10-K Filing

AON PLC CIK: 315293 FY 2024

Filing Information

Form Type	10-K
Accession Number	`0001628280-25-006093`
Period End Date	20241231
Filing Date	20250218
Fiscal Year	2024
Fiscal Period	FY
XBRL Instance	aon-20241231_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 156 Income Statement 132 Cash Flow Statement 252 Stockholders Equity 104 Comprehensive Income 60

Balance Sheet 156 line items

Line Item	Tag	Value	Unit	Period
Ordinary shares, nominal value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Ordinary shares, nominal value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Ordinary shares, nominal value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Ordinary shares, nominal value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Ordinary shares, authorized shares (in Shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Ordinary shares, authorized shares (in Shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Ordinary shares, authorized shares (in Shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Ordinary shares, authorized shares (in Shares)	`CommonStockSharesAuthorized`	500.00M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$778.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$778.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.08B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.08B	USD	Point-in-time
Ordinary shares, issued shares (in Shares)	`CommonStockSharesIssued`	198.60M	shares	Point-in-time
Ordinary shares, issued shares (in Shares)	`CommonStockSharesIssued`	198.60M	shares	Point-in-time
Ordinary shares, issued shares (in Shares)	`CommonStockSharesIssued`	216.00M	shares	Point-in-time
Ordinary shares, issued shares (in Shares)	`CommonStockSharesIssued`	216.00M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$690.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$690.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$219.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$219.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$369.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$369.00M	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.25B	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.25B	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.80B	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.80B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$16.31B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$16.31B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$17.57B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$17.57B	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$996.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$996.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$759.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$759.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$21.70B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$21.70B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$23.43B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$23.43B	USD	Point-in-time
Goodwill	`Goodwill`	$15.23B	USD	Point-in-time
Goodwill	`Goodwill`	$15.23B	USD	Point-in-time
Goodwill	`Goodwill`	$8.41B	USD	Point-in-time
Goodwill	`Goodwill`	$8.41B	USD	Point-in-time
Goodwill	`Goodwill`	$8.29B	USD	Point-in-time
Goodwill	`Goodwill`	$8.29B	USD	Point-in-time
Intangible assets, net	`FiniteLivedIntangibleAssetsNet`	$234.00M	USD	Point-in-time
Intangible assets, net	`FiniteLivedIntangibleAssetsNet`	$234.00M	USD	Point-in-time
Intangible assets, net	`FiniteLivedIntangibleAssetsNet`	$6.74B	USD	Point-in-time
Intangible assets, net	`FiniteLivedIntangibleAssetsNet`	$6.74B	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$637.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$637.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$638.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$638.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$711.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$711.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$650.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$650.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$1.20B	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$1.20B	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$654.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$654.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$618.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$618.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$556.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$556.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$506.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$506.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$998.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$998.00M	USD	Point-in-time
Total assets	`Assets`	$48.97B	USD	Point-in-time
Total assets	`Assets`	$48.97B	USD	Point-in-time
Total assets	`Assets`	$33.96B	USD	Point-in-time
Total assets	`Assets`	$33.96B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.90B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.90B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.26B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.26B	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$1.20B	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$1.20B	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$751.00M	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$751.00M	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$16.31B	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$16.31B	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$17.57B	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$17.57B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.88B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.88B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.77B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.77B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$21.65B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$21.65B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$23.00B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$23.00B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$16.27B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$16.27B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$9.99B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$9.99B	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$641.00M	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$641.00M	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$685.00M	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$685.