10-K Filing

AON PLC CIK: 315293 FY 2021

Filing Information

Form Type	10-K
Accession Number	`0001628280-22-003180`
Period End Date	20211231
Filing Date	20220218
Fiscal Year	2021
Fiscal Period	FY
XBRL Instance	aon-20211231_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 76 Income Statement 63 Cash Flow Statement 135 Stockholders Equity 44 Comprehensive Income 30

Balance Sheet 76 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
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$544.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$884.00M	USD	Point-in-time
Ordinary shares, issued shares (in Shares)	`CommonStockSharesIssued`	225.50M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$790.00M	USD	Point-in-time
Ordinary shares, issued shares (in Shares)	`CommonStockSharesIssued`	214.80M	shares	Point-in-time
Short-term investments	`ShortTermInvestments`	$308.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$292.00M	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.07B	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$3.09B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$13.80B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$14.39B	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$716.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$624.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$18.68B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$19.03B	USD	Point-in-time
Goodwill	`Goodwill`	$8.67B	USD	Point-in-time
Goodwill	`Goodwill`	$8.16B	USD	Point-in-time
Goodwill	`Goodwill`	$8.43B	USD	Point-in-time
Intangible assets, net	`IntangibleAssetsNetExcludingGoodwill`	$492.00M	USD	Point-in-time
Intangible assets, net	`IntangibleAssetsNetExcludingGoodwill`	$640.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$599.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$529.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$911.00M	USD	Point-in-time
Operating lease right-of-use assets	`OperatingLeaseRightOfUseAsset`	$786.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$766.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$724.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$1.28B	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$1.37B	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$512.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$610.00M	USD	Point-in-time
Total assets	`Assets`	$31.92B	USD	Point-in-time
Total assets	`Assets`	$32.11B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.19B	USD	Point-in-time
Accounts payable and accrued liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$2.02B	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$1.16B	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$448.00M	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$14.39B	USD	Point-in-time
Fiduciary liabilities	`FiduciaryLiabilities`	$13.80B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.33B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$1.17B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$19.07B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$17.43B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$7.28B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$8.23B	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$897.00M	USD	Point-in-time
Non-current operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$772.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$401.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$262.00M	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.76B	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.38B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$910.00M	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$895.00M	USD	Point-in-time
Total liabilities	`Liabilities`	$30.76B	USD	Point-in-time
Total liabilities	`Liabilities`	$28.53B	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2021 - 214.8; 2020 - 225.5)	`CommonStockValue`	$2.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 500.0 shares (issued: 2021 - 214.8; 2020 - 225.5)	`CommonStockValue`	$2.00M	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$6.62B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$6.31B	USD	Point-in-time
Retained earnings (accumulated deficit)	`RetainedEarningsAccumulatedDeficit`	$-1.69B	USD	Point-in-time
Retained earnings (accumulated deficit)	`RetainedEarningsAccumulatedDeficit`	$1.04B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-3.86B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-3.87B	USD	Point-in-time
Total Aon shareholders' equity	`StockholdersEquity`	$3.50B	USD	Point-in-time
Total Aon shareholders' equity	`StockholdersEquity`	$1.06B	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$97.00M	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$88.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.58B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.16B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.45B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.22B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$32.11B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$31.92B	USD	Point-in-time

