$AON
Aon PLC Stock $aon

$aon Overview Financials Valuation SEC Filings Company Website

2024 Q2 Form 10-Q Financial Statement

#000162828024018649 Filed on April 26, 2024

Income Statement

Concept	2024 Q2	2024 Q1
Revenue	$3.760B	$4.070B
YoY Change	18.35%	5.14%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin	$2.799B	$2.426B
YoY Change	23.25%	3.9%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$45.00M	$44.00M
YoY Change	-29.69%	15.79%
% of Gross Profit
Operating Expenses	$2.972B	$2.486B
YoY Change	27.28%	3.67%
Operating Profit	$656.0M	$1.465B
YoY Change	-22.09%	-0.54%
Interest Expense	-$194.0M	$144.0M
YoY Change	55.2%	29.73%
% of Operating Profit	-29.57%	9.83%
Other Income/Expense, Net	$236.0M	$75.00M
YoY Change	-500.0%	-400.0%
Pretax Income	$698.0M	$1.424B
YoY Change	6.08%	6.11%
Income Tax	$160.0M	$331.0M
% Of Pretax Income	22.92%	23.24%
Net Earnings	$524.0M	$1.071B
YoY Change	-6.43%	2.0%
Net Earnings / Revenue	13.94%	26.31%
Basic Earnings Per Share	$2.47	$5.38
Diluted Earnings Per Share	$2.46	$5.35
COMMON SHARES
Basic Shares Outstanding	217.4M shares	198.3M shares
Diluted Shares Outstanding	213.3M shares	200.1M shares

Balance Sheet

Concept	2024 Q2	2024 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.156B	$13.53B
YoY Change	0.35%	947.64%
Cash & Equivalents	$974.0M	$995.0M
Short-Term Investments	$182.0M	$12.53B
Other Short-Term Assets	$1.063B	$1.020B
YoY Change	-94.41%	99.61%
Inventory
Prepaid Expenses	$176.0M	$128.0M
Receivables	$4.459B	$4.035B
Other Receivables	$0.00	$19.00M
Total Short-Term Assets	$25.54B	$28.62B
YoY Change	6.66%	29.26%
LONG-TERM ASSETS
Property, Plant & Equipment	$636.0M	$590.0M
YoY Change	-51.71%	-2.48%
Goodwill	$15.28B	$8.302B
YoY Change	82.79%	-0.2%
Intangibles
YoY Change
Long-Term Investments	$83.00M	$80.00M
YoY Change	84.44%	26.98%
Other Assets	$629.0M	$525.0M
YoY Change	-70.81%	3.55%
Total Long-Term Assets	$25.91B	$12.14B
YoY Change	114.13%	0.28%
TOTAL ASSETS
Total Short-Term Assets	$25.54B	$28.62B
Total Long-Term Assets	$25.91B	$12.14B
Total Assets	$51.45B	$40.77B
YoY Change	42.73%	19.02%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$2.319B	$1.925B
YoY Change	42.71%	14.52%
Accrued Expenses	$203.0M	$179.0M
YoY Change	10.33%	-1.65%
Deferred Revenue	$391.0M	$360.0M
YoY Change	10.14%	6.82%
Short-Term Debt	$0.00	$0.00
YoY Change	-100.0%	-100.0%
Long-Term Debt Due	$4.000M	$606.0M
YoY Change	-99.7%	-21.81%
Total Short-Term Liabilities	$23.50B	$21.84B
YoY Change	2.39%	6.04%
LONG-TERM LIABILITIES
Long-Term Debt	$17.61B	$15.92B
YoY Change	76.29%	50.48%
Other Long-Term Liabilities	$1.135B	$1.103B
YoY Change	-59.88%	3.76%
Total Long-Term Liabilities	$18.75B	$17.02B
YoY Change	46.24%	46.21%
TOTAL LIABILITIES
Total Short-Term Liabilities	$23.50B	$21.84B
Total Long-Term Liabilities	$18.75B	$17.02B
Total Liabilities	$45.30B	$40.80B
YoY Change	25.88%	19.3%
SHAREHOLDERS EQUITY
Retained Earnings	-$2.574B	-$2.700B
YoY Change	2.75%	13.07%
Common Stock	$12.91B	$6.971B
YoY Change	86.91%	1.59%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$5.860B	-$133.0M
YoY Change
Total Liabilities & Shareholders Equity	$51.45B	$40.77B
YoY Change	42.73%	19.02%