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$319.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$319.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$115.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$115.00M	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.13B	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.13B	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.23B	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.23B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$1.07B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$1.07B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$1.14B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$1.14B	USD	Point-in-time
Total liabilities	`Liabilities`	$34.70B	USD	Point-in-time
Total liabilities	`Liabilities`	$34.70B	USD	Point-in-time
Total liabilities	`Liabilities`	$42.53B	USD	Point-in-time
Total liabilities	`Liabilities`	$42.53B	USD	Point-in-time
Redeemable noncontrolling interests	`RedeemableNoncontrollingInterestEquityCarryingAmount`	-	USD	Point-in-time
Redeemable noncontrolling interests	`RedeemableNoncontrollingInterestEquityCarryingAmount`	-	USD	Point-in-time
Redeemable noncontrolling interests	`RedeemableNoncontrollingInterestEquityCarryingAmount`	$125.00M	USD	Point-in-time
Redeemable noncontrolling interests	`RedeemableNoncontrollingInterestEquityCarryingAmount`	$125.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2024 - 216.0; 2023 - 198.6)	`CommonStockValue`	$2.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2024 - 216.0; 2023 - 198.6)	`CommonStockValue`	$2.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2024 - 216.0; 2023 - 198.6)	`CommonStockValue`	$2.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2024 - 216.0; 2023 - 198.6)	`CommonStockValue`	$2.00M	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$6.94B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$6.94B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$13.17B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$13.17B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-2.31B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-2.31B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-3.40B	USD	Point-in-time
Accumulated deficit	`RetainedEarningsAccumulatedDeficit`	$-3.40B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-4.75B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-4.75B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-4.37B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-4.37B	USD	Point-in-time
Total Aon shareholders' equity (deficit)	`StockholdersEquity`	$6.12B	USD	Point-in-time
Total Aon shareholders' equity (deficit)	`StockholdersEquity`	$6.12B	USD	Point-in-time
Total Aon shareholders' equity (deficit)	`StockholdersEquity`	$-826.00M	USD	Point-in-time
Total Aon shareholders' equity (deficit)	`StockholdersEquity`	$-826.00M	USD	Point-in-time
Nonredeemable noncontrolling interests	`NonredeemableNoncontrollingInterest`	$84.00M	USD	Point-in-time
Nonredeemable noncontrolling interests	`NonredeemableNoncontrollingInterest`	$84.00M	USD	Point-in-time
Nonredeemable noncontrolling interests	`NonredeemableNoncontrollingInterest`	$184.00M	USD	Point-in-time
Nonredeemable noncontrolling interests	`NonredeemableNoncontrollingInterest`	$184.00M	USD	Point-in-time
Total equity (deficit)	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.16B	USD	Point-in-time
Total equity (deficit)	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.16B	USD	Point-in-time
Total equity (deficit)	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.30B	USD	Point-in-time
Total equity (deficit)	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.30B	USD	Point-in-time
Total equity (deficit)	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-429.00M	USD	Point-in-time
Total equity (deficit)	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-429.00M	USD	Point-in-time
Total equity (deficit)	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-742.00M	USD	Point-in-time
Total equity (deficit)	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-742.00M	USD	Point-in-time
Total liabilities, redeemable noncontrolling interests, and equity (deficit)	`LiabilitiesAndStockholdersEquity`	$33.96B	USD	Point-in-time
Total liabilities, redeemable noncontrolling interests, and equity (deficit)	`LiabilitiesAndStockholdersEquity`	$33.96B	USD	Point-in-time
Total liabilities, redeemable noncontrolling interests, and equity (deficit)	`LiabilitiesAndStockholdersEquity`	$48.97B	USD	Point-in-time
Total liabilities, redeemable noncontrolling interests, and equity (deficit)	`LiabilitiesAndStockholdersEquity`	$48.97B	USD	Point-in-time

Income Statement 132 line items

Line Item	Tag	Value	Unit	Period
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$12.48B	USD	Annual
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$12.48B	USD	Annual
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$15.70B	USD	Annual
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$15.70B	USD	Annual
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$13.38B	USD	Annual
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$13.38B	USD	Annual
Compensation and benefits	`LaborAndRelatedExpense`	$6.90B	USD	Annual
Compensation and benefits	`LaborAndRelatedExpense`	$6.90B	USD	Annual
Compensation and benefits	`LaborAndRelatedExpense`	$6.48B	USD	Annual
Compensation and benefits	`LaborAndRelatedExpense`	$6.48B	USD	Annual
Compensation and benefits	`LaborAndRelatedExpense`	$8.28B	USD	Annual
Compensation and benefits	`LaborAndRelatedExpense`	$8.28B	USD	Annual
Information technology	`InformationTechnologyAndDataProcessing`	$539.00M	USD	Annual
Information technology	`InformationTechnologyAndDataProcessing`	$539.00M	USD	Annual
Information technology	`InformationTechnologyAndDataProcessing`	$534.00M	USD	Annual
Information technology	`InformationTechnologyAndDataProcessing`	$534.00M	USD	Annual
Information technology	`InformationTechnologyAndDataProcessing`	$509.00M	USD	Annual
Information technology	`InformationTechnologyAndDataProcessing`	$509.00M	USD	Annual
