10-Q Filing

AON PLC CIK: 315293 Q3 2020

Filing Information

Form Type	10-Q
Accession Number	`0001628280-20-015165`
Period End Date	20200930
Filing Date	20201030
Fiscal Year	2020
Fiscal Period	Q3
XBRL Instance	aon-20200930_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 78 Income Statement 112 Cash Flow Statement 90 Stockholders Equity 88 Comprehensive Income 56

Balance Sheet 78 line items

Line Item	Tag	Value	Unit	Period
Common stock, nominal or par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Common stock, nominal or par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Common stock, authorized shares (in shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Common stock, authorized shares (in shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$790.00M	USD	Point-in-time
Common stock, issued shares (in shares)	`CommonStockSharesIssued`	232.10M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$821.00M	USD	Point-in-time
Common stock, issued shares (in shares)	`CommonStockSharesIssued`	229.20M	shares	Point-in-time
Short-term investments	`ShortTermInvestments`	$138.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$448.00M	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$2.91B	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.11B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$13.55B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$11.83B	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$525.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$602.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$18.25B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$16.48B	USD	Point-in-time
Goodwill	`Goodwill`	$8.46B	USD	Point-in-time
Goodwill	`Goodwill`	$8.16B	USD	Point-in-time
Net Carrying Amount	`FiniteLivedIntangibleAssetsNet`	$665.00M	USD	Point-in-time
Net Carrying Amount	`FiniteLivedIntangibleAssetsNet`	$783.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$609.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$621.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$914.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$929.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$645.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$655.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$1.25B	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$1.22B	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$556.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$570.00M	USD	Point-in-time
Total assets	`Assets`	$31.36B	USD	Point-in-time
Total assets	`Assets`	$29.41B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$1.94B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$1.61B	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$712.00M	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$472.00M	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$13.55B	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$11.83B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.09B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.24B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$15.57B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$16.87B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$7.25B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$6.63B	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$910.00M	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$944.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$223.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$199.00M	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.74B	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.60B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$888.00M	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$877.00M	USD	Point-in-time
Total liabilities	`Liabilities`	$25.96B	USD	Point-in-time
Total liabilities	`Liabilities`	$27.74B	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500 shares (issued: 2020 - 229.2; 2019 - 232.1)	`CommonStockValue`	$2.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500 shares (issued: 2020 - 229.2; 2019 - 232.1)	`CommonStockValue`	$2.00M	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$6.22B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$6.15B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.25B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.42B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-4.10B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-4.03B	USD	Point-in-time
Total Aon shareholders' equity	`StockholdersEquity`	$3.38B	USD	Point-in-time
Total Aon shareholders' equity	`StockholdersEquity`	$3.54B	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$78.00M	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$74.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.56B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.86B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.45B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.69B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.26B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.62B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.91B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.22B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$29.41B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$31.36B	USD	Point-in-time