Cashflow Statement

Concept	2024 Q2	2024 Q1
OPERATING ACTIVITIES
Net Income	$524.0M	$1.071B
YoY Change	-6.43%	2.0%
Depreciation, Depletion And Amortization	$45.00M	$44.00M
YoY Change	-29.69%	15.79%
Cash From Operating Activities	$513.0M	$309.0M
YoY Change	-25.44%	-30.25%
INVESTING ACTIVITIES
Capital Expenditures	$53.00M	$48.00M
YoY Change	-23.19%	-36.84%
Acquisitions		$4.000M
YoY Change		100.0%
Other Investing Activities	$2.729B	-$4.913B
YoY Change	-34212.5%	-1848.4%
Cash From Investing Activities	$2.676B	-$4.961B
YoY Change	-3575.32%	-2520.0%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-2.997B	$5.261B
YoY Change	576.52%	1202.23%
NET CHANGE
Cash From Operating Activities	513.0M	$309.0M
Cash From Investing Activities	2.676B	-$4.961B
Cash From Financing Activities	-2.997B	$5.261B
Net Change In Cash	192.0M	$463.0M
YoY Change	14.29%	-58.29%
FREE CASH FLOW
Cash From Operating Activities	$513.0M	$309.0M
Capital Expenditures	$53.00M	$48.00M
Free Cash Flow	$460.0M	$261.0M
YoY Change	-25.69%	-28.88%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2024Q1	aon	Amortization And Impairment Of Intangible Assets AmortizationAndImpairmentOfIntangibleAssets	16000000	usd
CY2024Q1	aon	Other General Expenses OtherGeneralExpenses	348000000	usd
CY2023Q1	aon	Other General Expenses OtherGeneralExpenses	329000000	usd
CY2024Q1	us-gaap	Costs And Expenses CostsAndExpenses	2605000000	usd
CY2023Q1	us-gaap	Costs And Expenses CostsAndExpenses	2398000000	usd
CY2023Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	1473000000	usd
CY2023Q1	us-gaap	Profit Loss ProfitLoss	1079000000	usd
CY2023Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	29000000	usd
CY2023Q1	us-gaap	Restructuring Charges RestructuringCharges	0	usd
CY2024Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000315293
CY2024Q1	dei	Amendment Flag AmendmentFlag	false
CY2024Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2024
CY2024Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2024Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	L2
CY2024Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2024Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2024Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2024Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2024Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2024Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2024Q1	dei	Entity Shell Company EntityShellCompany	false
CY2024Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	217430759	shares
CY2023Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3871000000	usd
CY2024Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	124000000	usd
CY2024Q1	us-gaap	Occupancy Net OccupancyNet	71000000	usd
CY2023Q1	us-gaap	Occupancy Net OccupancyNet	75000000	usd
CY2024Q1	us-gaap	Depreciation Depreciation	44000000	usd
CY2023Q1	us-gaap	Depreciation Depreciation	38000000	usd
CY2023Q1	aon	Amortization And Impairment Of Intangible Assets AmortizationAndImpairmentOfIntangibleAssets	25000000	usd
CY2024Q1	us-gaap	Restructuring Charges RestructuringCharges	119000000	usd
CY2024Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	1465000000	usd
CY2024Q1	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	28000000	usd
CY2023Q1	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	5000000	usd
CY2024Q1	us-gaap	Interest Expense InterestExpense	144000000	usd
CY2023Q1	us-gaap	Interest Expense InterestExpense	111000000	usd
CY2024Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	75000000	usd
CY2023Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-25000000	usd
CY2024Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1424000000	usd
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1342000000	usd
CY2024Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	331000000	usd
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	263000000	usd
CY2024Q1	us-gaap	Profit Loss ProfitLoss	1093000000	usd
CY2023Q1	us-gaap	Profit Loss ProfitLoss	1079000000	usd
CY2024Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	22000000	usd
CY2023Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	29000000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	1071000000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	1050000000	usd
CY2024Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.38
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.09
CY2024Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.35
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.07
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	199100000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	206100000	shares
CY2024Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	200100000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	207100000	shares
CY2024Q1	us-gaap	Profit Loss ProfitLoss	1093000000	usd
CY2024Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	22000000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	1071000000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	1050000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	75000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	3000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-132000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	54000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-26000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-22000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-31000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	79000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	0	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	0	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-31000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	79000000	usd
CY2024Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1040000000	usd
CY2023Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1129000000	usd
