10-Q Filing

AON PLC CIK: 315293 Q3 2023

Filing Information

Form Type	10-Q
Accession Number	`0001628280-23-035412`
Period End Date	20230930
Filing Date	20231027
Fiscal Year	2023
Fiscal Period	Q3
XBRL Instance	aon-20230930_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 79 Income Statement 92 Cash Flow Statement 97 Stockholders Equity 90 Comprehensive Income 56

Balance Sheet 79 line items

Line Item	Tag	Value	Unit	Period
Ordinary shares, nominal value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Ordinary shares, nominal value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Ordinary shares, authorized shares (in shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Ordinary shares, authorized shares (in shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Ordinary shares, issued shares (in shares)	`CommonStockSharesIssued`	205.40M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$690.00M	USD	Point-in-time
Ordinary shares, issued shares (in shares)	`CommonStockSharesIssued`	200.80M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$808.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$692.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$175.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$452.00M	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.04B	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.30B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$15.96B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$15.90B	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$877.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$646.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$21.12B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$20.72B	USD	Point-in-time
Goodwill	`Goodwill`	$8.29B	USD	Point-in-time
Goodwill	`Goodwill`	$8.24B	USD	Point-in-time
Intangible assets, net	`FiniteLivedIntangibleAssetsNet`	$252.00M	USD	Point-in-time
Intangible assets, net	`FiniteLivedIntangibleAssetsNet`	$447.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$652.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$558.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$699.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$646.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$824.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$1.02B	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$673.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$652.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$509.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$497.00M	USD	Point-in-time
Total assets	`Assets`	$33.11B	USD	Point-in-time
Total assets	`Assets`	$32.70B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.11B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$1.75B	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$945.00M	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$1.28B	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$15.90B	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$15.96B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.35B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.73B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$20.31B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$20.72B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$9.82B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$9.97B	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$640.00M	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$693.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$99.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$117.00M	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.15B	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.19B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$1.00B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$1.02B	USD	Point-in-time
Total liabilities	`Liabilities`	$33.13B	USD	Point-in-time
Total liabilities	`Liabilities`	$33.60B	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2023 - 200.8; 2022 - 205.4)	`CommonStockValue`	$2.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2023 - 200.8; 2022 - 205.4)	`CommonStockValue`	$2.00M	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$7.01B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$6.86B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-2.77B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-3.02B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-4.58B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-4.62B	USD	Point-in-time
Total Aon shareholders' deficit	`StockholdersEquity`	$-586.00M	USD	Point-in-time
Total Aon shareholders' deficit	`StockholdersEquity`	$-529.00M	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$100.00M	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$100.00M	USD	Point-in-time
Total deficit	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$58.00M	USD	Point-in-time
Total deficit	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$788.00M	USD	Point-in-time
Total deficit	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-486.00M	USD	Point-in-time
Total deficit	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-670.00M	USD	Point-in-time
Total deficit	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-429.00M	USD	Point-in-time
Total deficit	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.29B	USD	Point-in-time
Total deficit	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.16B	USD	Point-in-time
Total deficit	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$162.00M	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$33.11B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$32.70B	USD	Point-in-time

