10-K Filing

AON PLC CIK: 315293 FY 2018

Filing Information

Form Type	10-K
Accession Number	`0001628280-19-001558`
Period End Date	20181231
Filing Date	20190219
Fiscal Year	2018
Fiscal Period	FY
XBRL Instance	aon-20181231.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 71 Income Statement 185 Cash Flow Statement 147 Stockholders Equity 56 Comprehensive Income 54

Balance Sheet 71 line items

Line Item	Tag	Value	Unit	Period
Ordinary shares, nominal or par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Ordinary shares, nominal or par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$0.01	USD	Point-in-time
Ordinary shares, Authorized shares	`CommonStockSharesAuthorized`	750.00M	shares	Point-in-time
Ordinary shares, Authorized shares	`CommonStockSharesAuthorized`	750.00M	shares	Point-in-time
Ordinary shares, issued shares	`CommonStockSharesIssued`	247.60M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$656.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$756.00M	USD	Point-in-time
Ordinary shares, issued shares	`CommonStockSharesIssued`	240.10M	shares	Point-in-time
Short-term investments	`ShortTermInvestments`	$529.00M	USD	Point-in-time
Short-term investments	`ShortTermInvestments`	$172.00M	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$2.48B	USD	Point-in-time
Receivables, net	`AccountsReceivableNetCurrent`	$2.76B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$10.17B	USD	Point-in-time
Fiduciary assets	`FiduciaryAssets`	$9.62B	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$618.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$289.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$14.37B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$13.68B	USD	Point-in-time
Goodwill	`Goodwill`	$7.41B	USD	Point-in-time
Goodwill	`Goodwill`	$8.17B	USD	Point-in-time
Goodwill	`Goodwill`	$8.36B	USD	Point-in-time
Intangible assets, net	`IntangibleAssetsNetExcludingGoodwill`	$1.15B	USD	Point-in-time
Intangible assets, net	`IntangibleAssetsNetExcludingGoodwill`	$1.73B	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$564.00M	USD	Point-in-time
Fixed assets, net	`PropertyPlantAndEquipmentNet`	$588.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$561.00M	USD	Point-in-time
Deferred tax assets	`DeferredIncomeTaxAssetsNet`	$389.00M	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$1.13B	USD	Point-in-time
Prepaid pension	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$1.06B	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$448.00M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$307.00M	USD	Point-in-time
Total assets	`Assets`	$26.09B	USD	Point-in-time
Total assets	`Assets`	$26.42B	USD	Point-in-time
Accounts payable and accrued liabilities	`FiduciaryLiabilities`	$1.94B	USD	Point-in-time
Accounts payable and accrued liabilities	`FiduciaryLiabilities`	$1.96B	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$299.00M	USD	Point-in-time
Short-term debt and current portion of long-term debt	`DebtCurrent`	$251.00M	USD	Point-in-time
Fiduciary liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$9.62B	USD	Point-in-time
Fiduciary liabilities	`AccountsPayableAndAccruedLiabilitiesCurrent`	$10.17B	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$870.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$936.00M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$13.30B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$12.76B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$5.99B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$5.67B	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$181.00M	USD	Point-in-time
Deferred tax liabilities	`DeferredIncomeTaxLiabilitiesNet`	$127.00M	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.79B	USD	Point-in-time
Pension, other postretirement, and postemployment liabilities	`PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent`	$1.64B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$1.10B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$1.10B	USD	Point-in-time
Total liabilities	`Liabilities`	$21.44B	USD	Point-in-time
Total liabilities	`Liabilities`	$22.20B	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 750 shares (issued: 2018 - 240.1; 2017 - 247.6)	`CommonStockValue`	$2.00M	USD	Point-in-time
Ordinary shares - $0.01 nominal value Authorized: 750 shares (issued: 2018 - 240.1; 2017 - 247.6)	`CommonStockValue`	$2.00M	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$5.78B	USD	Point-in-time
Additional paid-in capital	`AdditionalPaidInCapitalCommonStock`	$5.96B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$2.09B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$2.30B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-3.50B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-3.91B	USD	Point-in-time
Total Aon shareholders' equity	`StockholdersEquity`	$4.15B	USD	Point-in-time
Total Aon shareholders' equity	`StockholdersEquity`	$4.58B	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$68.00M	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$65.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.06B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.65B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.22B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.53B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$26.42B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$26.09B	USD	Point-in-time

Income Statement 185 line items

Line Item	Tag	Value	Unit	Period