Premises	`OccupancyNet`	$325.00M	USD	Annual
Premises	`OccupancyNet`	$325.00M	USD	Annual
Premises	`OccupancyNet`	$294.00M	USD	Annual
Premises	`OccupancyNet`	$294.00M	USD	Annual
Premises	`OccupancyNet`	$289.00M	USD	Annual
Premises	`OccupancyNet`	$289.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$151.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$151.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$167.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$167.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$183.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$183.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$503.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$503.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$113.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$113.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$89.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$89.00M	USD	Annual
Other general expense	`OtherGeneralExpenses`	$1.47B	USD	Annual
Other general expense	`OtherGeneralExpenses`	$1.47B	USD	Annual
Other general expense	`OtherGeneralExpenses`	$1.64B	USD	Annual
Other general expense	`OtherGeneralExpenses`	$1.64B	USD	Annual
Other general expense	`OtherGeneralExpenses`	$1.27B	USD	Annual
Other general expense	`OtherGeneralExpenses`	$1.27B	USD	Annual
Accelerating Aon United Program expenses	`RestructuringCharges`	-	USD	Annual
Accelerating Aon United Program expenses	`RestructuringCharges`	-	USD	Annual
Accelerating Aon United Program expenses	`RestructuringCharges`	$135.00M	USD	Annual
Accelerating Aon United Program expenses	`RestructuringCharges`	$135.00M	USD	Annual
Accelerating Aon United Program expenses	`RestructuringCharges`	$389.00M	USD	Annual
Accelerating Aon United Program expenses	`RestructuringCharges`	$389.00M	USD	Annual
Total operating expenses	`CostsAndExpenses`	$8.81B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$8.81B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$9.59B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$9.59B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$11.86B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$11.86B	USD	Annual
Operating income	`OperatingIncomeLoss`	$3.83B	USD	Annual
Operating income	`OperatingIncomeLoss`	$3.83B	USD	Annual
Operating income	`OperatingIncomeLoss`	$3.79B	USD	Annual
Operating income	`OperatingIncomeLoss`	$3.79B	USD	Annual
Operating income	`OperatingIncomeLoss`	$3.67B	USD	Annual
Operating income	`OperatingIncomeLoss`	$3.67B	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$67.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$67.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$18.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$18.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$31.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$31.00M	USD	Annual
Interest expense	`InterestExpenseNonoperating`	$406.00M	USD	Annual
Interest expense	`InterestExpenseNonoperating`	$406.00M	USD	Annual
Interest expense	`InterestExpenseNonoperating`	$484.00M	USD	Annual
Interest expense	`InterestExpenseNonoperating`	$484.00M	USD	Annual
Interest expense	`InterestExpenseNonoperating`	$788.00M	USD	Annual
Interest expense	`InterestExpenseNonoperating`	$788.00M	USD	Annual
Other income (expense)	`OtherNonoperatingIncomeExpense`	$-125.00M	USD	Annual
Other income (expense)	`OtherNonoperatingIncomeExpense`	$-125.00M	USD	Annual
Other income (expense)	`OtherNonoperatingIncomeExpense`	$348.00M	USD	Annual
Other income (expense)	`OtherNonoperatingIncomeExpense`	$348.00M	USD	Annual
Other income (expense)	`OtherNonoperatingIncomeExpense`	$-163.00M	USD	Annual
Other income (expense)	`OtherNonoperatingIncomeExpense`	$-163.00M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$3.46B	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$3.46B	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$3.17B	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$3.17B	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$3.16B	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$3.16B	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$541.00M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$541.00M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$742.00M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$742.00M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$510.00M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$510.00M	USD	Annual
Net income	`ProfitLoss`	$2.72B	USD	Annual
Net income	`ProfitLoss`	$2.72B	USD	Annual
Net income	`ProfitLoss`	$2.63B	USD	Annual
Net income	`ProfitLoss`	$2.63B	USD	Annual
Net income	`ProfitLoss`	$2.65B	USD	Annual
Net income	`ProfitLoss`	$2.65B	USD	Annual
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$64.00M	USD	Annual
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$64.00M	USD	Annual
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$66.00M	USD	Annual
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$66.00M	USD	Annual
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$57.00M	USD	Annual
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$57.00M	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.65B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.65B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.56B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.56B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.59B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.59B	USD	Annual
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$12.55	USD	Annual
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$12.55	USD	Annual
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$12.60	USD	Annual
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$12.60	USD	Annual
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$12.23	USD	Annual
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$12.23	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$12.51	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$12.51	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$12.49	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$12.49	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$12.14	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$12.14	USD	Annual
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	203.50M	shares	Annual