CY2024Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	995000000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	778000000	usd
CY2024Q1	us-gaap	Short Term Investments ShortTermInvestments	5413000000	usd
CY2023Q4	us-gaap	Short Term Investments ShortTermInvestments	369000000	usd
CY2024Q1	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	4035000000	usd
CY2023Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	3254000000	usd
CY2024Q1	aon	Fiduciary Assets FiduciaryAssets	17161000000	usd
CY2023Q4	aon	Fiduciary Assets FiduciaryAssets	16307000000	usd
CY2024Q1	us-gaap	Other Assets Current OtherAssetsCurrent	1020000000	usd
CY2023Q4	us-gaap	Other Assets Current OtherAssetsCurrent	996000000	usd
CY2024Q1	us-gaap	Assets Current AssetsCurrent	28624000000	usd
CY2023Q4	us-gaap	Assets Current AssetsCurrent	21704000000	usd
CY2024Q1	us-gaap	Goodwill Goodwill	8302000000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	8414000000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	217000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	234000000	usd
CY2024Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	590000000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	638000000	usd
CY2024Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	628000000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	650000000	usd
CY2024Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	1254000000	usd
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	1195000000	usd
CY2024Q1	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	627000000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	618000000	usd
CY2024Q1	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	525000000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	506000000	usd
CY2024Q1	us-gaap	Assets Assets	40767000000	usd
CY2023Q4	us-gaap	Assets Assets	33959000000	usd
CY2024Q1	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	1925000000	usd
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CY2024Q1	us-gaap	Debt Current DebtCurrent	606000000	usd
CY2023Q4	us-gaap	Debt Current DebtCurrent	1204000000	usd
CY2024Q1	aon	Fiduciary Liabilities FiduciaryLiabilities	17161000000	usd
CY2023Q4	aon	Fiduciary Liabilities FiduciaryLiabilities	16307000000	usd
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CY2023Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1878000000	usd
CY2024Q1	us-gaap	Liabilities Current LiabilitiesCurrent	21838000000	usd
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	21651000000	usd
CY2024Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	15916000000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	9995000000	usd
CY2024Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	611000000	usd
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CY2024Q1	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	129000000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	115000000	usd
CY2024Q1	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	1198000000	usd
CY2023Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	1225000000	usd
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CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1074000000	usd
CY2024Q1	us-gaap	Liabilities Liabilities	40795000000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	34701000000	usd
CY2024Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2024Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000.0	shares
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CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	198600000	shares
CY2024Q1	us-gaap	Common Stock Value CommonStockValue	2000000	usd
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	2000000	usd
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CY2024Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-2700000000	usd
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CY2024Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4404000000	usd
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CY2024Q1	us-gaap	Stockholders Equity StockholdersEquity	-133000000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	-826000000	usd
CY2024Q1	us-gaap	Minority Interest MinorityInterest	105000000	usd
CY2023Q4	us-gaap	Minority Interest MinorityInterest	84000000	usd
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CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	33959000000	usd
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CY2024Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-132000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-26000000	usd
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CY2024Q1	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	1000000	usd
CY2024Q1	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1000000	usd
CY2024Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-28000000	usd
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CY2023Q1	us-gaap	Profit Loss ProfitLoss	1079000000	usd
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CY2023Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	127000000	usd
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.56
CY2023Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	115000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	3000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	54000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-22000000	usd
CY2023Q1	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1000000	usd
CY2023Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	58000000	usd
CY2023Q1	us-gaap	Profit Loss ProfitLoss	1079000000	usd
CY2024Q1	us-gaap	Depreciation Depreciation	44000000	usd
CY2023Q1	us-gaap	Depreciation Depreciation	38000000	usd
CY2024Q1	aon	Amortization And Impairment Of Intangible Assets AmortizationAndImpairmentOfIntangibleAssets	16000000	usd
CY2023Q1	aon	Amortization And Impairment Of Intangible Assets AmortizationAndImpairmentOfIntangibleAssets	25000000	usd