Total revenue	`Revenues`	$3.09B	USD	1 Quarter
Total revenue	`Revenues`	$2.56B	USD	1 Quarter
Total revenue	`Revenues`	$2.37B	USD	1 Quarter
Total revenue	`Revenues`	$2.91B	USD	1 Quarter
Total revenue	`Revenues`	$2.38B	USD	1 Quarter
Total revenue	`Revenues`	$9.41B	USD	Annual
Total revenue	`Revenues`	$2.35B	USD	1 Quarter
Total revenue	`Revenues`	$10.77B	USD	Annual
Total revenue	`Revenues`	$10.00B	USD	Annual
Total revenue	`Revenues`	$2.34B	USD	1 Quarter
Total revenue	`Revenues`	$2.77B	USD	1 Quarter
Compensation and benefits	`LaborAndRelatedExpense`	$6.10B	USD	Annual
Compensation and benefits	`LaborAndRelatedExpense`	$6.00B	USD	Annual
Compensation and benefits	`LaborAndRelatedExpense`	$5.51B	USD	Annual
Information technology	`InformationTechnologyAndDataProcessing`	$484.00M	USD	Annual
Information technology	`InformationTechnologyAndDataProcessing`	$386.00M	USD	Annual
Information technology	`InformationTechnologyAndDataProcessing`	$419.00M	USD	Annual
Premises	`OccupancyNet`	$370.00M	USD	Annual
Premises	`OccupancyNet`	$348.00M	USD	Annual
Premises	`OccupancyNet`	$343.00M	USD	Annual
Depreciation of fixed assets	`DepreciationDepletionAndAmortization`	$187.00M	USD	Annual
Depreciation of fixed assets	`DepreciationDepletionAndAmortization`	$162.00M	USD	Annual
Depreciation of fixed assets	`DepreciationDepletionAndAmortization`	$176.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationOfIntangibleAssets`	$157.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationOfIntangibleAssets`	$593.00M	USD	Annual
Amortization and impairment of intangible assets	`AmortizationOfIntangibleAssets`	$704.00M	USD	Annual
Other general expenses	`OtherGeneralExpenses`	$1.27B	USD	Annual
Other general expenses	`OtherGeneralExpenses`	$1.04B	USD	Annual
Other general expenses	`OtherGeneralExpenses`	$1.50B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$9.23B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$8.93B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$7.60B	USD	Annual
Operating income	`OperatingIncomeLoss`	$799.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$-127.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$499.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$256.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$1.81B	USD	Annual
Operating income	`OperatingIncomeLoss`	$1.54B	USD	Annual
Operating income	`OperatingIncomeLoss`	$335.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$262.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$1.06B	USD	Annual
Operating income	`OperatingIncomeLoss`	$-16.00M	USD	1 Quarter
Operating income	`OperatingIncomeLoss`	$601.00M	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	$9.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$27.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$5.00M	USD	Annual
Interest expense	`InterestExpense`	$278.00M	USD	Annual
Interest expense	`InterestExpense`	$282.00M	USD	Annual
Interest expense	`InterestExpense`	$282.00M	USD	Annual
Other income (expense)	`NonoperatingIncomeExpense`	$-125.00M	USD	Annual
Other income (expense)	`NonoperatingIncomeExpense`	$-137.00M	USD	Annual
Other income (expense)	`NonoperatingIncomeExpense`	$-25.00M	USD	Annual
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$1.25B	USD	Annual
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$1.40B	USD	Annual
Income from continuing operations before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments`	$685.00M	USD	Annual
Income taxes	`IncomeTaxExpenseBenefit`	$250.00M	USD	Annual
Income taxes	`IncomeTaxExpenseBenefit`	$146.00M	USD	Annual
Income taxes	`IncomeTaxExpenseBenefit`	$148.00M	USD	Annual
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$155.00M	USD	1 Quarter
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$1.25B	USD	Annual
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$196.00M	USD	1 Quarter
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$57.00M	USD	1 Quarter
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$-43.00M	USD	1 Quarter
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$265.00M	USD	1 Quarter
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$604.00M	USD	1 Quarter
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$435.00M	USD	Annual
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$17.00M	USD	1 Quarter
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$1.10B	USD	Annual
Net income from continuing operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$284.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$74.00M	USD	Annual
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$69.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$40.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$821.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-29.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-4.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$1.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$828.00M	USD	Annual
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$6.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-2.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$177.00M	USD	Annual
Net income	`ProfitLoss`	$1.17B	USD	Annual
Net income	`ProfitLoss`	$1.43B	USD	Annual
Net income	`ProfitLoss`	$778.00M	USD	1 Quarter
Net income	`ProfitLoss`	$305.00M	USD	1 Quarter
Net income	`ProfitLoss`	$610.00M	USD	1 Quarter
Net income	`ProfitLoss`	$192.00M	USD	1 Quarter
Net income	`ProfitLoss`	$-12.00M	USD	1 Quarter
Net income	`ProfitLoss`	$58.00M	USD	1 Quarter