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	203.50M	shares	Annual
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	211.70M	shares	Annual
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	211.70M	shares	Annual
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	211.40M	shares	Annual
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	211.40M	shares	Annual
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	205.00M	shares	Annual
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	205.00M	shares	Annual
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	212.50M	shares	Annual
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	212.50M	shares	Annual
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	213.20M	shares	Annual
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	213.20M	shares	Annual

Cash Flow Statement 252 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$2.72B	USD	Annual
Net income	`ProfitLoss`	$2.72B	USD	Annual
Net income	`ProfitLoss`	$2.63B	USD	Annual
Net income	`ProfitLoss`	$2.63B	USD	Annual
Net income	`ProfitLoss`	$2.65B	USD	Annual
Net income	`ProfitLoss`	$2.65B	USD	Annual
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$337.00M	USD	Annual
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$337.00M	USD	Annual
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$4.00M	USD	Annual
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$4.00M	USD	Annual
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$54.00M	USD	Annual
Gain from sales of businesses	`GainLossOnSaleOfBusiness`	$54.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$151.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$151.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$167.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$167.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$183.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$183.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$503.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$503.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$113.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$113.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$89.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$89.00M	USD	Annual
Share-based compensation expense	`ShareBasedCompensation`	$474.00M	USD	Annual
Share-based compensation expense	`ShareBasedCompensation`	$474.00M	USD	Annual
Share-based compensation expense	`ShareBasedCompensation`	$438.00M	USD	Annual
Share-based compensation expense	`ShareBasedCompensation`	$438.00M	USD	Annual
Share-based compensation expense	`ShareBasedCompensation`	$397.00M	USD	Annual
Share-based compensation expense	`ShareBasedCompensation`	$397.00M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-311.00M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-311.00M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-373.00M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-373.00M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-252.00M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-252.00M	USD	Annual
Other, net	`OtherNoncashIncomeExpense`	$134.00M	USD	Annual
Other, net	`OtherNoncashIncomeExpense`	$134.00M	USD	Annual
Other, net	`OtherNoncashIncomeExpense`	$-28.00M	USD	Annual
Other, net	`OtherNoncashIncomeExpense`	$-28.00M	USD	Annual
Other, net	`OtherNoncashIncomeExpense`	$-170.00M	USD	Annual
Other, net	`OtherNoncashIncomeExpense`	$-170.00M	USD	Annual
Receivables, net	`IncreaseDecreaseInReceivables`	$188.00M	USD	Annual
Receivables, net	`IncreaseDecreaseInReceivables`	$188.00M	USD	Annual
Receivables, net	`IncreaseDecreaseInReceivables`	$312.00M	USD	Annual
Receivables, net	`IncreaseDecreaseInReceivables`	$312.00M	USD	Annual
Receivables, net	`IncreaseDecreaseInReceivables`	$96.00M	USD	Annual
Receivables, net	`IncreaseDecreaseInReceivables`	$96.00M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$13.00M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$13.00M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$393.00M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$393.00M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-22.00M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-22.00M	USD	Annual
Accelerating Aon United Program liabilities	`IncreaseDecreaseInRestructuringReserve`	-	USD	Annual
Accelerating Aon United Program liabilities	`IncreaseDecreaseInRestructuringReserve`	-	USD	Annual
Accelerating Aon United Program liabilities	`IncreaseDecreaseInRestructuringReserve`	$17.00M	USD	Annual
Accelerating Aon United Program liabilities	`IncreaseDecreaseInRestructuringReserve`	$17.00M	USD	Annual
Accelerating Aon United Program liabilities	`IncreaseDecreaseInRestructuringReserve`	$99.00M	USD	Annual
Accelerating Aon United Program liabilities	`IncreaseDecreaseInRestructuringReserve`	$99.00M	USD	Annual
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	-	USD	Annual
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	-	USD	Annual
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$216.00M	USD	Annual
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$216.00M	USD	Annual
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$174.00M	USD	Annual
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$174.00M	USD	Annual
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-53.00M	USD	Annual
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-53.00M	USD	Annual
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$8.00M	USD	Annual
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$8.00M	USD	Annual
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-18.00M	USD	Annual
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-18.00M	USD	Annual
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-3.00M	USD	Annual
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-3.00M	USD	Annual
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-356.00M	USD	Annual
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-356.00M	USD	Annual
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$143.00M	USD	Annual
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$143.00M	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$3.22B	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$3.22B	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$3.04B	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$3.04B	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$3.44B	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$3.44B	USD	Annual