Income Statement 112 line items

Line Item	Tag	Value	Unit	Period
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$8.10B	USD	3 Qtrs
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$2.38B	USD	1 Quarter
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$2.38B	USD	1 Quarter
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$8.13B	USD	3 Qtrs
Compensation and benefits	`LaborAndRelatedExpense`	$4.45B	USD	3 Qtrs
Compensation and benefits	`LaborAndRelatedExpense`	$4.27B	USD	3 Qtrs
Compensation and benefits	`LaborAndRelatedExpense`	$1.37B	USD	1 Quarter
Compensation and benefits	`LaborAndRelatedExpense`	$1.39B	USD	1 Quarter
Information technology	`InformationTechnologyAndDataProcessing`	$120.00M	USD	1 Quarter
Information technology	`InformationTechnologyAndDataProcessing`	$325.00M	USD	3 Qtrs
Information technology	`InformationTechnologyAndDataProcessing`	$107.00M	USD	1 Quarter
Information technology	`InformationTechnologyAndDataProcessing`	$363.00M	USD	3 Qtrs
Premises	`OccupancyNet`	$70.00M	USD	1 Quarter
Premises	`OccupancyNet`	$76.00M	USD	1 Quarter
Premises	`OccupancyNet`	$217.00M	USD	3 Qtrs
Premises	`OccupancyNet`	$248.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$124.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$44.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$124.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$42.00M	USD	1 Quarter
Amortization of intangible assets	`AmortizationOfIntangibleAssets`	$205.00M	USD	3 Qtrs
Amortization of intangible assets	`AmortizationOfIntangibleAssets`	$101.00M	USD	1 Quarter
Amortization of intangible assets	`AmortizationOfIntangibleAssets`	$295.00M	USD	3 Qtrs
Amortization of intangible assets	`AmortizationOfIntangibleAssets`	$50.00M	USD	1 Quarter
Other general expense	`OtherGeneralExpenses`	$892.00M	USD	3 Qtrs
Other general expense	`OtherGeneralExpenses`	$1.00B	USD	3 Qtrs
Other general expense	`OtherGeneralExpenses`	$310.00M	USD	1 Quarter
Other general expense	`OtherGeneralExpenses`	$288.00M	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$6.03B	USD	3 Qtrs
Total operating expenses	`CostsAndExpenses`	$2.02B	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$6.48B	USD	3 Qtrs
Total operating expenses	`CostsAndExpenses`	$1.94B	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$1.65B	USD	3 Qtrs
Operating income	`OperatingIncomeLoss`	$2.07B	USD	3 Qtrs
Operating income	`OperatingIncomeLoss`	$441.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$360.00M	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	$4.00M	USD	3 Qtrs
Interest income	`InvestmentIncomeInterestAndDividend`	$5.00M	USD	3 Qtrs
Interest income	`InvestmentIncomeInterestAndDividend`	$3.00M	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	$1.00M	USD	1 Quarter
Interest expense	`InterestExpense`	$252.00M	USD	3 Qtrs
Interest expense	`InterestExpense`	$78.00M	USD	1 Quarter
Interest expense	`InterestExpense`	$80.00M	USD	1 Quarter
Interest expense	`InterestExpense`	$227.00M	USD	3 Qtrs
Other income (expense)	`OtherNonoperatingIncomeExpense`	$18.00M	USD	3 Qtrs
Other income (expense)	`OtherNonoperatingIncomeExpense`	$2.00M	USD	1 Quarter
Other income (expense)	`OtherNonoperatingIncomeExpense`	$8.00M	USD	3 Qtrs
Other income (expense)	`OtherNonoperatingIncomeExpense`	$-1.00M	USD	1 Quarter
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxes`	$1.43B	USD	3 Qtrs
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxes`	$285.00M	USD	1 Quarter
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxes`	$1.84B	USD	3 Qtrs
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxes`	$363.00M	USD	1 Quarter
Income tax expense	`IncomeTaxExpenseBenefit`	$356.00M	USD	3 Qtrs
Income tax expense	`IncomeTaxExpenseBenefit`	$82.00M	USD	1 Quarter
Income tax expense	`IncomeTaxExpenseBenefit`	$238.00M	USD	3 Qtrs
Income tax expense	`IncomeTaxExpenseBenefit`	$56.00M	USD	1 Quarter
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$281.00M	USD	1 Quarter