Net income	`ProfitLoss`	$153.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.26B	USD	Annual
Net income	`ProfitLoss`	$353.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$37.00M	USD	Annual
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$40.00M	USD	Annual
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$34.00M	USD	Annual
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$9.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$8.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$16.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$6.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$10.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$7.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$14.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$7.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$147.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$345.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$594.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$185.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$-19.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.13B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.40B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$769.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$291.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.23B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$48.00M	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.04	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$1.14	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.74	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$2.37	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$1.54	USD	Annual
Basic net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$4.32	USD	Annual
Basic net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.95	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.61	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$-0.20	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$0.19	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$4.55	USD	Annual
Basic net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$-0.12	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$0.15	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$0.02	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$0.01	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$0.30	USD	Annual
Basic net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$3.13	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$0.66	USD	Annual
Basic net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$3.20	USD	Annual
Basic net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$-0.02	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$0.28	USD	1 Quarter
Basic net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare`	$-0.01	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$4.62	USD	Annual
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$2.93	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$-0.08	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$0.60	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$2.39	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$1.10	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$1.42	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$5.21	USD	Annual
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$4.74	USD	Annual
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$0.72	USD	1 Quarter
Basic net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareBasic`	$0.20	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$4.29	USD	Annual
Diluted net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$4.51	USD	Annual
Diluted net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.61	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$2.35	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$1.13	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.73	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.19	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.04	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$0.94	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$-0.20	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, continuing operations (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$1.53	USD	Annual
Diluted net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$0.15	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$0.65	USD	Annual
Diluted net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$-0.11	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	-	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$3.13	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$0.02	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$-0.01	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$0.28	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$-0.01	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$0.30	USD	Annual
Diluted net income per share attributable to Aon shareholders, discontinued operations (in dollars per share)	`IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare`	$3.17	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$5.16	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$1.09	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$4.59	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$0.72	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$2.93	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$0.60	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$1.41	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$4.70	USD	Annual