Income Statement 92 line items

Line Item	Tag	Value	Unit	Period
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$9.35B	USD	3 Qtrs
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$10.00B	USD	3 Qtrs
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$2.70B	USD	1 Quarter
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$2.95B	USD	1 Quarter
Compensation and benefits	`LaborAndRelatedExpense`	$1.69B	USD	1 Quarter
Compensation and benefits	`LaborAndRelatedExpense`	$5.23B	USD	3 Qtrs
Compensation and benefits	`LaborAndRelatedExpense`	$1.53B	USD	1 Quarter
Compensation and benefits	`LaborAndRelatedExpense`	$4.94B	USD	3 Qtrs
Information technology	`InformationTechnologyAndDataProcessing`	$371.00M	USD	3 Qtrs
Information technology	`InformationTechnologyAndDataProcessing`	$133.00M	USD	1 Quarter
Information technology	`InformationTechnologyAndDataProcessing`	$135.00M	USD	1 Quarter
Information technology	`InformationTechnologyAndDataProcessing`	$403.00M	USD	3 Qtrs
Premises	`OccupancyNet`	$74.00M	USD	1 Quarter
Premises	`OccupancyNet`	$217.00M	USD	3 Qtrs
Premises	`OccupancyNet`	$71.00M	USD	1 Quarter
Premises	`OccupancyNet`	$216.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$119.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$37.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$42.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$115.00M	USD	3 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$20.00M	USD	1 Quarter
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$87.00M	USD	3 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$70.00M	USD	3 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$34.00M	USD	1 Quarter
Other general expense	`OtherGeneralExpenses`	$949.00M	USD	3 Qtrs
Other general expense	`OtherGeneralExpenses`	$300.00M	USD	1 Quarter
Other general expense	`OtherGeneralExpenses`	$965.00M	USD	3 Qtrs
Other general expense	`OtherGeneralExpenses`	$299.00M	USD	1 Quarter
Accelerating Aon United Program expenses	`RestructuringCharges`	$6.00M	USD	1 Quarter
Accelerating Aon United Program expenses	`RestructuringCharges`	-	USD	1 Quarter
Accelerating Aon United Program expenses	`RestructuringCharges`	$6.00M	USD	3 Qtrs
Accelerating Aon United Program expenses	`RestructuringCharges`	-	USD	3 Qtrs
Total operating expenses	`CostsAndExpenses`	$2.26B	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$6.69B	USD	3 Qtrs
Total operating expenses	`CostsAndExpenses`	$7.00B	USD	3 Qtrs
Total operating expenses	`CostsAndExpenses`	$2.11B	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$3.01B	USD	3 Qtrs
Operating income	`OperatingIncomeLoss`	$590.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$2.66B	USD	3 Qtrs
Operating income	`OperatingIncomeLoss`	$691.00M	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	$9.00M	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	$7.00M	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	$19.00M	USD	3 Qtrs
Interest income	`InvestmentIncomeInterestAndDividend`	$15.00M	USD	3 Qtrs
Interest expense	`InterestExpense`	$360.00M	USD	3 Qtrs
Interest expense	`InterestExpense`	$296.00M	USD	3 Qtrs
Interest expense	`InterestExpense`	$119.00M	USD	1 Quarter
Interest expense	`InterestExpense`	$103.00M	USD	1 Quarter
Other income (expense)	`OtherNonoperatingIncomeExpense`	$-21.00M	USD	1 Quarter
Other income (expense)	`OtherNonoperatingIncomeExpense`	$16.00M	USD	1 Quarter
Other income (expense)	`OtherNonoperatingIncomeExpense`	$-105.00M	USD	3 Qtrs
Other income (expense)	`OtherNonoperatingIncomeExpense`	$71.00M	USD	3 Qtrs
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$510.00M	USD	1 Quarter
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$2.56B	USD	3 Qtrs
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$560.00M	USD	1 Quarter
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$2.45B	USD	3 Qtrs
Income tax expense	`IncomeTaxExpenseBenefit`	$439.00M	USD	3 Qtrs
Income tax expense	`IncomeTaxExpenseBenefit`	$92.00M	USD	1 Quarter
Income tax expense	`IncomeTaxExpenseBenefit`	$467.00M	USD	3 Qtrs
Income tax expense	`IncomeTaxExpenseBenefit`	$93.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.05B	USD	1 Quarter
Net income	`ProfitLoss`	$575.00M	USD	1 Quarter
Net income	`ProfitLoss`	$514.00M	USD	1 Quarter
Net income	`ProfitLoss`	$2.12B	USD	3 Qtrs
Net income	`ProfitLoss`	$418.00M	USD	1 Quarter
Net income	`ProfitLoss`	$467.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.98B	USD	3 Qtrs
Net income	`ProfitLoss`	$1.08B	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$10.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$11.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$48.00M	USD	3 Qtrs
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$55.00M	USD	3 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLoss`	$456.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$408.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.93B	USD	3 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.07B	USD	3 Qtrs
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$1.93	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$10.10	USD	3 Qtrs
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$2.25	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$9.06	USD	3 Qtrs
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$9.00	USD	3 Qtrs
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$1.92	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$2.23	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$10.03	USD	3 Qtrs
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	204.60M	shares	3 Qtrs
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	210.90M	shares	1 Quarter
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	213.20M	shares	3 Qtrs
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	202.90M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	204.60M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	212.60M	shares	1 Quarter
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	206.00M	shares	3 Qtrs
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	214.60M	shares	3 Qtrs

