent


Business
Period End2021-07-26
Value1000
Percentage of BusinessCombinationTerminationFees100.0

aon:CapitalizedContractCostAdditions us-gaap:CapitalizedContractCost

aon:CapitalizedContractCostAdditions

aon:CapitalizedCostToFulfillCustomerContracts


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value336346477291274318445326336346461332341370
Percentage of CapitalizedContractCostAdditions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:CapitalizedCostToObtainCustomerContracts


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1513181516121814179.01616138.0
Percentage of CapitalizedContractCostAdditions4.53.83.85.25.83.84.04.35.12.63.54.83.82.2

aon:CapitalizedContractCostForeignCurrencyAndOtherAdjustmentsNet us-gaap:CapitalizedContractCost

aon:CapitalizedContractCostForeignCurrencyAndOtherAdjustmentsNet

aon:CapitalizedCostToFulfillCustomerContracts


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2000000.0-1000000.07000000.02000000.03000000.0-8000000.03000000.0-4000000.01000000.00
Percentage of CapitalizedContractCostForeignCurrencyAndOtherAdjustmentsNet100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

aon:CapitalizedCostToObtainCustomerContracts


Capitalized
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-12000000.02000000.01000000.00-4000000.0-1000000.001000000.0
Percentage of CapitalizedContractCostForeignCurrencyAndOtherAdjustmentsNet-600.028.650.00.050.025.00.00.0

aon:CashAndCashEquivalentsAndShortTermInvestmentsPeriodIncreaseDecrease

aon:CashAndCashEquivalentsAndShortTermInvestmentsPeriodIncreaseDecrease


Cash
Period End2021-06-302021-03-31
Value387-199.0
Percentage of CashAndCashEquivalentsAndShortTermInvestmentsPeriodIncreaseDecrease100.0100.0

aon:DefinedBenefitPlanNetPeriodicBenefitCostBeforeRecognizedNetGainLossDueToSettlementsAndCurtailments us-gaap:RetirementPlanSponsorLocation

aon:DefinedBenefitPlanNetPeriodicBenefitCostBeforeRecognizedNetGainLossDueToSettlementsAndCurtailments

aon:OtherInternationalPlan


Defined
Period End2021-06-302020-09-302020-06-30
Value-2.00.0-1.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCostBeforeRecognizedNetGainLossDueToSettlementsAndCurtailments100.00.0100.0

country:GB


Defined
Period End2021-06-302020-09-302020-06-302019-09-302019-06-30
Value-9.0-10.0-9.0-13.0-13.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCostBeforeRecognizedNetGainLossDueToSettlementsAndCurtailments450.00.0900.00.00.0

country:US


Defined
Period End2021-06-302020-09-302020-06-302019-09-302019-06-30
Value2.05.05.07.07.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCostBeforeRecognizedNetGainLossDueToSettlementsAndCurtailments-100.00.0-500.00.00.0

aon:GainLossOnSaleofBusinessAndInvestmentsNet

aon:GainLossOnSaleofBusinessAndInvestmentsNet


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.00.0255.01.03.04.0
Percentage of GainLossOnSaleofBusinessAndInvestmentsNet0.00.00.0100.0100.0100.0100.0100.0

aon:IncomeLossFromContinuingOperationsBeforeIncomeTaxes

aon:IncomeLossFromContinuingOperationsBeforeIncomeTaxes


Income
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value363495981441285343802421194-87.0718406200-186.0265571362335401702352214421581390380414475353342368410274351346384292352356360208244247
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:IncreaseDecreaseInFiduciaryLiabilities

aon:IncreaseDecreaseInFiduciaryLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1812194-301.0-505.012171045544-776.073711501034-1072.0237800249-560.0282-7.01104-1453.0467-114.046-1059.0300-236.01233-1549.0632106163-1181.0502364834-1691.01314706513-1208.01176246
Percentage of IncreaseDecreaseInFiduciaryLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:IncreaseDecreaseInFiduciaryReceivables

aon:IncreaseDecreaseInFiduciaryReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value145416689-589.0832808583-1100.03176091445-1649.0278605815-976.0327-337.0944-1442.0303-399.0196-911.0289-173.01007-1551.0728-165.0688-1338.061242955-1054.0857644426-1092.0861-181.0
Percentage of IncreaseDecreaseInFiduciaryReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:NetPurchasesOfShortTermInvestmentNonFiduciary

aon:NetPurchasesOfShortTermInvestmentNonFiduciary


Net
Period End2021-06-302021-03-312020-06-302020-03-31
Value116-138.048438
Percentage of NetPurchasesOfShortTermInvestmentNonFiduciary100.0100.0100.0100.0

aon:OtherGeneralExpenses

aon:OtherGeneralExpenses


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value318289340288262342393310344346311336535318316317331308728713673693714685875723816756766727852764803780865778788778835748765766772488461468
Percentage of OtherGeneralExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:PaymentForIssuanceOfSharesForEmployeeBenefitPlans

aon:PaymentForIssuanceOfSharesForEmployeeBenefitPlans


Payment
Period End2021-06-302021-03-312020-06-302020-03-31
Value538745112
Percentage of PaymentForIssuanceOfSharesForEmployeeBenefitPlans100.0100.0100.0100.0

aon:PaymentForRegulatoryTerminationFee us-gaap:SubsequentEventType

aon:PaymentForRegulatoryTerminationFee

us-gaap:SubsequentEvent


Payment
Period End2021-07-27
Value400
Percentage of PaymentForRegulatoryTerminationFee100.0

aon:ProceedsPaymentTowardsIssuanceofSharesUnderIncentiveandSharebasedCompensationPlansNetofPaymentsRelatedtoTaxWithholdingforSharebasedCompensation

aon:ProceedsPaymentTowardsIssuanceofSharesUnderIncentiveandSharebasedCompensationPlansNetofPaymentsRelatedtoTaxWithholdingforSharebasedCompensation


Proceeds
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value16000000.0-45000000.0-112000000.011000000.0-46000000.0-98000000.011000000.0-41000000.0-109000000.021000000.0-54000000.0-85000000.017000000.0-22000000.0-65000000.013000000.0-47000000.0-114000000.0
Percentage of ProceedsPaymentTowardsIssuanceofSharesUnderIncentiveandSharebasedCompensationPlansNetofPaymentsRelatedtoTaxWithholdingforSharebasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable us-gaap:AwardType

aon:ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable

us-gaap:PerformanceShares


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value15000.0331000.01000.0-2000.09000.0487000.0447000.0-6000.0-3000.0467000.0809000.0-1000.03000.0561000.0400000.0-3000.09000.0538000.0-2000.07000.0-1000.0773000.0-9000.0-1000.014000.0978000.0397000.0-8000.0-4000.0816000.0567000.0001135000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0

aon:ShortTermDebtAverageOutstandingAmountWeightedAverageInterestRate us-gaap:ShortTermDebtType

aon:ShortTermDebtAverageOutstandingAmountWeightedAverageInterestRate

us-gaap:CommercialPaper


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0.170.1902.450.01630.0096-0.00160.00150.0070.00490.83170.00790.0092-0.005000.00260.0012-0.00050.0002
Percentage of ShortTermDebtAverageOutstandingAmountWeightedAverageInterestRate100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0

aon:TreasuryStockAcquiredAdditionalTransactionCosts us-gaap:ShareRepurchaseProgram

aon:TreasuryStockAcquiredAdditionalTransactionCosts

aon:ShareRepurchaseProgramOf2012


Treasury
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.00.00.02.03.00.06.01.01.01.02.03.02.04.05.0
Percentage of TreasuryStockAcquiredAdditionalTransactionCosts0.00.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:TreasuryStockValueAcquiredCostMethodIncludingAssociatedAcquisitionCosts us-gaap:ShareRepurchaseProgram

aon:TreasuryStockValueAcquiredCostMethodIncludingAssociatedAcquisitionCosts

aon:ShareRepurchaseProgramOf2012


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value242508005000.046345335010561011983014025535027531035
Percentage of TreasuryStockValueAcquiredCostMethodIncludingAssociatedAcquisitionCosts100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferred1

aon:A2019And2020Acquisitions


Business
Period End2020-12-31
Value0.0
Percentage of BusinessCombinationConsiderationTransferred10.0

us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred

aon:A2019And2020Acquisitions


Business
Period End2020-12-31
Value0.0
Percentage of BusinessCombinationConsiderationTransferredLiabilitiesIncurred0.0

us-gaap:CapitalizedContractCostAmortization us-gaap:CapitalizedContractCost

us-gaap:CapitalizedContractCostAmortization

aon:CapitalizedCostToFulfillCustomerContracts


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-357.0-443.02355-266.0-313.0-416.02542-299.0357439375305353432
Percentage of CapitalizedContractCostAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:CapitalizedCostToObtainCustomerContracts