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$2.37	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$-0.07	USD	1 Quarter
Diluted net income per share attributable to Aon shareholders (in dollars per share)	`EarningsPerShareDiluted`	$0.19	USD	1 Quarter
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	245.20M	shares	Annual
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	268.10M	shares	Annual
Weighted average ordinary shares outstanding - basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	258.50M	shares	Annual
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	260.70M	shares	Annual
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	270.30M	shares	Annual
Weighted average ordinary shares outstanding - diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	247.00M	shares	Annual

Cash Flow Statement 147 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$1.17B	USD	Annual
Net income	`ProfitLoss`	$1.43B	USD	Annual
Net income	`ProfitLoss`	$778.00M	USD	1 Quarter
Net income	`ProfitLoss`	$305.00M	USD	1 Quarter
Net income	`ProfitLoss`	$610.00M	USD	1 Quarter
Net income	`ProfitLoss`	$192.00M	USD	1 Quarter
Net income	`ProfitLoss`	$-12.00M	USD	1 Quarter
Net income	`ProfitLoss`	$58.00M	USD	1 Quarter
Net income	`ProfitLoss`	$153.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.26B	USD	Annual
Net income	`ProfitLoss`	$353.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$74.00M	USD	Annual
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$69.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$40.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$821.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-29.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-4.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$1.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$828.00M	USD	Annual
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$6.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$-2.00M	USD	1 Quarter
Net income from discontinued operations	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$177.00M	USD	Annual
Loss (gain) from sales of businesses and investments, net	`GainonSaleofBusinessandInvestmentsNet`	$-16.00M	USD	Annual
Loss (gain) from sales of businesses and investments, net	`GainonSaleofBusinessandInvestmentsNet`	$39.00M	USD	Annual
Loss (gain) from sales of businesses and investments, net	`GainonSaleofBusinessandInvestmentsNet`	$-6.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$162.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$176.00M	USD	Annual
Depreciation of fixed assets	`Depreciation`	$187.00M	USD	Annual
Amortization and impairment of intangible assets	`AdjustmentForAmortization`	$593.00M	USD	Annual
Amortization and impairment of intangible assets	`AdjustmentForAmortization`	$157.00M	USD	Annual
Amortization and impairment of intangible assets	`AdjustmentForAmortization`	$704.00M	USD	Annual
Share-based compensation expense	`ShareBasedCompensation`	$319.00M	USD	Annual
Share-based compensation expense	`ShareBasedCompensation`	$306.00M	USD	Annual
Share-based compensation expense	`ShareBasedCompensation`	$338.00M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-18.00M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-24.00M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$-225.00M	USD	Annual
Fiduciary receivables	`IncreaseDecreaseInFiduciaryReceivables`	$679.00M	USD	Annual
Fiduciary receivables	`IncreaseDecreaseInFiduciaryReceivables`	$-171.00M	USD	Annual
Fiduciary receivables	`IncreaseDecreaseInFiduciaryReceivables`	$-595.00M	USD	Annual
Short-term investments funds held on behalf of clients	`IncreaseDecreaseInClientFundsHeld`	$135.00M	USD	Annual
Short-term investments funds held on behalf of clients	`IncreaseDecreaseInClientFundsHeld`	$540.00M	USD	Annual
Short-term investments funds held on behalf of clients	`IncreaseDecreaseInClientFundsHeld`	$320.00M	USD	Annual
Fiduciary liabilities	`IncreaseDecreaseInFiduciaryLiabilities`	$-55.00M	USD	Annual
Fiduciary liabilities	`IncreaseDecreaseInFiduciaryLiabilities`	$-36.00M	USD	Annual
Fiduciary liabilities	`IncreaseDecreaseInFiduciaryLiabilities`	$999.00M	USD	Annual
Receivables, net	`IncreaseDecreaseInReceivables`	$105.00M	USD	Annual
Receivables, net	`IncreaseDecreaseInReceivables`	$254.00M	USD	Annual
Receivables, net	`IncreaseDecreaseInReceivables`	$127.00M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$25.00M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$53.00M	USD	Annual
Accounts payable and accrued liabilities	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$96.00M	USD	Annual
Restructuring reserves	`IncreaseDecreaseInRestructuringReserve`	-	USD	Annual
Restructuring reserves	`IncreaseDecreaseInRestructuringReserve`	$23.00M	USD	Annual
Restructuring reserves	`IncreaseDecreaseInRestructuringReserve`	$172.00M	USD	Annual
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$-42.00M	USD	Annual
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$-914.00M	USD	Annual
Current income taxes	`IncreaseDecreaseInAccruedIncomeTaxesPayable`	$34.00M	USD	Annual
Pension, other postretirement and other postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-66.00M	USD	Annual
Pension, other postretirement and other postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$42.00M	USD	Annual