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$1.48B	USD	3 Qtrs
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$229.00M	USD	1 Quarter
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$1.19B	USD	3 Qtrs
Net income (loss) from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-1.00M	USD	1 Quarter
Net income (loss) from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$1.00M	USD	3 Qtrs
Net income (loss) from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$1.00M	USD	1 Quarter
Net income (loss) from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-1.00M	USD	3 Qtrs
Net income	`ProfitLoss`	$1.19B	USD	3 Qtrs
Net income	`ProfitLoss`	$282.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.48B	USD	3 Qtrs
Net income	`ProfitLoss`	$228.00M	USD	1 Quarter
Net income	`ProfitLoss`	$411.00M	USD	1 Quarter
Net income	`ProfitLoss`	$791.00M	USD	1 Quarter
Net income	`ProfitLoss`	$287.00M	USD	1 Quarter
Net income	`ProfitLoss`	$676.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$33.00M	USD	3 Qtrs
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$7.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$39.00M	USD	3 Qtrs
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$6.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.16B	USD	3 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.45B	USD	3 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$275.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$222.00M	USD	1 Quarter
Continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$6.21	USD	3 Qtrs
Continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$4.83	USD	3 Qtrs
Continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.94	USD	1 Quarter
Continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$1.18	USD	1 Quarter
Discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	-	USD	1 Quarter
Discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	-	USD	1 Quarter
Discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	-	USD	3 Qtrs
Discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	-	USD	3 Qtrs
Net income (in dollars per share)	`EarningsPerShareBasic`	$1.18	USD	1 Quarter
Net income (in dollars per share)	`EarningsPerShareBasic`	$4.83	USD	3 Qtrs
Net income (in dollars per share)	`EarningsPerShareBasic`	$6.21	USD	3 Qtrs
Net income (in dollars per share)	`EarningsPerShareBasic`	$0.94	USD	1 Quarter
Continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$6.18	USD	3 Qtrs
Continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.93	USD	1 Quarter
Continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$4.79	USD	3 Qtrs
Continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$1.18	USD	1 Quarter
Discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	-	USD	3 Qtrs
Discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	-	USD	3 Qtrs
Discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	-	USD	1 Quarter
Discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	-	USD	1 Quarter
Net income (in dollars per share)	`EarningsPerShareDiluted`	$1.18	USD	1 Quarter
Net income (in dollars per share)	`EarningsPerShareDiluted`	$4.79	USD	3 Qtrs
Net income (in dollars per share)	`EarningsPerShareDiluted`	$6.18	USD	3 Qtrs
Net income (in dollars per share)	`EarningsPerShareDiluted`	$0.93	USD	1 Quarter
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	239.90M	shares	3 Qtrs
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	232.80M	shares	3 Qtrs
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	236.90M	shares	1 Quarter
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	232.60M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	239.10M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	233.90M	shares	3 Qtrs
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	241.90M	shares	3 Qtrs
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	233.50M	shares	1 Quarter