Income Statement 63 line items

Line Item	Tag	Value	Unit	Period
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$11.07B	USD	Annual
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$12.19B	USD	Annual
Total revenue	`RevenueFromContractWithCustomerExcludingAssessedTax`	$11.01B	USD	Annual
Compensation and benefits	`LaborAndRelatedExpense`	$5.91B	USD	Annual
Compensation and benefits	`LaborAndRelatedExpense`	$6.74B	USD	Annual
Compensation and benefits	`LaborAndRelatedExpense`	$6.05B	USD	Annual
Information technology	`InformationTechnologyAndDataProcessing`	$477.00M	USD	Annual
Information technology	`InformationTechnologyAndDataProcessing`	$494.00M	USD	Annual
Information technology	`InformationTechnologyAndDataProcessing`	$444.00M	USD	Annual
Premises	`OccupancyNet`	$291.00M	USD	Annual
Premises	`OccupancyNet`	$327.00M	USD	Annual
Premises	`OccupancyNet`	$339.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$172.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$179.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$167.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$147.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$246.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationAndImpairmentOfIntangibleAssets`	$392.00M	USD	Annual
Other general expense	`OtherGeneralExpenses`	$1.23B	USD	Annual
Other general expense	`OtherGeneralExpenses`	$1.39B	USD	Annual
Other general expense	`OtherGeneralExpenses`	$2.23B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$10.10B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$8.29B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$8.84B	USD	Annual
Operating income	`OperatingIncomeLoss`	$2.09B	USD	Annual
Operating income	`OperatingIncomeLoss`	$2.17B	USD	Annual
Operating income	`OperatingIncomeLoss`	$2.78B	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$8.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$11.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$6.00M	USD	Annual
Interest expense	`InterestExpense`	$334.00M	USD	Annual
Interest expense	`InterestExpense`	$322.00M	USD	Annual
Interest expense	`InterestExpense`	$307.00M	USD	Annual
Other income	`OtherNonoperatingIncomeExpense`	-	USD	Annual
Other income	`OtherNonoperatingIncomeExpense`	$152.00M	USD	Annual
Other income	`OtherNonoperatingIncomeExpense`	$13.00M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$2.47B	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$1.93B	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$1.87B	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$448.00M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$297.00M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$623.00M	USD	Annual
Net income	`ProfitLoss`	$2.02B	USD	Annual
Net income	`ProfitLoss`	$1.57B	USD	Annual
Net income	`ProfitLoss`	$1.31B	USD	Annual
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$49.00M	USD	Annual
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$41.00M	USD	Annual
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$53.00M	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.97B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.25B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.53B	USD	Annual
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$8.49	USD	Annual
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$6.42	USD	Annual
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$5.59	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$6.37	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$8.45	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$5.55	USD	Annual
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	224.70M	shares	Annual
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	231.90M	shares	Annual
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	238.60M	shares	Annual
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	226.10M	shares	Annual
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	240.60M	shares	Annual
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	233.10M	shares	Annual