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-13.0-12.082-12.0-11.0-12.077-11.01111119.01110.0
Percentage of CapitalizedContractCostAmortization3.62.73.54.53.52.93.03.73.12.52.93.03.12.3

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths us-gaap:DerivativeInstrumentRisk

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

us-gaap:ForeignExchangeContract


Cash
Period End2021-06-302021-03-31
Value9.03.0
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths100.0100.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:ContractWithCustomerLiabilityRevenueRecognized


Contract
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1731716917111714714495134139133115
Percentage of ContractWithCustomerLiabilityRevenueRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxesAndTaxCredits

us-gaap:DeferredIncomeTaxesAndTaxCredits


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value96191311-9.0-6.08.0-19.00.0-25.0-97.0-35.0-119.02619019-225.0-2.0-17.0-22.0-8.023-140.0-99.09.07.0-212.0598.010.0-114.0761113-116.0-2.07.016143-14.06.0116329-4.0-12.0
Percentage of DeferredIncomeTaxesAndTaxCredits100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

aon:OtherInternationalPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-3000000.0-4000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0-3000000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

country:GB


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-8000000.0-8000000.0-8000000.0-8000000.0-7000000.0-7000000.0-8000000.0-7000000.0-6000000.0-7000000.0-8000000.0-8000000.0-8000000.0-7000000.0-7000000.0-9000000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses266.7200.0266.7266.7233.3233.3266.7233.3200.0233.3266.7266.7266.7233.3233.3300.0

country:US


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-20000000.0-19000000.0-17000000.0-17000000.0-17000000.0-13000000.0-14000000.0-13000000.0-15000000.0-15000000.0-15000000.0-13000000.0-12000000.0-13000000.0-12000000.0-12000000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses666.7475.0566.7566.7566.7433.3466.7433.3500.0500.0500.0433.3400.0433.3400.0400.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

country:GB


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302016-09-302016-06-30
Value1000000.01000000.001000000.00001000000.01000000.0000001000000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.00.0100.00.00.00.0100.0100.00.00.00.00.00.0100.0

us-gaap:DefinedBenefitPlanContributionsByEmployer

us-gaap:DefinedBenefitPlanContributionsByEmployer


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value1250491835293247138
Percentage of DefinedBenefitPlanContributionsByEmployer100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanContributionsByEmployer us-gaap:RetirementPlanSponsorLocation

aon:OtherInternationalPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value2.08.03.09.02.03.03.07.03.03.08.03.09.02.04.03.0
Percentage of DefinedBenefitPlanContributionsByEmployer16.716.06.150.05.710.39.414.92.20.00.00.00.00.00.00.0

country:GB


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value2.04.02.02.02.01923232725232226161917
Percentage of DefinedBenefitPlanContributionsByEmployer16.78.04.111.15.765.571.948.919.60.00.00.00.00.00.00.0

country:US


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value8.038447.0317.06.0171088.0175.013135.06.0
Percentage of DefinedBenefitPlanContributionsByEmployer66.776.089.838.988.624.118.836.278.30.00.00.00.00.00.00.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

aon:OtherInternationalPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value8.08.08.09.08.09.010.010.01111121311111212
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

country:GB


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value35344039394648494650515049485865
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets437.5425.0500.0433.3487.5511.1480.0490.0418.2454.5425.0384.6445.5436.4483.3541.7

country:US


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value32323433333434343636363435353939
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets400.0400.0425.0366.7412.5377.8340.0340.0327.3327.3300.0261.5318.2318.2325.0325.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanInterestCost

aon:OtherInternationalPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value3.03.05.05.04.06.07.07.06.07.07.07.06.06.07.07.0
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

country:GB


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value17162221222627282629293130303743
Percentage of DefinedBenefitPlanInterestCost566.7533.3440.0420.0550.0433.3385.7400.0433.3414.3414.3442.9500.0500.0528.6614.3

country:US


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value14142221212727272425252424242828
Percentage of DefinedBenefitPlanInterestCost466.7466.7440.0420.0525.0450.0385.7385.7400.0357.1357.1342.9400.0400.0400.0400.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

aon:OtherInternationalPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-2.0-1.00.0-1.0-1.00.00.00.0-2.0-1.0-2.0-3.0-2.0-2.0-2.0-2.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.00.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

country:GB


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-9.0-9.0-10.0-7.0-10.0-13.0-13.0-13.0-4.02.0-7.0-11.0-11.0-11.0-14.049
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost450.0900.00.0700.01000.00.00.00.0200.0-200.0350.0366.7550.0550.0700.0-2450.0

country:US


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value2.01.05.05.05.07.07.07.03.05.04.03.02.02.02.02.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-100.0-100.00.0-500.0-500.00.00.00.0-150.0-500.0-200.0-100.0-100.0-100.0-100.0-100.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

country:GB


Defined
Period End2020-09-302020-06-302019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value0-2000000.0000-9000000.0-16000000.0-7000000.00000-61000000.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.0100.00.00.00.0100.0100.0100.00.00.00.00.0100.0

us-gaap:Depreciation

us-gaap:Depreciation


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value41414342414148444040504047393940545461394156605657565961626063595959645657555653585358313131
Percentage of Depreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:ForeignExchangeContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-15.0-7.028113.0-35.02.0-16.0-9.0-5.042-4.0-20.09.0-2.08.0-1.0-1.01.2-2.0-2.01.02.015
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value115104103102102104107969798988990929587878987828384857172737553535455505151534950504951
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value115104103102102104107969798988990929587878987828384857172737553535455505151534950504951
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents


Effect
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2526-82.0-36.0-19.037-42.0-13.0-81.018-22.0579.025-49.0-8.07.011-17.0-112.0-4.0-39.0-54.0-16.027-24.0-44.0-6.0-47.05.0-6.0-3.08.010.026-23.010.0-23.028-16.03.047
Percentage of EffectOfExchangeRateOnCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Effect
Period End2021-06-302021-03-312020-06-302020-03-31
Value27-16.026-82.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax


Foreign
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-13.04.0-33.0-19.0-2.042-8.01711-11.09.03.029-16.0-5.0-20.0-2.0-10.0122.01.0-17.0-3.016-7.0247.07.0-15.019-2.0-4.0-5.0245.0-24.018-18.0-8.024-4.0-2.0
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfInvestments

us-gaap:GainLossOnSaleOfInvestments


Gain
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.0-13.013-4.0-44.0-20.0-13.01.00.0-27.00.016-6.0-4.03.0-8.0-2.0-12.03.0-2.02.04.0-1.0-1.0-8.037-2.01.0-4.09.0-8.010.08.01.0-1.010.0-3.00.00.01.0
Percentage of GainLossOnSaleOfInvestments0.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss

us-gaap:GoodwillForeignCurrencyTranslationGainLoss


Goodwill
Period End2021-06-302021-03-312020-12-312016-12-31
Value73-79.0205-231.0
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0100.0100.0

us-gaap:GoodwillWrittenOffRelatedToSaleOfBusinessUnit

us-gaap:GoodwillWrittenOffRelatedToSaleOfBusinessUnit


Goodwill
Period End2020-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312011-12-312011-09-30
Value0.01.00.03.030640.00.0130.09.00.00.0
Percentage of GoodwillWrittenOffRelatedToSaleOfBusinessUnit0.0100.00.0100.0100.0100.00.00.0100.00.0100.00.00.0

us-gaap:ImpairmentOfIntangibleAssetsFinitelived us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ImpairmentOfIntangibleAssetsFinitelived

us-gaap:TradeNames


Impairment
Period End2020-12-31
Value0.0
Percentage of ImpairmentOfIntangibleAssetsFinitelived0.0

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTax

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTax


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312013-09-302013-06-302012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312009-09-302009-06-302009-03-31
Value0.01.01.0-1.00.0-1.00.00.069-2.01.06.0-29.0-4.082140754235250.00.00.00.0-1.00.00.02.02.0-1.00.0-26.0563.02.050
Percentage of IncomeLossFromDiscontinuedOperationsNetOfTax0.0100.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.01.01.01.01.01.01.01.01.01.01.01.01.01.01.02.03.06.06.04.01.02.03.04.04.02.02.04.01.05.08.06.04.02.05.00.03.05.0-2.05.0-2.06.013-1.04.02.0
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value61-356.0377132-48.0-275.0357194-125.0-454.0356164-56.0-439.033314013-390.0341112-41.0-348.0502122-71.0-466.032784-24.0-468.0378101-14.0-417.0310153-49.0-451.02277624-327.01746-69.0-274.0
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-59.0142-51.0-152.045141-23.0-7.0-108.01181717.0-174.030-129.0-760.031-56.0786.0-4.0-31.018583-179.027253-66.0-147.02.081-87.0-45.0-65.0118197.041-52.0506458-60.0-19.065
Percentage of IncreaseDecreaseInAccruedIncomeTaxesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInClientFundsHeld

us-gaap:IncreaseDecreaseInClientFundsHeld


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value35828-390.084385237-39.0324420541-411.0577-41.0195-566.0415-44.0330160-11.0164285-150.0-148.011-63.02262.0-96.0271-525.0157-110.0322-121.0-637.0457621339116-315.0-427.0447167-237.0-396.0
Percentage of IncreaseDecreaseInClientFundsHeld100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations

us-gaap:IncreaseDecreaseInPensionAndPostretirementObligations


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-21.0-59.0-24.0-55.0-21.0-41.0-29.0-35.0-38.0-54.0-36.0-139.0-31.0-53.076-41.0-60.0-41.0112-42.022-50.0-39.0-69.0-56.0-66.0-41.0-73.0-98.0-128.0-101.0-110.0-95.0-196.0-171.0-214.0-90.0-110.0-65.0-188.0-65.0-81.0-35.0-54.014-55.0
Percentage of IncreaseDecreaseInPensionAndPostretirementObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-8.048585-455.0-281.0543204-310.019458116-360.0102269398-169.063-38.0375-114.0-65.0-110.0315-173.0-10.0-49.0245-105.0-102.0-13.0233-183.0-17.0-174.0134-159.0-20.0-61.045818126-108.0294243-45.0
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInRestructuringReserve

us-gaap:IncreaseDecreaseInRestructuringReserve


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-15.0-30.0-22.0-60.065-44.07.0-25.09.02.036-24.02.0-8.079990.00.00.00.0-6.0-6.0-6.0-13.0-8.0-13.0-22.0-40.022-2.011-16.0-3.0-5.0-22.0-16.0-5.0-14.0-26.0-28.0
Percentage of IncreaseDecreaseInRestructuringReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1000000.01000000.0100000.0900000.0900000.01300000.002200000.02200000.01500000.0300000.01600000.01400000.01700000.0200000.01700000.002200000.0300000.02100000.01800000.02000000.0300000.02900000.02200000.02900000.0600000.03800000.03100000.03700000.0500000.03400000.03400000.03600000.0300000.03700000.03600000.04200000.0300000.04300000.05000000.06000000.0400000.03500000.04200000.07500000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InformationTechnologyAndDataProcessing

us-gaap:InformationTechnologyAndDataProcessing


Information
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1151141191071071111311201261171211251231151241099888105999983
Percentage of InformationTechnologyAndDataProcessing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterestAndDividend

us-gaap:InvestmentIncomeInterestAndDividend


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.03.01.03.00.02.04.01.01.02.00.00.01.04.07.010.08.02.03.01.03.02.04.03.04.03.03.03.02.02.03.03.02.01.04.01.02.03.04.04.04.06.06.04.04.01.0
Percentage of InvestmentIncomeInterestAndDividend100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LaborAndRelatedExpense

us-gaap:LaborAndRelatedExpense


Labor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1628171916351387136115221601136815011584160113921494161617521419145714611966161116881649185716441653168318481707170817511842166617121725178916201639166117241634161215971715105011691163
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LossContingencyDamagesSoughtValue us-gaap:LitigationCase, us-gaap:LitigationStatus

us-gaap:LossContingencyDamagesSoughtValue

aon:ChristchurchCityCouncil, us-gaap:PendingLitigation


Loss
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-03-312017-10-032017-09-30
Value373370528346339315528333353365352385528381
Percentage of LossContingencyDamagesSoughtValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:FatalPlainCrashInNovember2016, us-gaap:PendingLitigation


Loss
Period End2020-08-312018-11-30
Value84415
Percentage of LossContingencyDamagesSoughtValue0.00.0

us-gaap:MinorityInterestDecreaseFromRedemptions

us-gaap:MinorityInterestDecreaseFromRedemptions


Minority
Period End2021-03-312020-09-302018-06-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value149.01.0-2.01.00.05.07.0-1.04.01.00.0-5.00.0
Percentage of MinorityInterestDecreaseFromRedemptions100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.00.0

us-gaap:MinorityInterestDecreaseFromRedemptions us-gaap:StatementEquityComponents

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Minority
Period End2021-03-312020-09-302020-06-302013-12-312013-09-302013-06-302013-03-312011-12-31
Value8.07.0-4.0-2.0-2.08.0-1.00.0
Percentage of MinorityInterestDecreaseFromRedemptions57.177.80.00.0-40.0114.3100.00.0

us-gaap:NoncontrollingInterest


Minority
Period End2021-03-312020-09-302020-06-302018-06-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302012-06-302012-03-312011-12-31
Value6.02.04.01.0-2.01.02.07.03.01.00.0-5.00.0
Percentage of MinorityInterestDecreaseFromRedemptions42.922.20.0100.0100.0100.00.0140.075.0100.00.0100.00.0

us-gaap:OccupancyNet

us-gaap:OccupancyNet


Occupancy
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value76777470747391768587879496938989868486868982
Percentage of OccupancyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value120-58.017383-403.0-215.0-121.0146-302.0-139.0-369.0277-213.024461150-305.010.0-239.0183-320.0-623.0-329.08619237159
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value6.02.0-3.0-2.01.0-3.0320.0-15.0-219.072-2.00.03.0-336.00.02.00.02040.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax5.0-3.4-1.7-2.4-0.21.40.00.00.071.8720.00.80.0-0.953.9-0.02.30.086.10.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-1.010.05.0-2.0-9.0-4.0-3.0-2.0-7.0-7.04.0-12.06.0-1.00.00.0-2.01.02.0-1.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax-0.8-17.22.9-2.42.21.90.00.00.02.340.05.03.30.3-0.0-0.0-2.35.30.8-0.6