CY2024Q1	us-gaap	Share Based Compensation ShareBasedCompensation	130000000	usd
CY2023Q1	us-gaap	Share Based Compensation ShareBasedCompensation	127000000	usd
CY2024Q1	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-76000000	usd
CY2023Q1	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-70000000	usd
CY2024Q1	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	82000000	usd
CY2023Q1	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	0	usd
CY2024Q1	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	826000000	usd
CY2023Q1	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	664000000	usd
CY2024Q1	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-343000000	usd
CY2023Q1	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-443000000	usd
CY2024Q1	us-gaap	Increase Decrease In Restructuring Reserve IncreaseDecreaseInRestructuringReserve	34000000	usd
CY2023Q1	us-gaap	Increase Decrease In Restructuring Reserve IncreaseDecreaseInRestructuringReserve	0	usd
CY2024Q1	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	163000000	usd
CY2023Q1	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	126000000	usd
CY2024Q1	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-12000000	usd
CY2023Q1	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-9000000	usd
CY2024Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-168000000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-234000000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	309000000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	443000000	usd
CY2024Q1	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	118000000	usd
CY2023Q1	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	13000000	usd
CY2024Q1	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	56000000	usd
CY2023Q1	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	11000000	usd
CY2024Q1	aon	Payments For Proceeds From Marketable Securities PaymentsForProceedsFromMarketableSecurities	5046000000	usd
CY2023Q1	aon	Payments For Proceeds From Marketable Securities PaymentsForProceedsFromMarketableSecurities	-280000000	usd
CY2024Q1	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	4000000	usd
CY2023Q1	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2000000	usd
CY2024Q1	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	75000000	usd
CY2023Q1	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	1000000	usd
CY2024Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	48000000	usd
CY2023Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	76000000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-4961000000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	205000000	usd
CY2024Q1	us-gaap	Payments For Repurchase Of Equity PaymentsForRepurchaseOfEquity	250000000	usd
CY2023Q1	us-gaap	Payments For Repurchase Of Equity PaymentsForRepurchaseOfEquity	550000000	usd
CY2024Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	25000000	usd
CY2023Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	25000000	usd
CY2024Q1	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	130000000	usd
CY2023Q1	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	157000000	usd
CY2024Q1	us-gaap	Proceeds From Repayments Of Commercial Paper ProceedsFromRepaymentsOfCommercialPaper	-591000000	usd
CY2023Q1	us-gaap	Proceeds From Repayments Of Commercial Paper ProceedsFromRepaymentsOfCommercialPaper	-173000000	usd
CY2024Q1	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	5942000000	usd
CY2023Q1	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	744000000	usd
CY2024Q1	aon	Increase In Fiduciary Liabilities Net Of Fiduciary Receivables IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables	394000000	usd
CY2023Q1	aon	Increase In Fiduciary Liabilities Net Of Fiduciary Receivables IncreaseInFiduciaryLiabilitiesNetOfFiduciaryReceivables	636000000	usd
CY2024Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	123000000	usd
CY2023Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	115000000	usd
CY2024Q1	aon	Noncontrolling Interests And Other Financing Activities NoncontrollingInterestsAndOtherFinancingActivities	-6000000	usd
CY2023Q1	aon	Noncontrolling Interests And Other Financing Activities NoncontrollingInterestsAndOtherFinancingActivities	-6000000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	5261000000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	404000000	usd
CY2024Q1	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-146000000	usd
CY2023Q1	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	58000000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	463000000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1110000000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	7722000000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	7076000000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	8185000000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	8186000000	usd
CY2024Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	995000000	usd
CY2023Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1119000000	usd
CY2024Q1	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	73000000	usd
CY2023Q1	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	0	usd
CY2024Q1	us-gaap	Funds Held For Clients FundsHeldForClients	7117000000	usd
CY2023Q1	us-gaap	Funds Held For Clients FundsHeldForClients	7067000000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	8185000000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	8186000000	usd
CY2024Q1	us-gaap	Interest Paid Net InterestPaidNet	95000000	usd
CY2023Q1	us-gaap	Interest Paid Net InterestPaidNet	79000000	usd
CY2024Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	244000000	usd
CY2023Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	206000000	usd