Cash Flow Statement 97 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$1.05B	USD	1 Quarter
Net income	`ProfitLoss`	$575.00M	USD	1 Quarter
Net income	`ProfitLoss`	$514.00M	USD	1 Quarter
Net income	`ProfitLoss`	$2.12B	USD	3 Qtrs
Net income	`ProfitLoss`	$418.00M	USD	1 Quarter
Net income	`ProfitLoss`	$467.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.98B	USD	3 Qtrs
Net income	`ProfitLoss`	$1.08B	USD	1 Quarter
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$53.00M	USD	3 Qtrs
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	-	USD	1 Quarter
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$6.00M	USD	1 Quarter
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	-	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$119.00M	USD	3 Qtrs
Depreciation of fixed assets	`Depreciation`	$37.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$42.00M	USD	1 Quarter
Depreciation of fixed assets	`Depreciation`	$115.00M	USD	3 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$20.00M	USD	1 Quarter
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$87.00M	USD	3 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$70.00M	USD	3 Qtrs
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$34.00M	USD	1 Quarter
Share-based compensation expense	`ShareBasedCompensation`	$321.00M	USD	3 Qtrs
Share-based compensation expense	`ShareBasedCompensation`	$304.00M	USD	3 Qtrs
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-232.00M	USD	3 Qtrs
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-87.00M	USD	3 Qtrs
Other, net	`OtherNoncashIncomeExpense`	$-1.00M	USD	3 Qtrs
Other, net	`OtherNoncashIncomeExpense`	$-28.00M	USD	3 Qtrs
Receivables, net	`IncreaseDecreaseInReceivables`	$146.00M	USD	3 Qtrs
Receivables, net	`IncreaseDecreaseInReceivables`	$290.00M	USD	3 Qtrs
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-357.00M	USD	3 Qtrs
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-255.00M	USD	3 Qtrs
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$58.00M	USD	3 Qtrs
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$136.00M	USD	3 Qtrs
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$3.00M	USD	3 Qtrs
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-45.00M	USD	3 Qtrs
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-333.00M	USD	3 Qtrs
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-140.00M	USD	3 Qtrs
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$2.18B	USD	3 Qtrs
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$2.17B	USD	3 Qtrs
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$71.00M	USD	3 Qtrs
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$59.00M	USD	3 Qtrs
Purchases of investments	`PaymentsToAcquireOtherInvestments`	$61.00M	USD	3 Qtrs
Purchases of investments	`PaymentsToAcquireOtherInvestments`	$95.00M	USD	3 Qtrs
Net sales of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$-274.00M	USD	3 Qtrs
Net sales of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$-15.00M	USD	3 Qtrs
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$154.00M	USD	3 Qtrs
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$18.00M	USD	3 Qtrs
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$1.00M	USD	3 Qtrs
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$80.00M	USD	3 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$203.00M	USD	3 Qtrs
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$126.00M	USD	3 Qtrs
Cash provided by (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-209.00M	USD	3 Qtrs
Cash provided by (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$52.00M	USD	3 Qtrs
Share repurchase	`PaymentsForRepurchaseOfEquity`	$2.53B	USD	3 Qtrs
Share repurchase	`PaymentsForRepurchaseOfEquity`	$1.95B	USD	3 Qtrs
Proceeds from issuance of shares	`ProceedsFromIssuanceOfCommonStock`	$63.00M	USD	3 Qtrs
Proceeds from issuance of shares	`ProceedsFromIssuanceOfCommonStock`	$49.00M	USD	3 Qtrs
Cash paid for employee taxes on withholding shares	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$205.00M	USD	3 Qtrs
Cash paid for employee taxes on withholding shares	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$232.00M	USD	3 Qtrs
Commercial paper issuances, net of repayments	`ProceedsFromRepaymentsOfCommercialPaper`	$-425.00M	USD	3 Qtrs
Commercial paper issuances, net of repayments	`ProceedsFromRepaymentsOfCommercialPaper`	$-274.00M	USD	3 Qtrs
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$1.97B	USD	3 Qtrs
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$744.00M	USD	3 Qtrs
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$1.20B	USD	3 Qtrs
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$870.00M	USD	3 Qtrs
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$347.00M	USD	3 Qtrs
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$366.00M	USD	3 Qtrs
Noncontrolling interests and other financing activities	`PaymentsToMinorityShareholders`	$50.00M	USD	3 Qtrs
Noncontrolling interests and other financing activities	`PaymentsToMinorityShareholders`	$56.00M	USD	3 Qtrs
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-339.00M	USD	3 Qtrs
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-1.20B	USD	3 Qtrs
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-1.08B	USD	3 Qtrs
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-57.00M	USD	3 Qtrs
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$968.00M	USD	3 Qtrs
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$550.00M	USD	3 Qtrs
Cash, cash equivalents and funds held on behalf of clients at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.04B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.08B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.20B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.64B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.04B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.08B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.20B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.64B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$690.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$808.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$692.00M	USD	Point-in-time
Cash and cash equivalents classified as held for sale	`DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents`	-	USD	Point-in-time
Cash and cash equivalents classified as held for sale	`DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents`	$6.00M	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$6.50B	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$7.23B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.04B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.08B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.20B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.64B	USD	Point-in-time
Interest paid	`InterestPaidNet`	$309.00M	USD	3 Qtrs
Interest paid	`InterestPaidNet`	$219.00M	USD	3 Qtrs
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$613.00M	USD	3 Qtrs
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$418.00M	USD	3 Qtrs