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value115-70.017187-395.0-208.0-266.0-89.0-59.0-79.0-66.0-225.0176-321.0-278.0-318.0741814154
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax95.8120.798.8104.898.096.70.00.00.025.9-660.094.196.2100.344.696.786.094.75.996.9

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax us-gaap:DerivativeInstrumentRisk

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax

us-gaap:ForeignExchangeContract


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-2.0135.0-2.0-11.0-6.0-12.04.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax us-gaap:DerivativeInstrumentRisk

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax

us-gaap:ForeignExchangeContract


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0-1000000.0-2000000.0-6000000.0-5000000.0-4000000.0-3000000.0-5000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax0.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:ForeignExchangeContract, aon:CompensationandBenefits


Other
Period End2020-09-302020-06-302019-06-30
Value1000000.0-1000000.00
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax-50.016.7-0.0

us-gaap:ForeignExchangeContract, us-gaap:InterestExpense


Other
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value00-1000000.000-1000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax-0.0-0.020.0-0.0-0.020.0

us-gaap:ForeignExchangeContract, us-gaap:Sales


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0-1000000.0-3000000.0-5000000.0-4000000.0-4000000.0-3000000.0-4000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax0.0100.0150.083.380.0100.0100.080.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value2000000.02000000.01000000.0-2000000.02000000.0-4000000.002000000.02000000.0-3000000.0-6000000.03000000.02000000.07000000.0-5000000.01000000.0-2000000.00000-4000000.0-1000000.0-1000000.0-1000000.000-2000000.0-2000000.03000000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.00.00.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value147-30.0238197113-376.0-3.0-193.0-97.0169-277.0-108.0-333.0306-84.026573162-119.0-71.0-12.0-287.030-217.0191-293.0-616.0-300.010254262171-32.0-165.0-360.0182-193.0131-470.0-202.016203
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value3329-168.0202324-203.017
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent22.4-96.7-70.610.220.4-6.46766.7-8.8

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-1.0119.06.03.0-5.06.0-2.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-0.7-36.73.83.02.71.3-200.01.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value115-70.039717187-395.0194-208.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent78.2233.3166.886.877.0105.1-6466.7107.8

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-33.0-29.0168-20.0-23.0-24.0203-17.0-14.0-31.09162-122.0-48.037-18.0-20.0-18.0-148.0-18.0-51.0201-93.0-18.0-21.0-23.0330-26.0-18.0-26.0-228.0-24.0-18.0-23.0404-7.0-18.0-21.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-33.0-29.0-20.0-23.0-24.0-17.0-14.0-31.09162-122.0-48.037-18.0-20.0-18.0-148.0-18.0-51.0201-93.0-18.0-21.0-23.0330-26.0-18.0-26.0-228.0-24.0-18.0-23.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value-1.0119.06.03.0-5.06.0-2.0-8.07.0-3.01.0-1.014-1.0114.0-2.0-1.00.0-4.0-7.0-10.0-6.0-1.00.0-2.01.0-14.0130.00.00.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.00.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value-1.0116.03.0-5.0-2.0-8.07.0-3.01.0-1.014-1.0114.0-2.0-1.00.0-4.0-7.0-10.00.0-1.00.0-2.01.0-14.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0-0.0100.00.0100.0100.0100.0

us-gaap:PaymentsForRepurchaseOfEquity

us-gaap:PaymentsForRepurchaseOfEquity


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value242508005000.04634533521055100198301402569511788
Percentage of PaymentsForRepurchaseOfEquity100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForRestructuring

us-gaap:PaymentsForRestructuring


Payments
Period End2020-12-312013-12-312013-09-30
Value153935
Percentage of PaymentsForRestructuring100.0100.0100.0

us-gaap:PaymentsToAcquireBusinessesGross us-gaap:BusinessAcquisition

us-gaap:PaymentsToAcquireBusinessesGross

aon:A2019And2020Acquisitions


Payments
Period End2020-12-31
Value0.0
Percentage of PaymentsToAcquireBusinessesGross0.0

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired

us-gaap:PaymentsToAcquireBusinessesNetOfCashAcquired


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.00.0343340.0240.0158.00.0212985723103466811516716-10.03.02.02115381785.0283.0212.063155923-5.015843.01958358.047
Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired0.00.0100.0100.00.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireOtherInvestments

us-gaap:PaymentsToAcquireOtherInvestments


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value11181720174319344614152925119.023239.0171815142632.00.01.01.05.04.010.02.07.03.03.03.02.04.03.02.08.0146.0172.05.010.0
Percentage of PaymentsToAcquireOtherInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionExpense

us-gaap:PensionExpense


Pension
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-8.0-6.0-3.0-4.0-2.0-4.03.0-3.0-5.0-4.0-6.00.07.0-2.0112-9.0-9.0-8.0
Percentage of PensionExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromDivestitureOfBusinessesNetOfCashDivested

us-gaap:ProceedsFromDivestitureOfBusinessesNetOfCashDivested


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-31
Value0.00.00.0309.0361.06.0-2.0-9.02.0-1.0521.04195-2.03.01.06.0971512.011410.0470.01.0345.00.01.00.01.01.00.00.01.0-40.0
Percentage of ProceedsFromDivestitureOfBusinessesNetOfCashDivested0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.00.0100.00.0100.0100.00.00.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities


Proceeds
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-16.0-68.0-45.0-26.040-20.0-38.0-23.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value30113017116.028192.012417.06.01725144.025128.010.013197137.03.01.03.06.04212585.0187.01201536877.079178.05.01166
Percentage of ProceedsFromSaleAndMaturityOfOtherInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ProvisionForDoubtfulAccounts


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value216.010.04.06.09.08.07.04.08.03.09.03.08.02.05.05.06.0-6.05.06.06.01.01.03.08.03.01.04.04.03.0-5.01.010.0
Percentage of ProvisionForDoubtfulAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax


Reclassification
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-35.0-37.0-33.0-39.0-35.0-31.0-29.0-31.0-34.0-39.0-46.0-38.0-160.0-30.0-21.0-16.0-25.0-27.0-31.0-30.0-40.0-15.0-38.0-23.0-50.0-32.0-18.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-35.0-36.0-31.0-33.0-30.0-27.0-186.0-26.0-84.0-26.0-29.0-29.0-30.0-29.0-12.0-34.0-24.0-36.0-31.0-34.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax100.097.393.984.685.787.10.00.00.0104.0107.493.5100.072.580.089.5104.372.096.9188.9

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.0-1.0-2.0-6.0-5.0-4.0-3.0-3.0-5.01.02.0-2.0-11.00.00.00.00.00.00.020
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax-0.02.76.115.414.312.90.00.00.0-4.0-7.46.536.7-0.0-0.0-0.0-0.0-0.0-0.0-111.1

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax


Reclassification
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-27.0-28.0-24.0-30.0-27.0-22.0-24.0-23.0-25.0-31.0-36.0-29.0-129.0-21.0-12.0-12.0-18.0-20.0-22.0-8.0-27.0-7.0-29.0-16.0-35.0-25.0-14.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-27.0-27.0-23.0-25.0-23.0-20.0-116.0-18.0-66.0-18.0-21.0-20.0-21.0-20.0-6.0-26.0-16.0-26.0-24.0-24.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.096.495.883.385.290.90.00.00.0100.0105.090.9262.574.185.789.7100.074.396.0171.4

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.0-1.0-1.0-5.0-4.0-2.0-2.0-2.0-3.00.01.0-2.06.00.00.00.00.00.00.013
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax-0.03.64.216.714.89.10.00.00.0-0.0-5.09.1-75.0-0.0-0.0-0.0-0.0-0.0-0.0-92.9