CY2024Q1	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:8pt;margin-top:8pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="margin-bottom:8pt;margin-top:8pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of the accompanying Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the date of the Condensed Consolidated Financial Statements, and the reported amounts of reserves and expenses. These estimates and assumptions are based on management’s best estimates and judgments. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Management believes its estimates to be reasonable given the current facts available. Aon adjusts such estimates and assumptions when facts and circumstances dictate. Illiquid credit markets, volatile equity markets, and foreign currency exchange rate movements increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in estimates resulting from continuing changes in the economic environment would, if applicable, be reflected in the Condensed Consolidated Financial Statements in future periods.</span></div>
CY2024Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4070000000	usd
CY2023Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3871000000	usd
CY2024Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4070000000	usd
CY2023Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3871000000	usd
CY2024Q1	aon	Cash And Cash Equivalents And Short Term Investments CashAndCashEquivalentsAndShortTermInvestments	6400000000	usd
CY2023Q4	aon	Cash And Cash Equivalents And Short Term Investments CashAndCashEquivalentsAndShortTermInvestments	1100000000	usd
CY2024Q1	aon	Cash And Cash Equivalents And Short Term Investments Period Increase Decrease CashAndCashEquivalentsAndShortTermInvestmentsPeriodIncreaseDecrease	5300000000	usd
CY2024Q1	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	112000000	usd
CY2023Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	120000000	usd
CY2024Q1	aon	Short Term Investments Operating Funds Required To Be Held ShortTermInvestmentsOperatingFundsRequiredToBeHeld	55000000	gbp
CY2024Q1	aon	Short Term Investments Operating Funds Required To Be Held ShortTermInvestmentsOperatingFundsRequiredToBeHeld	70000000	usd
CY2023Q4	aon	Short Term Investments Operating Funds Required To Be Held ShortTermInvestmentsOperatingFundsRequiredToBeHeld	63000000	gbp
CY2023Q4	aon	Short Term Investments Operating Funds Required To Be Held ShortTermInvestmentsOperatingFundsRequiredToBeHeld	80000000	usd
CY2024Q1	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	4000000	usd
CY2023Q1	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-19000000	usd
CY2024Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	2000000	usd
CY2023Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	3000000	usd
CY2024Q1	us-gaap	Pension Expense PensionExpense	10000000	usd
CY2023Q1	us-gaap	Pension Expense PensionExpense	17000000	usd
CY2024Q1	aon	Gain Loss On Financial Instruments And Other GainLossOnFinancialInstrumentsAndOther	79000000	usd
CY2023Q1	aon	Gain Loss On Financial Instruments And Other GainLossOnFinancialInstrumentsAndOther	8000000	usd
CY2024Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	75000000	usd
CY2023Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-25000000	usd
CY2024Q1	aon	Deferred Consideration On Divestiture DeferredConsiderationOnDivestiture	82000000	usd
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	79000000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	76000000	usd
CY2024Q1	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	5000000	usd
CY2023Q1	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	7000000	usd
CY2024Q1	aon	Accounts Receivable Allowance For Credit Loss Write Off Net Of Recoveries AccountsReceivableAllowanceForCreditLossWriteOffNetOfRecoveries	2000000	usd
CY2023Q1	aon	Accounts Receivable Allowance For Credit Loss Write Off Net Of Recoveries AccountsReceivableAllowanceForCreditLossWriteOffNetOfRecoveries	0	usd
CY2024Q1	aon	Accounts Receivable Allowance For Credit Loss Foreign Currency Translation And Other AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther	-1000000	usd
CY2023Q1	aon	Accounts Receivable Allowance For Credit Loss Foreign Currency Translation And Other AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther	0	usd
CY2024Q1	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	81000000	usd
CY2023Q1	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	83000000	usd
CY2024Q1	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	446000000	usd
CY2023Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	354000000	usd
CY2024Q1	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	269000000	usd
CY2023Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	370000000	usd
CY2024Q1	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	128000000	usd
CY2023Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	100000000	usd
CY2024Q1	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	19000000	usd
CY2023Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	35000000	usd
CY2024Q1	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	158000000	usd
CY2023Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	137000000	usd
CY2024Q1	us-gaap	Other Assets Current OtherAssetsCurrent	1020000000	usd
CY2023Q4	us-gaap	Other Assets Current OtherAssetsCurrent	996000000	usd
CY2024Q1	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	194000000	usd
CY2023Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	195000000	usd
CY2024Q1	us-gaap	Income Taxes Receivable Noncurrent IncomeTaxesReceivableNoncurrent	98000000	usd
CY2023Q4	us-gaap	Income Taxes Receivable Noncurrent IncomeTaxesReceivableNoncurrent	100000000	usd
CY2024Q1	us-gaap	Long Term Investments LongTermInvestments	80000000	usd
CY2023Q4	us-gaap	Long Term Investments LongTermInvestments	45000000	usd
CY2024Q1	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	21000000	usd
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	26000000	usd