Pension, other postretirement and other postemployment liabilities	`IncreaseDecreaseInPensionAndPostretirementObligations`	$-259.00M	USD	Annual
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$8.00M	USD	Annual
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-66.00M	USD	Annual
Other assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-2.00M	USD	Annual
Cash provided by operating activities - continuing operations	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$669.00M	USD	Annual
Cash provided by operating activities - continuing operations	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$1.69B	USD	Annual
Cash provided by operating activities - continuing operations	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$1.83B	USD	Annual
Cash provided by operating activities - discontinued operations	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$497.00M	USD	Annual
Cash provided by operating activities - discontinued operations	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$65.00M	USD	Annual
Cash provided by operating activities - discontinued operations	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	-	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$2.33B	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.69B	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$734.00M	USD	Annual
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$71.00M	USD	Annual
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$43.00M	USD	Annual
Proceeds from investments	`ProceedsFromSaleAndMaturityOfOtherInvestments`	$68.00M	USD	Annual
Payments for investments	`PaymentsToAcquireOtherInvestments`	$80.00M	USD	Annual
Payments for investments	`PaymentsToAcquireOtherInvestments`	$64.00M	USD	Annual
Payments for investments	`PaymentsToAcquireOtherInvestments`	$64.00M	USD	Annual
Net sales (purchases) of short-term investments non-fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$-61.00M	USD	Annual
Net sales (purchases) of short-term investments non-fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$232.00M	USD	Annual
Net sales (purchases) of short-term investments non-fiduciary	`PaymentsForProceedsFromMarketableSecurities`	$-348.00M	USD	Annual
Acquisition of businesses, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$879.00M	USD	Annual
Acquisition of businesses, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$58.00M	USD	Annual
Acquisition of businesses, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$1.03B	USD	Annual
Sale of businesses, net of cash sold	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$-10.00M	USD	Annual
Sale of businesses, net of cash sold	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$107.00M	USD	Annual
Sale of businesses, net of cash sold	`ProceedsFromDivestitureOfBusinessesNetOfCashDivested`	$4.25B	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$183.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$240.00M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$156.00M	USD	Annual
Cash provided by (used for) investing activities - continuing operations	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$-888.00M	USD	Annual
Cash provided by (used for) investing activities - continuing operations	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$31.00M	USD	Annual
Cash provided by (used for) investing activities - continuing operations	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$2.81B	USD	Annual
Cash used for investing activities - discontinued operations	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-66.00M	USD	Annual
Cash used for investing activities - discontinued operations	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-19.00M	USD	Annual
Cash used for investing activities - discontinued operations	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	-	USD	Annual
Cash provided by (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$31.00M	USD	Annual
Cash provided by (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$2.79B	USD	Annual
Cash provided by (used for) investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-954.00M	USD	Annual
Share repurchase	`PaymentsForRepurchaseOfEquity`	$2.40B	USD	Annual
Share repurchase	`PaymentsForRepurchaseOfEquity`	$1.26B	USD	Annual
Share repurchase	`PaymentsForRepurchaseOfEquity`	$1.47B	USD	Annual
Issuance of shares for employee benefit plans	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$121.00M	USD	Annual
Issuance of shares for employee benefit plans	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$129.00M	USD	Annual
Issuance of shares for employee benefit plans	`PaymentsRelatedToTaxWithholdingForShareBasedCompensation`	$149.00M	USD	Annual
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$3.47B	USD	Annual
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$1.65B	USD	Annual
Issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$5.75B	USD	Annual
Repayment of debt	`RepaymentsOfLongTermDebt`	$5.42B	USD	Annual
Repayment of debt	`RepaymentsOfLongTermDebt`	$2.94B	USD	Annual
Repayment of debt	`RepaymentsOfLongTermDebt`	$2.00B	USD	Annual
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$382.00M	USD	Annual
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$345.00M	USD	Annual
Cash dividends to shareholders	`PaymentsOfDividendsCommonStock`	$364.00M	USD	Annual
Noncontrolling interests and other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-77.00M	USD	Annual
Noncontrolling interests and other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-36.00M	USD	Annual