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:ReclassificationFromAociCurrentPeriodTax


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value-8000000.0-9000000.0-8000000.0-9000000.0-9000000.0-8000000.0-1000000.0
Percentage of ReclassificationFromAociCurrentPeriodTax100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value-8000000.0-9000000.0-8000000.0-8000000.0-8000000.0-7000000.0-2000000.0
Percentage of ReclassificationFromAociCurrentPeriodTax100.0100.0100.088.988.987.5200.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value0-1000000.0-1000000.0-1000000.01000000.0
Percentage of ReclassificationFromAociCurrentPeriodTax-0.011.111.112.5-100.0

us-gaap:RestructuringReserveTranslationAdjustment

us-gaap:RestructuringReserveTranslationAdjustment


Restructuring
Period End2020-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value4.01.09.01.03.07.04.0-3.02.02.0-2.04.04.0
Percentage of RestructuringReserveTranslationAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value46000.070000.090000.022000.037000.079000.055000.067000.056000.041000.040000.049000.046000.063000.049000.068000.0472000.050000.046000.0120000.0119000.094000.060000.098000.081000.049000.0105000.0164000.096000.0125000.0134000.079000.0101000.0128000.0123000.0160000.0177000.0179000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value5.0166.05.01.05.0146.03.04.03.0121.03.02.04.0105.01.001.091.01.02.01.078.01.03.03.064.02.02.04.050.002.01.044.000044.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.00.00.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:PerformanceShares


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1.0220.0001.0160.0165.00-1.0165.0134.00-1.0135.000-1.0115.00-1.00101.000096.000081.000058.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue100.0100.00.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.00.00.0100.0100.00.0100.00.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value12.0226.0006.0179.01.01.03.0170.01.00-4.0144.01.01.02.0119.0002.099.0-1.001.097.0001.083.0002.060.001.0-2.047.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue1200.0102.70.00.0600.0111.90.60.0-300.0103.00.70.0400.0106.70.00.0-200.0103.50.0-0.00.098.00.00.00.0101.00.00.00.0102.50.00.00.0103.40.00.00.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value642000.0452000.0110000.059000.0674000.0583000.0110000.0100000.0774000.0677000.0171000.0108000.0858000.0806000.0113000.0122000.01212000.0960000.0116000.0148000.01202000.01379000.0168000.0180000.01323000.01714000.0171000.0241000.01370000.01950000.0327000.0273000.01265000.02080000.0615000.0357000.0964000.02022000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-9.0160.000-8.0141.01.0-1.0-4.0117.00-1.0-3.0101.000-8.090.000-3.073.000-1.059.000-2.051.000-2.046.000-1.043.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue100.0100.00.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.0

us-gaap:ShorttermDebtAverageOutstandingAmount us-gaap:ShortTermDebtType

us-gaap:ShorttermDebtAverageOutstandingAmount

us-gaap:CommercialPaper


Shortterm
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value6517-110.097808456-30.065663932314820744125-57.00.031836714271
Percentage of ShorttermDebtAverageOutstandingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value500000.0900000.0100000.0400000.01200000.0200000.0600000.01400000.0100000.0300000.0600000.01500000.0300000.0400000.01000000.01900000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-52.0-87.012-45.0-112.09.0-47.0-96.0-8.010.0-41.0-109.0-4.021-53.0-85.0-214.023-1.018-220.0170.015-2.015-1.014-2.0130.0169.030-12.02.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-52.0-87.012-45.0-112.010.0-47.0-96.0-9.011-41.0-109.0-3.021-53.0-85.0-214.0220.018-221.0180.015-2.015-1.014-1.0130.0169.030-12.02.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0111.1100.0100.0112.5110.0100.0100.075.0100.0100.0100.0100.095.7-0.0100.0100.5105.90.0100.0100.0100.0100.0100.050.0100.00.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockAcquiredAverageCostPerShare us-gaap:ShareRepurchaseProgram

us-gaap:TreasuryStockAcquiredAverageCostPerShare

aon:ShareRepurchaseProgramOf2012


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-10-252019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-312017-12-312017-09-302017-07-312017-06-302017-03-312016-09-302016-06-302016-04-302016-03-312015-09-302015-06-302015-03-31
Value235.84217.7-0.73201.960212.783.07193.91190.83183.23161.161.79145.71141.23140.94134.412.09139.61133.24128.54114.46110.260103.5897.9295.75100.92100.15
Percentage of TreasuryStockAcquiredAverageCostPerShare100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockSharesAcquired us-gaap:ShareRepurchaseProgram

us-gaap:TreasuryStockSharesAcquired

aon:ShareRepurchaseProgramOf2012


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-10-252019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-312017-12-312017-09-302017-07-312017-06-302017-03-312016-12-312016-09-302016-06-302016-04-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.10.23.92.40.02.22.30.0251.85.80.61.22.12.83.90.1935.40.58.01.1792.70.00.67.7666.33.02.5
Percentage of TreasuryStockSharesAcquired100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockSharesAcquired us-gaap:StatementEquityComponents

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Treasury
Period End2021-06-302021-03-312020-09-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value1.10.22.42.21.85.80.61.22.12.83.93.55.38.11.11.72.70.07.74.36.32.92.55.45.87.47.21.07.33.55.0-8.8-5.4
Percentage of TreasuryStockSharesAcquired100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.03.798.1101.2100.02.1100.00.0100.06.5100.096.7100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:TreasuryStockValueAcquiredCostMethod


Treasury
Period End2021-06-302021-03-312020-09-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value24250500463350105610120030140255350280010001262063000.0750400600300250500500650600775002253005002752501000.0155323350
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:ShareRepurchaseProgram

aon:ShareRepurchaseProgramOf2012


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-10-252019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312018-01-312017-12-312017-09-302017-07-312017-06-302017-03-312016-12-312016-09-302016-06-302016-04-302016-03-312015-12-312015-08-312015-09-302015-06-302015-03-31
Value242508005000.04614504.8350105010019730040055015770074960100012561003010.06575047505000600300250
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.00.0100.00.099.60.00.0100.099.499.098.599.799.599.50.01533.993.60.0100.099.22961.2100.30.00.0100.01187.5100.00.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Treasury
Period End2021-06-302021-03-312020-09-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value24250500463350105610119830140255350275310341262063010.075040060030025050050065060077500225300500275
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.0100.0100.099.0100.0100.0100.0100.094.1103.4100.0100.0100.30.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

aon:BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, aon:MoneyMarketFundsAndOtherHighlyLiquidDebtSecurities


Basis
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value33712850278129033238225220071851235619791759206317091847
Percentage of BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, aon:MoneyMarketFundsAndOtherHighlyLiquidDebtSecurities


Basis
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value33712850278129033238225220071851235619791759206317091847
Percentage of BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill us-gaap:BusinessAcquisition

aon:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill

aon:A2019And2020Acquisitions


Business
Period End2020-12-312020-09-30
Value461457
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill100.0100.0

aon:CapitalLossCarryforwards us-gaap:IncomeTaxAuthority

aon:CapitalLossCarryforwards

aon:OtherCountry


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value4229302322182062238665
Percentage of CapitalLossCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DomesticCountry