CY2024Q1	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	132000000	usd
CY2023Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	140000000	usd
CY2024Q1	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	525000000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	506000000	usd
CY2024Q1	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	397000000	usd
CY2023Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	291000000	usd
CY2024Q1	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	360000000	usd
CY2023Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	270000000	usd
CY2024Q1	aon	Operating Lease And Finance Lease Liability Current OperatingLeaseAndFinanceLeaseLiabilityCurrent	179000000	usd
CY2023Q4	aon	Operating Lease And Finance Lease Liability Current OperatingLeaseAndFinanceLeaseLiabilityCurrent	182000000	usd
CY2024Q1	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	129000000	usd
CY2023Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	69000000	usd
CY2024Q1	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	1081000000	usd
CY2023Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	1066000000	usd
CY2024Q1	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	2146000000	usd
CY2023Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1878000000	usd
CY2024Q1	aon	Contract With Customer Liability Including New Contract Revenue Recognized ContractWithCustomerLiabilityIncludingNewContractRevenueRecognized	179000000	usd
CY2023Q1	aon	Contract With Customer Liability Including New Contract Revenue Recognized ContractWithCustomerLiabilityIncludingNewContractRevenueRecognized	167000000	usd
CY2024Q1	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	866000000	usd
CY2023Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	827000000	usd
CY2024Q1	aon	Employee Related Liabilities Noncurrent EmployeeRelatedLiabilitiesNoncurrent	55000000	usd
CY2023Q4	aon	Employee Related Liabilities Noncurrent EmployeeRelatedLiabilitiesNoncurrent	59000000	usd
CY2024Q1	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	31000000	usd
CY2023Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	33000000	usd
CY2024Q1	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	5000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	10000000	usd
CY2024Q1	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	146000000	usd
CY2023Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	145000000	usd
CY2024Q1	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1103000000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1074000000	usd
CY2023Q4	us-gaap	Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Liability Noncurrent TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiabilityNoncurrent	72000000	usd
CY2024Q1	us-gaap	Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Liability Noncurrent TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiabilityNoncurrent	72000000	usd
CY2024Q1	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	0	acquisition
CY2023Q1	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	0	acquisition
CY2024Q1	aon	Number Of Dispositions NumberOfDispositions	1	disposition
CY2023Q1	aon	Number Of Dispositions NumberOfDispositions	0	disposition
CY2024Q1	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	usd
CY2023Q1	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	usd
CY2024Q1	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	446000000	usd
CY2024Q1	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	129000000	usd
CY2024Q1	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	446000000	usd
CY2024Q1	us-gaap	Disposal Group Including Discontinued Operation Intangible Assets Current DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsCurrent	156000000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	8414000000	usd
CY2024Q1	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-112000000	usd
CY2024Q1	us-gaap	Goodwill Goodwill	8302000000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	2224000000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2007000000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	217000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	2244000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2010000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	234000000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	52000000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	55000000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	34000000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	22000000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	17000000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	12000000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	25000000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	217000000	usd
CY2024Q1	aon	Number Of Credit Facilities NumberOfCreditFacilities	2	credit_facility
CY2024Q1	aon	Number Of Credit Facilities NumberOfCreditFacilities	2	credit_facility
CY2023Q4	us-gaap	Line Of Credit LineOfCredit	0	usd
CY2024Q1	us-gaap	Line Of Credit LineOfCredit	0	usd
CY2024Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.232
CY2023Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.196
CY2012Q2	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	5000000000	usd
CY2014Q4	aon	Stock Repurchase Program Authorized Amount Increase During Period StockRepurchaseProgramAuthorizedAmountIncreaseDuringPeriod	5000000000	usd
CY2020Q4	aon	Stock Repurchase Program Authorized Amount Increase During Period StockRepurchaseProgramAuthorizedAmountIncreaseDuringPeriod	5000000000	usd
CY2017Q2	aon	Stock Repurchase Program Authorized Amount Increase During Period StockRepurchaseProgramAuthorizedAmountIncreaseDuringPeriod	5000000000	usd
CY2022Q1	aon	Stock Repurchase Program Authorized Amount Increase During Period StockRepurchaseProgramAuthorizedAmountIncreaseDuringPeriod	7500000000	usd