Noncontrolling interests and other financing activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-35.00M	USD	Annual
Cash used for financing activities - continuing operations	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$-1.29B	USD	Annual
Cash used for financing activities - continuing operations	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$-3.27B	USD	Annual
Cash used for financing activities - continuing operations	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$-1.70B	USD	Annual
Cash used for financing activities - discontinued operations	`CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations`	-	USD	Annual
Cash used for financing activities - discontinued operations	`CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations`	-	USD	Annual
Cash used for financing activities - discontinued operations	`CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations`	-	USD	Annual
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-1.29B	USD	Annual
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-3.27B	USD	Annual
Cash used for financing activities	`NetCashProvidedByUsedInFinancingActivities`	$-1.70B	USD	Annual
Effect of exchange rates on cash and cash equivalents	`EffectOfExchangeRateOnCashAndCashEquivalents`	$-118.00M	USD	Annual
Effect of exchange rates on cash and cash equivalents	`EffectOfExchangeRateOnCashAndCashEquivalents`	$69.00M	USD	Annual
Effect of exchange rates on cash and cash equivalents	`EffectOfExchangeRateOnCashAndCashEquivalents`	$-39.00M	USD	Annual
Net increase (decrease) in cash and cash equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$325.00M	USD	Annual
Net increase (decrease) in cash and cash equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$-100.00M	USD	Annual
Net increase (decrease) in cash and cash equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$47.00M	USD	Annual
Cash and cash equivalents at beginning of period	`CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations`	$756.00M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations`	$384.00M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations`	$656.00M	USD	Point-in-time
Cash and cash equivalents at beginning of period	`CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations`	$431.00M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations`	$756.00M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations`	$384.00M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations`	$656.00M	USD	Point-in-time
Cash and cash equivalents at end of period	`CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations`	$431.00M	USD	Point-in-time
Interest paid	`InterestPaidNet`	$272.00M	USD	Annual
Interest paid	`InterestPaidNet`	$272.00M	USD	Annual
Interest paid	`InterestPaidNet`	$266.00M	USD	Annual
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$1.18B	USD	Annual
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$337.00M	USD	Annual
Income taxes paid, net of refunds	`IncomeTaxesPaidNet`	$218.00M	USD	Annual

Stockholders Equity 56 line items

Line Item	Tag	Value	Unit	Period
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$1.29	USD	Annual
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$1.41	USD	Annual
Dividends (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$1.56	USD	Annual
Beginning Balance (in shares)	`CommonStockSharesIssued`	247.60M	shares	Point-in-time
Beginning Balance (in shares)	`CommonStockSharesIssued`	240.10M	shares	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.06B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.65B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.22B	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.53B	USD	Point-in-time
Net income	`ProfitLoss`	$1.17B	USD	Annual
Net income	`ProfitLoss`	$1.43B	USD	Annual
Net income	`ProfitLoss`	$778.00M	USD	1 Quarter
Net income	`ProfitLoss`	$305.00M	USD	1 Quarter
Net income	`ProfitLoss`	$610.00M	USD	1 Quarter
Net income	`ProfitLoss`	$192.00M	USD	1 Quarter
Net income	`ProfitLoss`	$-12.00M	USD	1 Quarter
Net income	`ProfitLoss`	$58.00M	USD	1 Quarter
Net income	`ProfitLoss`	$153.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.26B	USD	Annual
Net income	`ProfitLoss`	$353.00M	USD	1 Quarter
Shares issued employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-121.00M	USD	Annual
Shares issued employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-125.00M	USD	Annual
Shares issued employee stock compensation plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$-148.00M	USD	Annual
Shares purchased (in shares)	`TreasuryStockSharesAcquired`	118.30M	shares	27 Qtrs
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$1.26B	USD	Annual
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$2.42B	USD	Annual
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$1.45B	USD	Annual
Shares purchased	`TreasuryStockValueAcquiredCostMethod`	$11.00B	USD	27 Qtrs
Tax benefit employee benefit plans	`AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet`	$-4.00M	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$321.00M	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$338.00M	USD	Annual
Share-based compensation expense	`AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue`	$331.00M	USD	Annual
Dividends to shareholders ($1.56 per share)	`DividendsCommonStockCash`	$345.00M	USD	Annual
Dividends to shareholders ($1.56 per share)	`DividendsCommonStockCash`	$364.00M	USD	Annual