Cash Flow Statement 90 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$1.19B	USD	3 Qtrs
Net income	`ProfitLoss`	$282.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.48B	USD	3 Qtrs
Net income	`ProfitLoss`	$228.00M	USD	1 Quarter
Net income	`ProfitLoss`	$411.00M	USD	1 Quarter
Net income	`ProfitLoss`	$791.00M	USD	1 Quarter
Net income	`ProfitLoss`	$287.00M	USD	1 Quarter
Net income	`ProfitLoss`	$676.00M	USD	1 Quarter
Less: Net income (loss) from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-1.00M	USD	1 Quarter
Less: Net income (loss) from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$1.00M	USD	3 Qtrs
Less: Net income (loss) from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$1.00M	USD	1 Quarter
Less: Net income (loss) from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-1.00M	USD	3 Qtrs
(Gain) loss from sales of businesses, net	`GainLossOnSaleofBusinessAndInvestmentsNet`	$8.00M	USD	3 Qtrs
(Gain) loss from sales of businesses, net	`GainLossOnSaleofBusinessAndInvestmentsNet`	$25.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$124.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$44.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$124.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$42.00M	USD	1 Quarter
Amortization and impairment of intangible assets	`AmortizationOfIntangibleAssets`	$205.00M	USD	3 Qtrs
Amortization and impairment of intangible assets	`AmortizationOfIntangibleAssets`	$101.00M	USD	1 Quarter
Amortization and impairment of intangible assets	`AmortizationOfIntangibleAssets`	$295.00M	USD	3 Qtrs
Amortization and impairment of intangible assets	`AmortizationOfIntangibleAssets`	$50.00M	USD	1 Quarter
Share-based compensation expense	`ShareBasedCompensation`	$207.00M	USD	3 Qtrs
Share-based compensation expense	`ShareBasedCompensation`	$252.00M	USD	3 Qtrs
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-4.00M	USD	3 Qtrs
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-44.00M	USD	3 Qtrs
Fiduciary receivables	`IncreaseDecreaseInFiduciaryReceivables`	$-174.00M	USD	3 Qtrs
Fiduciary receivables	`IncreaseDecreaseInFiduciaryReceivables`	$1.05B	USD	3 Qtrs
Short-term investments funds held on behalf of clients	`IncreaseDecreaseInClientFundsHeld`	$1.28B	USD	3 Qtrs
Short-term investments funds held on behalf of clients	`IncreaseDecreaseInClientFundsHeld`	$706.00M	USD	3 Qtrs
Fiduciary liabilities	`IncreaseDecreaseInFiduciaryLiabilities`	$1.11B	USD	3 Qtrs
Fiduciary liabilities	`IncreaseDecreaseInFiduciaryLiabilities`	$1.76B	USD	3 Qtrs
Receivables, net	`IncreaseDecreaseInReceivables`	$167.00M	USD	3 Qtrs
Receivables, net	`IncreaseDecreaseInReceivables`	$-193.00M	USD	3 Qtrs
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-385.00M	USD	3 Qtrs
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-191.00M	USD	3 Qtrs
Restructuring reserves	`IncreaseDecreaseInRestructuringReserve`	$-62.00M	USD	3 Qtrs
Restructuring reserves	`IncreaseDecreaseInRestructuringReserve`	$-112.00M	USD	3 Qtrs
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$3.00M	USD	3 Qtrs
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$34.00M	USD	3 Qtrs
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-127.00M	USD	3 Qtrs
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-117.00M	USD	3 Qtrs
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-90.00M	USD	3 Qtrs
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-226.00M	USD	3 Qtrs
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$2.02B	USD	3 Qtrs
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.16B	USD	3 Qtrs
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$34.00M	USD	3 Qtrs
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$33.00M	USD	3 Qtrs
Payments for investments	`PaymentsToAcquireOtherInvestments`	$80.00M	USD	3 Qtrs
Payments for investments	`PaymentsToAcquireOtherInvestments`	$94.00M	USD	3 Qtrs
Net purchases of short-term investments non-fiduciary	`PaymentsToAcquireMarketableSecurities`	$7.00M	USD	3 Qtrs
Net purchases of short-term investments non-fiduciary	`PaymentsToAcquireMarketableSecurities`	$312.00M	USD	3 Qtrs
Acquisition of businesses, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$39.00M	USD	3 Qtrs
Acquisition of businesses, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$368.00M	USD	3 Qtrs
Sale of businesses, net of cash sold	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$43.00M	USD	3 Qtrs
Sale of businesses, net of cash sold	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$30.00M	USD	3 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$119.00M	USD	3 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$167.00M	USD	3 Qtrs
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-231.00M	USD	3 Qtrs
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-815.00M	USD	3 Qtrs
Share repurchase	`PaymentsForRepurchaseOfEquity`	$963.00M	USD	3 Qtrs
Share repurchase	`PaymentsForRepurchaseOfEquity`	$1.51B	USD	3 Qtrs
Issuance of shares for employee benefit plans	`ProceedsPaymentTowardsIssuanceofSharesUnderIncentiveandSharebasedCompensationPlansNetofPaymentsRelatedtoTaxWithholdingforSharebasedCompensation`	$-133.00M	USD	3 Qtrs
Issuance of shares for employee benefit plans	`ProceedsPaymentTowardsIssuanceofSharesUnderIncentiveandSharebasedCompensationPlansNetofPaymentsRelatedtoTaxWithholdingforSharebasedCompensation`	$-141.00M	USD	3 Qtrs
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$4.92B	USD	3 Qtrs
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$4.15B	USD	3 Qtrs
Repayment of debt	`RepaymentsOfLongTermDebt`	$3.86B	USD	3 Qtrs
Repayment of debt	`RepaymentsOfLongTermDebt`	$3.86B	USD	3 Qtrs
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$307.00M	USD	3 Qtrs
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$307.00M	USD	3 Qtrs
Noncontrolling interests and other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-31.00M	USD	3 Qtrs
Noncontrolling interests and other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-81.00M	USD	3 Qtrs
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-968.00M	USD	3 Qtrs
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-1.15B	USD	3 Qtrs
Effect of exchange rates on cash and cash equivalents	`EffectOfExchangeRateOnCashAndCashEquivalents`	$-31.00M	USD	3 Qtrs
Effect of exchange rates on cash and cash equivalents	`EffectOfExchangeRateOnCashAndCashEquivalents`	$-18.00M	USD	3 Qtrs
Net increase (decrease) in cash and cash equivalents	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-54.00M	USD	3 Qtrs
Net increase (decrease) in cash and cash equivalents	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$31.00M	USD	3 Qtrs
Cash and cash equivalents at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$602.00M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$790.00M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$821.00M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$656.00M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$602.00M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$790.00M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$821.00M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$656.00M	USD	Point-in-time
Interest paid	`InterestPaidNet`	$196.00M	USD	3 Qtrs
Interest paid	`InterestPaidNet`	$214.00M	USD	3 Qtrs
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$326.00M	USD	3 Qtrs
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$279.00M	USD	3 Qtrs