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value577411400415294360380270251
Percentage of CapitalLossCarryforwards1373.81417.21333.3178.9134.9174.8170.4314.0386.2

us-gaap:InternalRevenueServiceIRS


Capital
Period End2020-12-312019-12-312018-12-312017-12-31
Value1121123670.0
Percentage of CapitalLossCarryforwards266.7386.21223.30.0

us-gaap:StateAndLocalJurisdiction


Capital
Period End2020-12-312019-12-312018-12-312017-12-31
Value1231232210.0
Percentage of CapitalLossCarryforwards292.9424.1736.70.0

aon:CashAndCashEquivalentsAndShortTermInvestments

aon:CashAndCashEquivalentsAndShortTermInvestments


Cash
Period End2021-06-302021-03-312020-12-31
Value13809931192
Percentage of CashAndCashEquivalentsAndShortTermInvestments100.0100.0100.0

aon:CashandCashEquivalentsandShortTermInvestments

aon:CashandCashEquivalentsandShortTermInvestments


Cashand
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value11921269141186092877981673482865166071512852389343063372194668910527407838517217685997261000
Percentage of CashandCashEquivalentsandShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:DeferredTaxAssetsLeaseGuarantees

aon:DeferredTaxAssetsLeaseGuarantees


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2000000.03000000.05000000.06000000.00
Percentage of DeferredTaxAssetsLeaseGuarantees100.0100.0100.0100.00.0

aon:DeferredTaxAssetsLeaseLiability

aon:DeferredTaxAssetsLeaseLiability


Deferred
Period End2020-12-312019-12-31
Value248247
Percentage of DeferredTaxAssetsLeaseLiability100.0100.0

aon:DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards

aon:DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value653440563362399349295354368484
Percentage of DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment

aon:DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value2912513104369829611058107411281333
Percentage of DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:DeferredTaxLiabilitiesLeaseRightofUseAsset

aon:DeferredTaxLiabilitiesLeaseRightofUseAsset


Deferred
Period End2020-12-312019-12-31
Value211219
Percentage of DeferredTaxLiabilitiesLeaseRightofUseAsset100.0100.0

aon:DeferredTaxLiabilitiesOtherAccruedExpenses

aon:DeferredTaxLiabilitiesOtherAccruedExpenses


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value22253612101994039621214132
Percentage of DeferredTaxLiabilitiesOtherAccruedExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationUnderlyingPriceInflation us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

aon:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationUnderlyingPriceInflation

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value2.00.020.020.02
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationUnderlyingPriceInflation100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.120.01780.01880.01870.0183
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationUnderlyingPriceInflation106.089.094.093.50.0

aon:DefinedBenefitPlanMarketRelatedValue us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

aon:DefinedBenefitPlanMarketRelatedValue

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value14971303115512561076
Percentage of DefinedBenefitPlanMarketRelatedValue100.0100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value66525959522559065675
Percentage of DefinedBenefitPlanMarketRelatedValue444.4457.3452.4470.2527.4

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value20761969198119261819
Percentage of DefinedBenefitPlanMarketRelatedValue138.7151.1171.5153.3169.1

aon:DefinedBenefitPlanPercentageOfTotalPensionObligations

aon:DefinedBenefitPlanPercentageOfTotalPensionObligations


Defined
Period End2020-12-31
Value91.0
Percentage of DefinedBenefitPlanPercentageOfTotalPensionObligations100.0

aon:DistributableReservesAvailableAmount

aon:DistributableReservesAvailableAmount


Distributable
Period End2020-12-312019-12-312019-07-162018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-04-04
Value200324003100022001200160021004000590070008000
Percentage of DistributableReservesAvailableAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:EmployeeRelatedLiabilitiesNoncurrent

aon:EmployeeRelatedLiabilitiesNoncurrent


Employee
Period End2021-06-302020-12-31
Value7553
Percentage of EmployeeRelatedLiabilitiesNoncurrent100.0100.0

aon:EmployeerelatedLiabilitiesNoncurrent

aon:EmployeerelatedLiabilitiesNoncurrent


Employeerelated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value5353504741494849445660606267615961565659565954545557566059105216
Percentage of EmployeerelatedLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:FiduciaryAssets

aon:FiduciaryAssets


Fiduciary
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value158041389413798135491379412401118341104112071114121016693141047610738962592929582916294858710102019776993299561138910894116381081512786120381187111698125761222412214113431273611795108381031511760106091006310835
Percentage of FiduciaryAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:FiduciaryAssetsPremiumTrustBalances

aon:FiduciaryAssetsPremiumTrustBalances


Fiduciary
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value570052003900370038003400400038004000420035003300
Percentage of FiduciaryAssetsPremiumTrustBalances100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:FiduciaryLiabilities

aon:FiduciaryLiabilities


Fiduciary
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value15804138941379813549137941240111834110411207111412194393141047610738196192929582916218018710102019776993299561138910894116381081512786120381187111698125761222412214113431273611795108381031511760106091006310835
Percentage of FiduciaryLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearOne

aon:FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearOne


Finance
Period End2020-12-31
Value257
Percentage of FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearOne100.0

aon:FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncome

aon:FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncome


Financing
Period End2020-12-31
Value1196
Percentage of FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncome100.0

aon:FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncomeUndiscountedExcessAmount

aon:FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncomeUndiscountedExcessAmount


Financing
Period End2020-12-31
Value118
Percentage of FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncomeUndiscountedExcessAmount100.0

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDue

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDue


Financing
Period End2020-12-31
Value1314
Percentage of FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDue100.0

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueAfterYearFive

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueAfterYearFive


Financing
Period End2020-12-31
Value382
Percentage of FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueAfterYearFive100.0

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive


Financing
Period End2020-12-31
Value120
Percentage of FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive100.0

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour


Financing
Period End2020-12-31
Value148
Percentage of FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour100.0

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree


Financing
Period End2020-12-31
Value178
Percentage of FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree100.0

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo

aon:FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo


Financing
Period End2020-12-31
Value229
Percentage of FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo100.0

aon:FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment

aon:FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment


Finite
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value22062167214620432890
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment100.0100.0100.0100.0100.0

aon:FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment us-gaap:FiniteLivedIntangibleAssetsByMajorClass

aon:CustomerRelatedAndContractBased


Finite
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value18351793177516901600
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment83.282.782.782.755.4

aon:MarketingTechnologyAndOther


Finite
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value358361358341334
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment16.216.716.716.711.6

us-gaap:TradeNames


Finite
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value13131312956
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment0.60.60.60.633.1

aon:InterestCarryforward us-gaap:IncomeTaxAuthority

aon:InterestCarryforward

aon:OtherCountry


Interest
Period End2020-12-312019-12-312018-12-312017-12-31
Value34159186196
Percentage of InterestCarryforward100.0100.0100.0100.0

us-gaap:DomesticCountry


Interest
Period End2020-12-312019-12-312018-12-312017-12-31
Value121203530.0
Percentage of InterestCarryforward355.9127.728.50.0

us-gaap:InternalRevenueServiceIRS


Interest
Period End2020-12-312019-12-312018-12-312017-12-31
Value12203554240.0
Percentage of InterestCarryforward3588.2223.3228.00.0

us-gaap:StateAndLocalJurisdiction


Interest
Period End2020-12-312019-12-312018-12-312017-12-31
Value5731722270.0
Percentage of InterestCarryforward1685.3108.2122.00.0

aon:LossContingencyInvestmentLossesSufferedByPlaintiff us-gaap:LitigationCase, us-gaap:LitigationStatus

aon:LossContingencyInvestmentLossesSufferedByPlaintiff

aon:NEBC, us-gaap:PendingLitigation


Loss
Period End2020-09-16
Value2000
Percentage of LossContingencyInvestmentLossesSufferedByPlaintiff100.0

aon:OperatingAndFinanceLeaseLiability

aon:OperatingAndFinanceLeaseLiability


Operating
Period End2020-12-312019-12-31
Value11961230
Percentage of OperatingAndFinanceLeaseLiability100.0100.0

aon:OperatingLeaseAndFinanceLeaseLiabilitiesNoncurrent

aon:OperatingLeaseAndFinanceLeaseLiabilitiesNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value55646572787476823750169
Percentage of OperatingLeaseAndFinanceLeaseLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:OperatingLeaseAndFinanceLeaseLiabilityCurrent

aon:OperatingLeaseAndFinanceLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value228222234224216200210
Percentage of OperatingLeaseAndFinanceLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0

aon:OperatingLeaseAndFinanceLeaseRightofUseAsset

aon:OperatingLeaseAndFinanceLeaseRightofUseAsset


Operating
Period End2020-12-312019-12-31
Value10001029
Percentage of OperatingLeaseAndFinanceLeaseRightofUseAsset100.0100.0

aon:OtherTaxAssetsCurrent

aon:OtherTaxAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value854595131837988177145811131961721181142081521471001691461229424422021831125821313020469
Percentage of OtherTaxAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization

aon:PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization


Property
Period End2020-12-312019-12-31
Value15991550
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization100.0100.0

aon:PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization us-gaap:StatementGeographical

aon:AmericasOtherthanUnitedStates


Property
Period End2020-12-312019-12-31
Value127145
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization7.99.4

country:GB


Property
Period End2020-12-312019-12-31
Value213225
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization13.314.5

country:IE


Property
Period End2020-12-312019-12-31
Value1110.0
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization0.70.6

country:US


Property
Period End2020-12-312019-12-31
Value681686
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization42.644.3

srt:AsiaPacific


Property
Period End2020-12-312019-12-31
Value210175
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization13.111.3

us-gaap:EMEA


Property
Period End2020-12-312019-12-31
Value357319
Percentage of PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization22.320.6

aon:RestrictedCashOperatingFunds

aon:RestrictedCashOperatingFunds


Restricted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value44444444424242424242534242605742545443434343646464406340407777777711777777777120
Percentage of RestrictedCashOperatingFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:UnamortizedExpenseOnPerformanceBasedPlans us-gaap:AwardType

aon:UnamortizedExpenseOnPerformanceBasedPlans

us-gaap:PerformanceShares


Unamortized
Period End2021-03-312020-03-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value727829778.061687578515762576471786777859370525965705359656319
Percentage of UnamortizedExpenseOnPerformanceBasedPlans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedIncomeTaxesNoncurrent

us-gaap:AccruedIncomeTaxesNoncurrent


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value586589561554548544525578576596585563535538529333326317288268260251223215208201210202194194184178
Percentage of AccruedIncomeTaxesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-312010-12-31
Value102101988984817067656462666265595959615865646258636570747988899099114122118104102
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent us-gaap:CumulativeEffectPeriodOfAdoption

srt:CumulativeEffectPeriodOfAdoptionAdjustedBalance


Allowance
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value1019884817765646459
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0110.0100.0100.0103.2100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables

aon:A2019And2020Acquisitions


Business
Period End2020-12-312020-09-30
Value1921
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities

aon:A2019And2020Acquisitions


Business
Period End2020-12-312020-09-30
Value4238
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities100.0100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities

aon:A2019And2020Acquisitions


Business
Period End2020-12-31
Value15
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther

aon:A2019And2020Acquisitions


Business
Period End2020-09-30
Value11
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther100.0

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets

aon:A2019And2020Acquisitions


Business
Period End2020-12-312020-09-30
Value125.0
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets100.0100.0

us-gaap:CapitalizedContractCostNet us-gaap:CapitalizedContractCost

us-gaap:CapitalizedContractCostNet

aon:CapitalizedCostToFulfillCustomerContracts


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value222241339220193229335239216236329248216240298
Percentage of CapitalizedContractCostNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aon:CapitalizedCostToObtainCustomerContracts


Capitalized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value175185184176172167171163161155156150144144145
Percentage of CapitalizedContractCostNet78.876.854.380.089.172.951.068.274.565.747.460.566.760.048.7

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations


Cash
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value884790656756431
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerAssetNetCurrent

us-gaap:ContractWithCustomerAssetNetCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value2222413392201932293352392162363292482162400.0
Percentage of ContractWithCustomerAssetNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:ContractWithCustomerAssetNetNoncurrent

us-gaap:ContractWithCustomerAssetNetNoncurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value1751851841761721671711631611551561501441440.0
Percentage of ContractWithCustomerAssetNetNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:ContractWithCustomerLiabilityNoncurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value6866766769726259596065526049
Percentage of ContractWithCustomerLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount

us-gaap:DebtInstrumentCarryingAmount


Debt
Period End2020-12-31
Value7835
Percentage of DebtInstrumentCarryingAmount100.0

us-gaap:DebtInstrumentRepurchasedFaceAmount us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:DebtInstrumentRepurchasedFaceAmount

aon:TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOne, us-gaap:SeniorNotes, us-gaap:SubsequentEvent


Debt
Period End2021-02-16
Value400
Percentage of DebtInstrumentRepurchasedFaceAmount100.0

us-gaap:DebtLongtermAndShorttermCombinedAmount

us-gaap:DebtLongtermAndShorttermCombinedAmount


Debt
Period End2020-12-312019-12-312018-12-31
Value772973396244
Percentage of DebtLongtermAndShorttermCombinedAmount100.0100.0100.0

us-gaap:DebtLongtermAndShorttermCombinedAmount us-gaap:DebtInstrument, us-gaap:LongtermDebtType

aon:A2.20SeniorNotesdueNovember2020, us-gaap:SeniorNotes


Debt
Period End2020-12-312019-12-31
Value498497
Percentage of DebtLongtermAndShorttermCombinedAmount6.46.8

aon:A2.875notesdue2026, us-gaap:SeniorNotes


Debt
Period End2020-12-312019-12-312018-12-31
Value606550562
Percentage of DebtLongtermAndShorttermCombinedAmount7.87.59.0

aon:A280SeniorNotesDueMay2030, us-gaap:SeniorNotes


Debt
Period End2020-12-31
Value992
Percentage of DebtLongtermAndShorttermCombinedAmount12.8

aon:A3.50NotesdueJune2024, us-gaap:SeniorNotes


Debt
Period End2020-12-312019-12-312018-12-31
Value597597596
Percentage of DebtLongtermAndShorttermCombinedAmount7.78.19.5

aon:A3.75SeniorNotesDueMay22029, us-gaap:SeniorNotes


Debt
Period End2020-12-312019-12-312018-12-31
Value7447440.0
Percentage of DebtLongtermAndShorttermCombinedAmount9.610.10.0

aon:A3.875SeniorNotesdueDecember2025, us-gaap:SeniorNotes


Debt
Period End2020-12-312019-12-312018-12-31
Value747746746
Percentage of DebtLongtermAndShorttermCombinedAmount9.710.211.9

aon:A4.00SeniorNotesDueNovember2023, us-gaap:SeniorNotes


Debt
Period End2020-12-312019-12-312018-12-31
Value349348348
Percentage of DebtLongtermAndShorttermCombinedAmount4.54.75.6

aon:A4.50SeniorNotesDueDecember2028, us-gaap:SeniorNotes


Debt
Period End2020-12-312019-12-312018-12-31
Value347346347
Percentage of DebtLongtermAndShorttermCombinedAmount4.54.75.6

aon:FourPointSevenFivePercentSeniorNotesDueTwentyFortyFive, us-gaap:SeniorNotes


Debt
Period End2020-12-312019-12-312018-12-31
Value593593592
Percentage of DebtLongtermAndShorttermCombinedAmount7.78.19.5

aon:NotesDueat2043at4.45Percent, us-gaap:SeniorNotes


Debt
Period End2020-12-312019-12-312018-12-31
Value247246246
Percentage of DebtLongtermAndShorttermCombinedAmount3.23.43.9

aon:SeniorNotes4.25PercentDue2042, us-gaap:SeniorNotes


Debt
Period End2020-12-312019-12-312018-12-31
Value200199198
Percentage of DebtLongtermAndShorttermCombinedAmount2.62.73.2

aon:TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOne, us-gaap:SeniorNotes