Cash Flow Statement 135 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$2.02B	USD	Annual
Net income	`ProfitLoss`	$1.57B	USD	Annual
Net income	`ProfitLoss`	$1.31B	USD	Annual
Gain from sales of businesses and investments	`GainLossOnSaleOfBusiness`	$142.00M	USD	Annual
Gain from sales of businesses and investments	`GainLossOnSaleOfBusiness`	$25.00M	USD	Annual
Gain from sales of businesses and investments	`GainLossOnSaleOfBusiness`	$13.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$172.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$179.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$167.00M	USD	Annual
Amortization and impairment of intangible assets	`AdjustmentForAmortization`	$246.00M	USD	Annual
Amortization and impairment of intangible assets	`AdjustmentForAmortization`	$147.00M	USD	Annual
Amortization and impairment of intangible assets	`AdjustmentForAmortization`	$392.00M	USD	Annual
Share-based compensation expense	`ShareBasedCompensation`	$317.00M	USD	Annual
Share-based compensation expense	`ShareBasedCompensation`	$449.00M	USD	Annual
Share-based compensation expense	`ShareBasedCompensation`	$312.00M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$9.00M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$11.00M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-36.00M	USD	Annual
Receivables, net	`IncreaseDecreaseInReceivables`	$371.00M	USD	Annual
Receivables, net	`IncreaseDecreaseInReceivables`	$-108.00M	USD	Annual
Receivables, net	`IncreaseDecreaseInReceivables`	$119.00M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$186.00M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$264.00M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-28.00M	USD	Annual
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$-17.00M	USD	Annual
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$200.00M	USD	Annual
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$-20.00M	USD	Annual
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-156.00M	USD	Annual
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-119.00M	USD	Annual
Pension, other postretirement and postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-141.00M	USD	Annual
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-5.00M	USD	Annual
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$80.00M	USD	Annual
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-4.00M	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.34B	USD	2 Qtrs
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$2.78B	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.25B	USD	3 Qtrs
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$561.00M	USD	1 Quarter
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.83B	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$2.18B	USD	Annual
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$58.00M	USD	Annual
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$64.00M	USD	Annual
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$61.00M	USD	Annual
Payments for investments	`PaymentsToAcquireOtherInvestments`	$113.00M	USD	Annual
Payments for investments	`PaymentsToAcquireOtherInvestments`	$97.00M	USD	Annual
Payments for investments	`PaymentsToAcquireOtherInvestments`	$91.00M	USD	Annual
Net sales (purchases) of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$-15.00M	USD	Annual
Net sales (purchases) of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$167.00M	USD	Annual
Net sales (purchases) of short-term investments - non fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$-35.00M	USD	Annual
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$14.00M	USD	Annual
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$368.00M	USD	Annual
Acquisition of businesses, net of cash and funds held on behalf of clients	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$39.00M	USD	Annual
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$30.00M	USD	Annual
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$52.00M	USD	Annual
Sale of businesses, net of cash and funds held on behalf of clients	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$218.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$141.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$137.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$225.00M	USD	Annual
Cash provided by (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-27.00M	USD	2 Qtrs
Cash provided by (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-679.00M	USD	Annual
Cash provided by (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$102.00M	USD	1 Quarter
Cash provided by (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$49.00M	USD	Annual
Cash provided by (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-229.00M	USD	Annual
Cash provided by (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-116.00M	USD	3 Qtrs
Share repurchase	`PaymentsForRepurchaseOfEquity`	$1.96B	USD	Annual
Share repurchase	`PaymentsForRepurchaseOfEquity`	$3.54B	USD	Annual
Share repurchase	`PaymentsForRepurchaseOfEquity`	$1.76B	USD	Annual
Issuance of shares for employee benefit plans	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$149.00M	USD	Annual
Issuance of shares for employee benefit plans	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$131.00M	USD	Annual
Issuance of shares for employee benefit plans	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$130.00M	USD	Annual
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$5.97B	USD	Annual
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$4.15B	USD	Annual
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$6.05B	USD	Annual
Repayment of debt	`RepaymentsOfLongTermDebt`	$4.22B	USD	Annual
Repayment of debt	`RepaymentsOfLongTermDebt`	$4.94B	USD	Annual
Repayment of debt	`RepaymentsOfLongTermDebt`	$3.88B	USD	Annual
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$316.00M	USD	Annual
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$1.25B	USD	Annual
Increase in fiduciary liabilities, net of fiduciary receivables	`IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables`	$568.00M	USD	Annual
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$447.00M	USD	Annual
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$410.00M	USD	Annual
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$412.00M	USD	Annual
Noncontrolling interests and other financing activities	`PaymentsToMinorityShareholders`	$103.00M	USD	Annual
Noncontrolling interests and other financing activities	`PaymentsToMinorityShareholders`	$125.00M	USD	Annual
Noncontrolling interests and other financing activities	`PaymentsToMinorityShareholders`	$35.00M	USD	Annual
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-247.00M	USD	Annual
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-736.00M	USD	2 Qtrs
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-681.00M	USD	1 Quarter
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-1.92B	USD	Annual
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-594.00M	USD	3 Qtrs
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-1.77B	USD	Annual
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-235.00M	USD	Annual
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$29.00M	USD	2 Qtrs
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-93.00M	USD	3 Qtrs
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$297.00M	USD	Annual
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$63.00M	USD	Annual
Effect of exchange rates on cash and cash equivalents and funds held on behalf of clients	`EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$-34.00M	USD	1 Quarter
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$1.42B	USD	Annual
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$629.00M	USD	Annual
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-52.00M	USD	1 Quarter
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$448.00M	USD	3 Qtrs
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$611.00M	USD	2 Qtrs
Net increase in cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$72.00M	USD	Annual
Cash and cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.64B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$5.94B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.02B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$4.52B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.52B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.18B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at beginning of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.57B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.64B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$5.94B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.02B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$4.52B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.52B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.18B	USD	Point-in-time
Cash and cash equivalents and funds held on behalf of clients at end of year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.57B	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$544.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$884.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$790.00M	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$5.15B	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$5.69B	USD	Point-in-time
Funds held on behalf of clients	`FundsHeldForClients`	$6.10B	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`	$5.94B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.02B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$4.52B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.52B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$7.18B	USD	Point-in-time
Total cash and cash equivalents and funds held on behalf of clients	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations`	$6.57B	USD	Point-in-time
Interest paid	`InterestPaidNet`	$328.00M	USD	Annual
Interest paid	`InterestPaidNet`	$326.00M	USD	Annual
Interest paid	`InterestPaidNet`	$289.00M	USD	Annual
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$455.00M	USD	Annual
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$412.00M	USD	Annual
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$353.00M	USD	Annual