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$76.00M	USD	Annual
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$76.00M	USD	Annual
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$212.00M	USD	Annual
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$212.00M	USD	Annual
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$110.00M	USD	Annual
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$110.00M	USD	Annual
Purchases of investments	`PaymentsToAcquireOtherInvestments`	$67.00M	USD	Annual
Purchases of investments	`PaymentsToAcquireOtherInvestments`	$67.00M	USD	Annual
Purchases of investments	`PaymentsToAcquireOtherInvestments`	$107.00M	USD	Annual
Purchases of investments	`PaymentsToAcquireOtherInvestments`	$107.00M	USD	Annual
Purchases of investments	`PaymentsToAcquireOtherInvestments`	$172.00M	USD	Annual
Purchases of investments	`PaymentsToAcquireOtherInvestments`	$172.00M	USD	Annual
Net sales of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$175.00M	USD	Annual
Net sales of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$175.00M	USD	Annual
Net sales of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$-151.00M	USD	Annual
Net sales of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$-151.00M	USD	Annual
Net sales of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$-85.00M	USD	Annual
Net sales of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$-85.00M	USD	Annual
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$3.51B	USD	Annual
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$3.51B	USD	Annual
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$162.00M	USD	Annual
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$162.00M	USD	Annual
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$35.00M	USD	Annual
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$35.00M	USD	Annual
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$700.00M	USD	Annual
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$700.00M	USD	Annual
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$5.00M	USD	Annual
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$5.00M	USD	Annual
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$81.00M	USD	Annual
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$81.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$196.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$196.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$218.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$218.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$252.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$252.00M	USD	Annual
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-2.83B	USD	Annual
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-2.83B	USD	Annual
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-449.00M	USD	Annual
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-449.00M	USD	Annual
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-188.00M	USD	Annual
Cash used for investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-188.00M	USD	Annual
Share repurchase	`PaymentsForRepurchaseOfEquity`	$1.00B	USD	Annual
Share repurchase	`PaymentsForRepurchaseOfEquity`	$1.00B	USD	Annual
Share repurchase	`PaymentsForRepurchaseOfEquity`	$3.20B	USD	Annual
Share repurchase	`PaymentsForRepurchaseOfEquity`	$3.20B	USD	Annual
Share repurchase	`PaymentsForRepurchaseOfEquity`	$2.70B	USD	Annual
Share repurchase	`PaymentsForRepurchaseOfEquity`	$2.70B	USD	Annual
Proceeds from issuance of shares	`ProceedsFromIssuanceOfCommonStock`	$72.00M	USD	Annual
Proceeds from issuance of shares	`ProceedsFromIssuanceOfCommonStock`	$72.00M	USD	Annual
Proceeds from issuance of shares	`ProceedsFromIssuanceOfCommonStock`	$79.00M	USD	Annual
Proceeds from issuance of shares	`ProceedsFromIssuanceOfCommonStock`	$79.00M	USD	Annual
Proceeds from issuance of shares	`ProceedsFromIssuanceOfCommonStock`	$58.00M	USD	Annual
Proceeds from issuance of shares	`ProceedsFromIssuanceOfCommonStock`	$58.00M	USD	Annual
Cash paid for employee taxes on withholding shares	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$215.00M	USD	Annual
Cash paid for employee taxes on withholding shares	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$215.00M	USD	Annual
Cash paid for employee taxes on withholding shares	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$202.00M	USD	Annual
Cash paid for employee taxes on withholding shares	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$202.00M	USD	Annual
Cash paid for employee taxes on withholding shares	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$241.00M	USD	Annual
Cash paid for employee taxes on withholding shares	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$241.00M	USD	Annual
Commercial paper issuances, net of repayments	`ProceedsFromRepaymentsOfCommercialPaper`	$-27.00M	USD	Annual
Commercial paper issuances, net of repayments	`ProceedsFromRepaymentsOfCommercialPaper`	$-27.00M	USD	Annual
Commercial paper issuances, net of repayments	`ProceedsFromRepaymentsOfCommercialPaper`	$-591.00M	USD	Annual
Commercial paper issuances, net of repayments	`ProceedsFromRepaymentsOfCommercialPaper`	$-591.00M	USD	Annual
Commercial paper issuances, net of repayments	`ProceedsFromRepaymentsOfCommercialPaper`	$-65.00M	USD	Annual
Commercial paper issuances, net of repayments	`ProceedsFromRepaymentsOfCommercialPaper`	$-65.00M	USD	Annual
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$1.97B	USD	Annual
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$1.97B	USD	Annual
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$744.00M	USD	Annual
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$744.00M	USD	Annual
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$7.93B	USD	Annual
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$7.93B	USD	Annual
Repayment of debt	`RepaymentsOfLongTermDebt`	$350.00M	USD	Annual
Repayment of debt	`RepaymentsOfLongTermDebt`	$350.00M	USD	Annual
Repayment of debt	`RepaymentsOfLongTermDebt`	$500.00M	USD	Annual
Repayment of debt	`RepaymentsOfLongTermDebt`	$500.00M	USD	Annual
Repayment of debt	`RepaymentsOfLongTermDebt`	$4.93B	USD	Annual
Repayment of debt	`RepaymentsOfLongTermDebt`	$4.93B	USD	Annual