Debt
Period End2020-12-312019-12-312018-12-31
Value400399398
Percentage of DebtLongtermAndShorttermCombinedAmount5.25.46.4

us-gaap:DebtLongtermAndShorttermCombinedAmount us-gaap:LongtermDebtType

us-gaap:NotesPayableOtherPayables


Debt
Period End2020-12-312019-12-312018-12-31
Value481.01.0
Percentage of DebtLongtermAndShorttermCombinedAmount0.60.00.0

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxAssetsNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value738721724655654638645611599588561476452296389565575351322300
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsDeferredIncome

us-gaap:DeferredTaxAssetsDeferredIncome


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value36242920576540
Percentage of DeferredTaxAssetsDeferredIncome100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value14361356112097715591552147212271422169516031460
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsInvestments

us-gaap:DeferredTaxAssetsInvestments


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value28282835485645501317
Percentage of DeferredTaxAssetsInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value5457464860564658771006636
Percentage of DeferredTaxAssetsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value312373351424661635739623917940929934
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value103689865102984414247154161132
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value41332438504420642940752.0
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesTaxDeferredIncome

us-gaap:DeferredTaxLiabilitiesTaxDeferredIncome


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value141128143322030282730834934
Percentage of DeferredTaxLiabilitiesTaxDeferredIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings

us-gaap:DeferredTaxLiabilitiesUndistributedForeignEarnings


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value37283039291828510.0
Percentage of DeferredTaxLiabilitiesUndistributedForeignEarnings100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains

us-gaap:DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value26262622262944278.0232312
Percentage of DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value15921391124713731191
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation100.0100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value54064779412948934874
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation339.6343.6331.1356.4409.2

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value33803192287731552902
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation212.3229.5230.7229.8243.7

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1171039199110
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation7.37.47.37.29.2

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value514454433452394
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax100.0100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value13291244113612361256
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax258.6274.0262.4273.5318.8

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value18121763170817061618
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax352.5388.3394.5377.4410.7

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-521000000.0-460000000.0-440000000.0-459000000.0-400000000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-1286000000.0-1204000000.0-1106000000.0-1217000000.0-1237000000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax246.8261.7251.4265.1309.2

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-1812000000.0-1762000000.0-1705000000.0-1701000000.0-1612000000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax347.8383.0387.5370.6403.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-13000000.0-3000000.06000000.03000000.0-10000000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax2.50.7-1.4-0.72.5

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-7.0-6.0-7.0-7.0-6.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax100.0100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value4340301919
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax-614.3-666.7-428.6-271.4-316.7

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-1.0-1.0-1.0-1.0-3.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax14.316.714.314.350.0

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value386332317307243
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet100.0100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value25752424223222492057
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet667.1730.1704.1732.6846.5

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value708637627509399
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet183.4191.9197.8165.8164.2

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-88.0-85.0-84.0-86.0-85.0
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet-22.8-25.6-26.5-28.0-35.0

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value1349132112801249119211641216121312131224113312081272120710601020941858
Percentage of DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1268120011131034836
Percentage of DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent99.198.798.297.597.4

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:Range, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

srt:Maximum, aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value2.470.0310.03880.0339
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0100.0100.0100.0

srt:Maximum, country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value2.450.03170.04260.0361
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate99.2102.3109.8106.5

srt:Minimum, aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value0.380.0090.01890.0178
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate15.429.048.752.5

srt:Minimum, country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.740.02720.03920.0327
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate70.487.7101.096.5

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:Range, us-gaap:RetirementPlanType

srt:Maximum, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.580.03250.04260.03640.0415
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate104.5104.8109.8107.40.0

srt:Minimum, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value2.10.02930.03910.03320.0371
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate85.094.5100.897.90.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1.450.02090.02950.02630.0277
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate58.767.476.077.60.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease us-gaap:Range, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

srt:Maximum, aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value3.03.00.030.03
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0100.0100.0100.0

srt:Maximum, country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value3.723.740.04230.042
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease124.0124.7141.0140.0

srt:Minimum, aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.01.00.010.01
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease33.333.333.333.3

srt:Minimum, country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value3.223.240.03730.037
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease107.3108.0124.3123.3

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanBenefitObligation

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value162514251271140112271177
Percentage of DefinedBenefitPlanBenefitObligation100.0100.0100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value540647794129489348744985
Percentage of DefinedBenefitPlanBenefitObligation332.7335.4324.9349.3397.2423.5

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value338031922877315529023154
Percentage of DefinedBenefitPlanBenefitObligation208.0224.0226.4225.2236.5268.0

us-gaap:DefinedBenefitPlanEstimatedAmountOfPlanParticipantsFutureBenefitsCoveredByInsuranceContractsIssuedByEmployerOrRelatedParties us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanEstimatedAmountOfPlanParticipantsFutureBenefitsCoveredByInsuranceContractsIssuedByEmployerOrRelatedParties

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-11-30
Value94
Percentage of DefinedBenefitPlanEstimatedAmountOfPlanParticipantsFutureBenefitsCoveredByInsuranceContractsIssuedByEmployerOrRelatedParties100.0

us-gaap:DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value200000.0800000.01700000.01400000.0
Percentage of DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-31
Value-400000.0
Percentage of DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value274252248257
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value1007913795858
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter367.5362.3320.6333.9

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value893887879901
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter325.9352.0354.4350.6

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value262525194
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter9.59.910.175.5

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value48434243
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value161164137134
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths335.4381.4326.2311.6

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value192186178170
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths400.0432.6423.8395.3

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.05.05.04.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths10.411.611.99.3

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value52474648
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value185172152159
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive355.8366.0330.4331.2

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value183181177182
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive351.9385.1384.8379.2

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value51464547
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value180167149151
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour352.9363.0331.1321.3

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value192189187187
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour376.5410.9415.6397.9

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value50464446
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value174160144145
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree348.0347.8327.3315.2

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value190192185182
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree380.0417.4420.5395.7

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value49444345
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value167154139141
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo340.8350.0323.3313.3

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value193190182176
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo393.9431.8423.3391.1

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value19191922
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value8.05.04663
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear42.126.3242.1286.4

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value95998092
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear500.0521.1421.1418.2

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.04.05.04.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear26.321.126.318.2

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear us-gaap:RetirementPlanSponsorLocation

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear

country:GB


Defined
Period End2021-06-302021-03-312020-09-302020-06-30
Value8.08.05.05.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear100.0100.0100.0100.0

country:US


Defined
Period End2021-06-302021-03-312020-09-302020-06-30
Value73739999
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear912.5912.51980.01980.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-128.0-122.0-116.0-145.0-151.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value1246118010961013801
Percentage of DefinedBenefitPlanFundedStatusOfPlan-973.4-967.2-944.8-698.6-530.5

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-1104.0-1126.0-1081.0-1197.0-1219.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan862.5923.0931.9825.5807.3

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-100.0-87.0-77.0-82.0-92.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan78.171.366.456.660.9

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value1400130011001200
Percentage of DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value1600140012001400
Percentage of DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value54544752
Percentage of DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation3.43.93.93.7

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value3300310029003200
Percentage of DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation206.2221.4241.7228.6

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value44340636313001100
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation100.0100.0100.0100.0100.0

country:GB, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value545447521200
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation12.213.312.94.0109.1

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value33003100290032002900
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation744.9763.5798.9246.2263.6

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets

aon:TheNetherlandsAndCanada, us-gaap:PensionPlansDefinedBenefit