Stockholders Equity 90 line items

Line Item	Tag	Value	Unit	Period
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.56	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.56	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.61	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.56	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.61	USD	1 Quarter
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.51	USD	1 Quarter
Beginning balance (in shares)	`CommonStockSharesIssued`	205.40M	shares	Point-in-time
Beginning balance (in shares)	`CommonStockSharesIssued`	200.80M	shares	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$58.00M	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$788.00M	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-486.00M	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-670.00M	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-429.00M	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.29B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.16B	USD	Point-in-time
Beginning balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$162.00M	USD	Point-in-time
Net income	`ProfitLoss`	$1.05B	USD	1 Quarter
Net income	`ProfitLoss`	$575.00M	USD	1 Quarter
Net income	`ProfitLoss`	$514.00M	USD	1 Quarter
Net income	`ProfitLoss`	$2.12B	USD	3 Qtrs
Net income	`ProfitLoss`	$418.00M	USD	1 Quarter
Net income	`ProfitLoss`	$467.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.98B	USD	3 Qtrs
Net income	`ProfitLoss`	$1.08B	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-52.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-50.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$14.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-132.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$10.00M	USD	1 Quarter
Shares issued - employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-116.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedDuringPeriodValue`	$850.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedDuringPeriodValue`	$1.20B	USD	1 Quarter
Shares repurchased	`StockRepurchasedDuringPeriodValue`	$550.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedDuringPeriodValue`	$828.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedDuringPeriodValue`	$500.00M	USD	1 Quarter
Shares repurchased	`StockRepurchasedDuringPeriodValue`	$550.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$127.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$119.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$99.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$92.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$95.00M	USD	1 Quarter
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$93.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$127.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$110.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$115.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$118.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$125.00M	USD	1 Quarter
Dividends to shareholders	`DividendsCommonStockCash`	$119.00M	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`	$-9.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$1.00M	USD	1 Quarter
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-16.00M	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`	$8.00M	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`	$6.00M	USD	3 Qtrs
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$54.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-29.00M	USD	3 Qtrs
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-436.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-676.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-7.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-257.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$174.00M	USD	1 Quarter
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-1.12B	USD	3 Qtrs
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-26.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-24.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-33.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-22.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-87.00M	USD	3 Qtrs
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-66.00M	USD	3 Qtrs
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-28.00M	USD	1 Quarter
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-20.00M	USD	1 Quarter
Purchases of subsidiary shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$2.00M	USD	1 Quarter
Purchases of subsidiary shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$2.00M	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$45.00M	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`	$7.00M	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$1.00M	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$1.00M	USD	1 Quarter
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$7.00M	USD	1 Quarter
Ending balance (in shares)	`CommonStockSharesIssued`	205.40M	shares	Point-in-time
Ending balance (in shares)	`CommonStockSharesIssued`	200.80M	shares	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$58.00M	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$788.00M	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-486.00M	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-670.00M	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-429.00M	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.29B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.16B	USD	Point-in-time
Ending balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$162.00M	USD	Point-in-time

Comprehensive Income 56 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$1.05B	USD	1 Quarter
Net income	`ProfitLoss`	$575.00M	USD	1 Quarter
Net income	`ProfitLoss`	$514.00M	USD	1 Quarter
Net income	`ProfitLoss`	$2.12B	USD	3 Qtrs
Net income	`ProfitLoss`	$418.00M	USD	1 Quarter
Net income	`ProfitLoss`	$467.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.98B	USD	3 Qtrs
Net income	`ProfitLoss`	$1.08B	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$10.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$11.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$48.00M	USD	3 Qtrs
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$55.00M	USD	3 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLoss`	$456.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$408.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.93B	USD	3 Qtrs
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.07B	USD	3 Qtrs
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-5.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-9.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$1.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-16.00M	USD	3 Qtrs
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-8.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$8.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$3.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$6.00M	USD	3 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$54.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-29.00M	USD	3 Qtrs
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-436.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-676.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-7.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-257.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$174.00M	USD	1 Quarter
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-1.12B	USD	3 Qtrs
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-26.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-24.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-33.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-22.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-87.00M	USD	3 Qtrs
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-66.00M	USD	3 Qtrs
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-28.00M	USD	1 Quarter
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-20.00M	USD	1 Quarter
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-242.00M	USD	1 Quarter
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$43.00M	USD	3 Qtrs
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-1.05B	USD	3 Qtrs
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-658.00M	USD	1 Quarter
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-1.00M	USD	1 Quarter
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$1.00M	USD	1 Quarter
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	3 Qtrs
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-1.00M	USD	3 Qtrs
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-1.05B	USD	3 Qtrs
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-241.00M	USD	1 Quarter
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-659.00M	USD	1 Quarter
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$44.00M	USD	3 Qtrs
Comprehensive income (loss) attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$884.00M	USD	3 Qtrs
Comprehensive income (loss) attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$2.11B	USD	3 Qtrs
Comprehensive income (loss) attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$-251.00M	USD	1 Quarter
Comprehensive income (loss) attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$215.00M	USD	1 Quarter

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