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$702.00M	USD	Annual
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$702.00M	USD	Annual
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$280.00M	USD	Annual
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$280.00M	USD	Annual
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$358.00M	USD	Annual
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$358.00M	USD	Annual
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$489.00M	USD	Annual
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$489.00M	USD	Annual
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$562.00M	USD	Annual
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$562.00M	USD	Annual
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$463.00M	USD	Annual
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$463.00M	USD	Annual
Redeemable and non-redeemable noncontrolling interests, and other financing activities	`ProceedsFromPaymentsForNoncontrollingInterestsAndOtherFinancingActivities`	$-232.00M	USD	Annual
Redeemable and non-redeemable noncontrolling interests, and other financing activities	`ProceedsFromPaymentsForNoncontrollingInterestsAndOtherFinancingActivities`	$-232.00M	USD	Annual
Redeemable and non-redeemable noncontrolling interests, and other financing activities	`ProceedsFromPaymentsForNoncontrollingInterestsAndOtherFinancingActivities`	$-206.00M	USD	Annual
Redeemable and non-redeemable noncontrolling interests, and other financing activities	`ProceedsFromPaymentsForNoncontrollingInterestsAndOtherFinancingActivities`	$-206.00M	USD	Annual
Redeemable and non-redeemable noncontrolling interests, and other financing activities	`ProceedsFromPaymentsForNoncontrollingInterestsAndOtherFinancingActivities`	$-71.00M	USD	Annual
Redeemable and non-redeemable noncontrolling interests, and other financing activities	`ProceedsFromPaymentsForNoncontrollingInterestsAndOtherFinancingActivities`	$-71.00M	USD	Annual
Cash provided by (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-1.79B	USD	Annual
Cash provided by (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-1.79B	USD	Annual
Cash provided by (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-2.87B	USD	Annual
Cash provided by (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-2.87B	USD	Annual
Cash provided by (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$796.00M	USD	Annual
Cash provided by (used for) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$796.00M	USD	Annual
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-387.00M	USD	Annual
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-387.00M	USD	Annual
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-549.00M	USD	Annual
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-549.00M	USD	Annual
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$264.00M	USD	Annual
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$264.00M	USD	Annual
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$611.00M	USD	Annual
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$611.00M	USD	Annual
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$431.00M	USD	Annual
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$431.00M	USD	Annual
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$646.00M	USD	Annual
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$646.00M	USD	Annual
Cash, cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.72B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.72B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.33B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.33B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.08B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.08B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.64B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.64B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.72B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.72B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.33B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.33B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.08B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.08B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.64B	USD	Point-in-time
Cash, cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.64B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$778.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$778.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.08B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$1.08B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$690.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$690.00M	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients classified as held for sale	`DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents`	$1.00M	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients classified as held for sale	`DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents`	$1.00M	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients classified as held for sale	`DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents`	$43.00M	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients classified as held for sale	`DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents`	$43.00M	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients classified as held for sale	`DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents`	-	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients classified as held for sale	`DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents`	-	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$6.90B	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$6.90B	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$6.39B	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$6.39B	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$7.25B	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$7.25B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.72B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.72B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.33B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$8.33B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.08B	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`	$6.64B	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`	$351.00M	USD	Annual