CY2024Q1	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	27500000000	usd
CY2024Q1	us-gaap	Schedule Of Repurchase Agreements ScheduleOfRepurchaseAgreements	<div style="margin-bottom:3pt;margin-top:3pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The following table summarizes the Company’s share repurchase activity (in millions, except per share data):</span></div><div style="margin-top:3pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:73.607%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:11.180%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.530%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:11.183%"></td><td style="width:0.1%"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="9" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">Three Months Ended March 31,</span></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">2024</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">2023</span></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td></tr><tr><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Shares repurchased</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">0.8 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">1.8 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Average price per share</span></td><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">310.56 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">305.31 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td></tr><tr><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td></tr><tr><td colspan="3" style="background-color:#cceeff;border-bottom:1pt solid #000;padding:2px 1pt;text-align:left;vertical-align:bottom"><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Repurchase costs recorded to accumulated deficit</span></div></td><td style="background-color:#cceeff;border-bottom:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-bottom:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">250 </span></td><td style="background-color:#cceeff;border-bottom:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;border-bottom:1pt solid #000;padding:0 1pt"></td><td style="background-color:#cceeff;border-bottom:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-bottom:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">550 </span></td><td style="background-color:#cceeff;border-bottom:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td></tr><tr><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td></tr><tr><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td></tr></table></div>
CY2024Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	800000	shares
CY2023Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	1800000	shares
CY2024Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	310.56
CY2023Q1	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	305.31
CY2024Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	250000000	usd
CY2023Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	550000000	usd
CY2024Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	3100000000	usd
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	169900000	shares
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	24400000000	usd
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	199100000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	206100000	shares
CY2024Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000.0	shares
CY2023Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000.0	shares
CY2024Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	200100000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	207100000	shares
CY2024Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100000	shares
CY2023Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2024Q1	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-60000000	usd
CY2024Q1	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-39000000	usd
CY2024Q1	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-10000000	usd
CY2024Q1	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-29000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-31000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	53000000	usd
CY2023Q1	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	-37000000	usd
CY2023Q1	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-11000000	usd
CY2023Q1	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-26000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	79000000	usd
CY2024Q1	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	17000000	usd
CY2023Q1	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	23000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	97000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	0	usd
CY2024Q1	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	139000000	usd
CY2023Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	86000000	usd
CY2024Q1	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	110000000	usd
CY2023Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	194000000	usd
CY2024Q1	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2024Q1	aon	Number Of Revenue Lines NumberOfRevenueLines	4	revenue_line
CY2024Q1	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2024Q1	aon	Number Of Performance Metrics Measured NumberOfPerformanceMetricsMeasured	4	performance_metric
CY2024Q1	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2024Q1	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2024Q1	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2024Q1	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false

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2024 Q2 Form 10-Q Financial Statement

#000162828024018649 Filed on April 26, 2024

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2024 Q2 Form 10-Q Financial Statement

#000162828024018649 Filed on April 26, 2024

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