Dividends to shareholders ($1.56 per share)	`DividendsCommonStockCash`	$382.00M	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$11.00M	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-12.00M	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$12.00M	USD	Annual
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$390.00M	USD	Annual
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-444.00M	USD	Annual
Net foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-495.00M	USD	Annual
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-16.00M	USD	Annual
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-17.00M	USD	Annual
Net postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-19.00M	USD	Annual
Net purchases of shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$11.00M	USD	Annual
Net purchases of shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$1.00M	USD	Annual
Net purchases of shares from noncontrolling interests	`MinorityInterestDecreaseFromRedemptions`	$38.00M	USD	Annual
Dividends paid to noncontrolling interests on subsidiary common stock	`MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders`	$28.00M	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`	$27.00M	USD	Annual
Ending Balance (in shares)	`CommonStockSharesIssued`	247.60M	shares	Point-in-time
Ending Balance (in shares)	`CommonStockSharesIssued`	240.10M	shares	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.06B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.65B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.22B	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.53B	USD	Point-in-time

Comprehensive Income 54 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$1.17B	USD	Annual
Net income	`ProfitLoss`	$1.43B	USD	Annual
Net income	`ProfitLoss`	$778.00M	USD	1 Quarter
Net income	`ProfitLoss`	$305.00M	USD	1 Quarter
Net income	`ProfitLoss`	$610.00M	USD	1 Quarter
Net income	`ProfitLoss`	$192.00M	USD	1 Quarter
Net income	`ProfitLoss`	$-12.00M	USD	1 Quarter
Net income	`ProfitLoss`	$58.00M	USD	1 Quarter
Net income	`ProfitLoss`	$153.00M	USD	1 Quarter
Net income	`ProfitLoss`	$1.26B	USD	Annual
Net income	`ProfitLoss`	$353.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$37.00M	USD	Annual
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$40.00M	USD	Annual
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$34.00M	USD	Annual
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$9.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$8.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$16.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$6.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$10.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$7.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$14.00M	USD	1 Quarter
Less: Net income attributable to noncontrolling interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$7.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$147.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$345.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$594.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$185.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$-19.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.13B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.40B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$769.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$291.00M	USD	1 Quarter
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.23B	USD	Annual
Net income attributable to Aon shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$48.00M	USD	1 Quarter
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$11.00M	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-12.00M	USD	Annual
Change in fair value of financial instruments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$12.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$390.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-444.00M	USD	Annual
Foreign currency translation adjustments	`OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax`	$-495.00M	USD	Annual
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-16.00M	USD	Annual
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-17.00M	USD	Annual
Postretirement benefit obligation	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-19.00M	USD	Annual
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$421.00M	USD	Annual
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-416.00M	USD	Annual
Total other comprehensive income (loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-491.00M	USD	Annual
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-2.00M	USD	Annual
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$-4.00M	USD	Annual
Less: Other comprehensive income (loss) attributable to noncontrolling interests	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest`	$5.00M	USD	Annual
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$416.00M	USD	Annual
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-412.00M	USD	Annual
Total other comprehensive income (loss) attributable to Aon shareholders	`OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent`	$-489.00M	USD	Annual
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$722.00M	USD	Annual
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$1.64B	USD	Annual
Comprehensive income attributable to Aon shareholders	`ComprehensiveIncomeNetOfTax`	$907.00M	USD	Annual

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