Interest paid	`InterestPaidNet`	$351.00M	USD	Annual
Interest paid	`InterestPaidNet`	$446.00M	USD	Annual
Interest paid	`InterestPaidNet`	$446.00M	USD	Annual
Interest paid	`InterestPaidNet`	$658.00M	USD	Annual
Interest paid	`InterestPaidNet`	$658.00M	USD	Annual
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$546.00M	USD	Annual
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$546.00M	USD	Annual
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$1.05B	USD	Annual
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$1.05B	USD	Annual
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$740.00M	USD	Annual
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$740.00M	USD	Annual

Stockholders Equity 104 line items

Line Item	Tag	Value	Unit	Period
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$2.41	USD	Annual
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$2.41	USD	Annual
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$2.64	USD	Annual
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$2.64	USD	Annual
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$2.19	USD	Annual
Dividends (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$2.19	USD	Annual
Net income	`ProfitLoss`	$2.72B	USD	Annual
Net income	`ProfitLoss`	$2.72B	USD	Annual
Net income	`ProfitLoss`	$2.63B	USD	Annual
Net income	`ProfitLoss`	$2.63B	USD	Annual
Net income	`ProfitLoss`	$2.65B	USD	Annual
Net income	`ProfitLoss`	$2.65B	USD	Annual
Net income related to redeemable noncontrolling interest	`NetIncomeLossAttributableToRedeemableNoncontrollingInterest`	$5.00M	USD	Annual
Net income related to redeemable noncontrolling interest	`NetIncomeLossAttributableToRedeemableNoncontrollingInterest`	$5.00M	USD	Annual
Beginning Balance (in shares)	`CommonStockSharesIssued`	198.60M	shares	Point-in-time
Beginning Balance (in shares)	`CommonStockSharesIssued`	198.60M	shares	Point-in-time
Beginning Balance (in shares)	`CommonStockSharesIssued`	216.00M	shares	Point-in-time
Beginning Balance (in shares)	`CommonStockSharesIssued`	216.00M	shares	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.16B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.16B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.30B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.30B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-429.00M	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-429.00M	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-742.00M	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-742.00M	USD	Point-in-time
Net income	`ProfitLoss`	$2.72B	USD	Annual
Net income	`ProfitLoss`	$2.72B	USD	Annual
Net income	`ProfitLoss`	$2.63B	USD	Annual
Net income	`ProfitLoss`	$2.63B	USD	Annual
Net income	`ProfitLoss`	$2.65B	USD	Annual
Net income	`ProfitLoss`	$2.65B	USD	Annual
Net income	`NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest`	$2.71B	USD	Annual
Net income	`NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest`	$2.71B	USD	Annual
Shares issued - NFP Transaction	`StockIssuedDuringPeriodValueAcquisitions`	$5.88B	USD	Annual
Shares issued - NFP Transaction	`StockIssuedDuringPeriodValueAcquisitions`	$5.88B	USD	Annual
Shares issued employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-157.00M	USD	Annual
Shares issued employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-157.00M	USD	Annual
Shares issued employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-124.00M	USD	Annual
Shares issued employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-124.00M	USD	Annual
Shares issued employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-169.00M	USD	Annual
Shares issued employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-169.00M	USD	Annual
Shares repurchased	`StockRepurchasedDuringPeriodValue`	$3.20B	USD	Annual
Shares repurchased	`StockRepurchasedDuringPeriodValue`	$3.20B	USD	Annual
Shares repurchased	`StockRepurchasedDuringPeriodValue`	$1.00B	USD	Annual
Shares repurchased	`StockRepurchasedDuringPeriodValue`	$1.00B	USD	Annual
Shares repurchased	`StockRepurchasedDuringPeriodValue`	$2.70B	USD	Annual
Shares repurchased	`StockRepurchasedDuringPeriodValue`	$2.70B	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$474.00M	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$474.00M	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$397.00M	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$397.00M	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$438.00M	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$438.00M	USD	Annual
Dividends to shareholders	`DividendsCommonStockCash`	$490.00M	USD	Annual
Dividends to shareholders	`DividendsCommonStockCash`	$490.00M	USD	Annual
Dividends to shareholders	`DividendsCommonStockCash`	$463.00M	USD	Annual
Dividends to shareholders	`DividendsCommonStockCash`	$463.00M	USD	Annual
Dividends to shareholders	`DividendsCommonStockCash`	$563.00M	USD	Annual
Dividends to shareholders	`DividendsCommonStockCash`	$563.00M	USD	Annual
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$13.00M	USD	Annual
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$13.00M	USD	Annual
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$72.00M	USD	Annual
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$72.00M	USD	Annual
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-13.00M	USD	Annual
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-13.00M	USD	Annual
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$276.00M	USD	Annual
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$276.00M	USD	Annual
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-528.00M	USD	Annual
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-528.00M	USD	Annual
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-467.00M	USD	Annual
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-467.00M	USD	Annual
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$40.00M	USD	Annual
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$40.00M	USD	Annual
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$211.00M	USD	Annual
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$211.00M	USD	Annual
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-23.00M	USD	Annual
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-23.00M	USD	Annual
Net purchases of shares from nonredeemable noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$-83.00M	USD	Annual