Stockholders Equity 44 line items

Line Item	Tag	Value	Unit	Period
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$1.78	USD	Annual
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$1.72	USD	Annual
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$1.99	USD	Annual
Beginning Balance (in shares)	`CommonStockSharesIssued`	225.50M	shares	Point-in-time
Beginning Balance (in shares)	`CommonStockSharesIssued`	214.80M	shares	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.58B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.16B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.45B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.22B	USD	Point-in-time
Net income	`ProfitLoss`	$2.02B	USD	Annual
Net income	`ProfitLoss`	$1.57B	USD	Annual
Net income	`ProfitLoss`	$1.31B	USD	Annual
Shares issued employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-130.00M	USD	Annual
Shares issued employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-154.00M	USD	Annual
Shares issued employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-131.00M	USD	Annual
Shares purchased	`StockRepurchasedDuringPeriodValue`	$1.96B	USD	Annual
Shares purchased	`StockRepurchasedDuringPeriodValue`	$1.76B	USD	Annual
Shares purchased	`StockRepurchasedDuringPeriodValue`	$3.54B	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$317.00M	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$449.00M	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$317.00M	USD	Annual
Dividends to shareholders	`DividendsCommonStockCash`	$412.00M	USD	Annual
Dividends to shareholders	`DividendsCommonStockCash`	$447.00M	USD	Annual
Dividends to shareholders	`DividendsCommonStockCash`	$410.00M	USD	Annual
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$3.00M	USD	Annual
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$13.00M	USD	Annual
Net change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$1.00M	USD	Annual
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$263.00M	USD	Annual
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$14.00M	USD	Annual
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-289.00M	USD	Annual
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-277.00M	USD	Annual
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$101.00M	USD	Annual
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$141.00M	USD	Annual
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$35.00M	USD	Annual
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$32.00M	USD	Annual
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$38.00M	USD	Annual
Net purchases of shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$13.00M	USD	Annual
Net purchases of shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$9.00M	USD	Annual
Ending Balance (in shares)	`CommonStockSharesIssued`	225.50M	shares	Point-in-time
Ending Balance (in shares)	`CommonStockSharesIssued`	214.80M	shares	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.58B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$1.16B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.45B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.22B	USD	Point-in-time

Comprehensive Income 30 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$2.02B	USD	Annual
Net income	`ProfitLoss`	$1.57B	USD	Annual
Net income	`ProfitLoss`	$1.31B	USD	Annual
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$49.00M	USD	Annual
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$41.00M	USD	Annual
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$53.00M	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.97B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.25B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLoss`	$1.53B	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$3.00M	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$13.00M	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$1.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$263.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$14.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-289.00M	USD	Annual
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-277.00M	USD	Annual
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$101.00M	USD	Annual
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$141.00M	USD	Annual
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-11.00M	USD	Annual
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$175.00M	USD	Annual
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-124.00M	USD	Annual
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$3.00M	USD	Annual
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-1.00M	USD	Annual
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	-	USD	Annual
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$172.00M	USD	Annual
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-10.00M	USD	Annual
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-124.00M	USD	Annual
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$1.25B	USD	Annual
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$1.41B	USD	Annual
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$2.14B	USD	Annual

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