Stockholders Equity 88 line items

Line Item	Tag	Value	Unit	Period
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.44	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.44	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.44	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.44	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.40	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.44	USD	1 Quarter
Beginning Balance (in shares)	`CommonStockSharesIssued`	232.10M	shares	Point-in-time
Beginning Balance (in shares)	`CommonStockSharesIssued`	229.20M	shares	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.56B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.86B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.45B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.69B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.26B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.62B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.91B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.22B	USD	Point-in-time
Net income	`ProfitLoss`	$1.19B	USD	3 Qtrs
Net income	`ProfitLoss`	$282.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.48B	USD	3 Qtrs
Net income	`ProfitLoss`	$228.00M	USD	1 Quarter
Net income	`ProfitLoss`	$411.00M	USD	1 Quarter
Net income	`ProfitLoss`	$791.00M	USD	1 Quarter
Net income	`ProfitLoss`	$287.00M	USD	1 Quarter
Net income	`ProfitLoss`	$676.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-96.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-112.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-47.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$12.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$9.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-45.00M	USD	1 Quarter
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$1.06B	USD	1 Quarter
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$500.00M	USD	1 Quarter
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$463.00M	USD	1 Quarter
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$101.00M	USD	1 Quarter
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$350.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$91.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$89.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$72.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$81.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$67.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$64.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$96.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$104.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$103.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$102.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$102.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$107.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$3.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-5.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-2.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$4.00M	USD	3 Qtrs
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-3.00M	USD	3 Qtrs
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-8.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$7.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$6.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-212.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$133.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-182.00M	USD	3 Qtrs
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-103.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-397.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$173.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$88.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-136.00M	USD	3 Qtrs
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-24.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-67.00M	USD	3 Qtrs
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-17.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-31.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-20.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-62.00M	USD	3 Qtrs
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-14.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-23.00M	USD	1 Quarter
Purchases of subsidiary shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	-	USD	1 Quarter
Purchases of subsidiary shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$9.00M	USD	1 Quarter
Purchases of subsidiary shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	-	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$7.00M	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$20.00M	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$23.00M	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$10.00M	USD	1 Quarter
Ending Balance (in shares)	`CommonStockSharesIssued`	232.10M	shares	Point-in-time
Ending Balance (in shares)	`CommonStockSharesIssued`	229.20M	shares	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.56B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.86B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.45B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.69B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.26B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.62B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.91B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.22B	USD	Point-in-time

Comprehensive Income 56 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$1.19B	USD	3 Qtrs
Net income	`ProfitLoss`	$282.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.48B	USD	3 Qtrs
Net income	`ProfitLoss`	$228.00M	USD	1 Quarter
Net income	`ProfitLoss`	$411.00M	USD	1 Quarter
Net income	`ProfitLoss`	$791.00M	USD	1 Quarter
Net income	`ProfitLoss`	$287.00M	USD	1 Quarter
Net income	`ProfitLoss`	$676.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$33.00M	USD	3 Qtrs
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$7.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$39.00M	USD	3 Qtrs
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$6.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.16B	USD	3 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.45B	USD	3 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$275.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$222.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$3.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-5.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-2.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$4.00M	USD	3 Qtrs
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-3.00M	USD	3 Qtrs
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-8.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$7.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$6.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-212.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$133.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-182.00M	USD	3 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-103.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-397.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$173.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$88.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-136.00M	USD	3 Qtrs
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-24.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-67.00M	USD	3 Qtrs
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-17.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-31.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-20.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-62.00M	USD	3 Qtrs
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-14.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-23.00M	USD	1 Quarter
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-65.00M	USD	3 Qtrs
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-197.00M	USD	1 Quarter
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-123.00M	USD	3 Qtrs
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$199.00M	USD	1 Quarter
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$1.00M	USD	3 Qtrs
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-4.00M	USD	1 Quarter
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$2.00M	USD	1 Quarter
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-2.00M	USD	3 Qtrs
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-66.00M	USD	3 Qtrs
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$197.00M	USD	1 Quarter
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-121.00M	USD	3 Qtrs
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-193.00M	USD	1 Quarter
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$1.38B	USD	3 Qtrs
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$1.04B	USD	3 Qtrs
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$472.00M	USD	1 Quarter
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$29.00M	USD	1 Quarter

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