Net purchases of shares from nonredeemable noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$-83.00M	USD	Annual
Net purchases of shares from nonredeemable noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$213.00M	USD	Annual
Net purchases of shares from nonredeemable noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$213.00M	USD	Annual
Net purchases of shares from nonredeemable noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$2.00M	USD	Annual
Net purchases of shares from nonredeemable noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$2.00M	USD	Annual
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$45.00M	USD	Annual
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$45.00M	USD	Annual
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$56.00M	USD	Annual
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$56.00M	USD	Annual
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$53.00M	USD	Annual
Dividends paid to nonredeemable noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$53.00M	USD	Annual
Adjustments to redeemable noncontrolling interests	`MinorityInterestChangeInRedemptionValue`	$-3.00M	USD	Annual
Adjustments to redeemable noncontrolling interests	`MinorityInterestChangeInRedemptionValue`	$-3.00M	USD	Annual
Ending Balance (in shares)	`CommonStockSharesIssued`	198.60M	shares	Point-in-time
Ending Balance (in shares)	`CommonStockSharesIssued`	198.60M	shares	Point-in-time
Ending Balance (in shares)	`CommonStockSharesIssued`	216.00M	shares	Point-in-time
Ending Balance (in shares)	`CommonStockSharesIssued`	216.00M	shares	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.16B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.16B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.30B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.30B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-429.00M	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-429.00M	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-742.00M	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$-742.00M	USD	Point-in-time

Comprehensive Income 60 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$2.72B	USD	Annual
Net income	`ProfitLoss`	$2.72B	USD	Annual
Net income	`ProfitLoss`	$2.63B	USD	Annual
Net income	`ProfitLoss`	$2.63B	USD	Annual
Net income	`ProfitLoss`	$2.65B	USD	Annual
Net income	`ProfitLoss`	$2.65B	USD	Annual
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$64.00M	USD	Annual
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$64.00M	USD	Annual
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$66.00M	USD	Annual
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$66.00M	USD	Annual
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$57.00M	USD	Annual
Less: Net income attributable to redeemable and nonredeemable noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$57.00M	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.65B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.65B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.56B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.56B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.59B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$2.59B	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$13.00M	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$13.00M	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$72.00M	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$72.00M	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-13.00M	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-13.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$276.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$276.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-528.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-528.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-467.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-467.00M	USD	Annual
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$40.00M	USD	Annual
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$40.00M	USD	Annual
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$211.00M	USD	Annual
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$211.00M	USD	Annual
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-23.00M	USD	Annual
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-23.00M	USD	Annual
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$249.00M	USD	Annual
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$249.00M	USD	Annual
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-372.00M	USD	Annual
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-372.00M	USD	Annual
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-752.00M	USD	Annual
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-752.00M	USD	Annual
Less: Other comprehensive loss attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	Annual
Less: Other comprehensive loss attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	Annual
Less: Other comprehensive loss attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	Annual
Less: Other comprehensive loss attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	Annual
Less: Other comprehensive loss attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-1.00M	USD	Annual
Less: Other comprehensive loss attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-1.00M	USD	Annual
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-372.00M	USD	Annual
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-372.00M	USD	Annual
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$250.00M	USD	Annual
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$250.00M	USD	Annual
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-752.00M	USD	Annual
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-752.00M	USD	Annual
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$1.84B	USD	Annual
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$1.84B	USD	Annual
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$2.28B	USD	Annual
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$2.28B	USD	Annual
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$2.81B	USD	Annual
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$2.81B	USD	Annual

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