$AON
Aon PLC Stock $aon

$aon Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000162828024005392 Filed on February 16, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$4.070B	$3.375B	$13.38B
YoY Change	5.14%	7.83%	7.19%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin	$2.426B	$2.400B	$9.200B
YoY Change	3.9%	16.73%	7.65%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$44.00M	$67.00M	$256.0M
YoY Change	15.79%	8.06%	-3.03%
% of Gross Profit
Operating Expenses	$2.486B	$2.467B	$9.456B
YoY Change	3.67%	16.48%	7.33%
Operating Profit	$1.465B		$3.785B
YoY Change	-0.54%		3.16%
Interest Expense	$144.0M	-$112.0M	-$453.0M
YoY Change	29.73%	4.67%	16.75%
% of Operating Profit	9.83%		-11.97%
Other Income/Expense, Net	$75.00M	-$58.00M	-$163.0M
YoY Change	-400.0%	-70.41%	30.4%
Pretax Income	$1.424B	$609.0M	$3.169B
YoY Change	6.11%	-14.1%	0.41%
Income Tax	$331.0M	$102.0M	$541.0M
% Of Pretax Income	23.24%	16.75%	17.07%
Net Earnings	$1.071B	$498.0M	$2.564B
YoY Change	2.0%	-24.2%	-0.97%
Net Earnings / Revenue	26.31%	14.76%	19.17%
Basic Earnings Per Share	$5.38		$12.60
Diluted Earnings Per Share	$5.35	$2.47	$12.51
COMMON SHARES
Basic Shares Outstanding	198.3M shares	200.2M shares	203.5M shares
Diluted Shares Outstanding	200.1M shares		205.0M shares

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$13.53B	$1.147B	$1.147B
YoY Change	947.64%	0.44%	0.44%
Cash & Equivalents	$995.0M	$778.0M	$778.0M
Short-Term Investments	$12.53B	$369.0M	$369.0M
Other Short-Term Assets	$1.020B	$17.27B	$17.27B
YoY Change	99.61%	4.4%	4.4%
Inventory
Prepaid Expenses	$128.0M	$100.0M
Receivables	$4.035B	$3.254B	$3.254B
Other Receivables	$19.00M	$0.00	$0.00
Total Short-Term Assets	$28.62B	$21.68B	$21.68B
YoY Change	29.26%	4.59%	4.59%
LONG-TERM ASSETS
Property, Plant & Equipment	$590.0M	$1.288B	$1.288B
YoY Change	-2.48%	2.47%	2.47%
Goodwill	$8.302B	$8.414B
YoY Change	-0.2%	1.47%
Intangibles
YoY Change
Long-Term Investments	$80.00M	$45.00M	$45.00M
YoY Change	26.98%	-25.0%	-25.0%
Other Assets	$525.0M	$2.319B	$2.319B
YoY Change	3.55%	16.83%	16.83%
Total Long-Term Assets	$12.14B	$12.26B	$12.26B
YoY Change	0.28%	2.29%	2.29%
TOTAL ASSETS
Total Short-Term Assets	$28.62B	$21.68B	$21.68B
Total Long-Term Assets	$12.14B	$12.26B	$12.26B
Total Assets	$40.77B	$33.93B	$33.93B
YoY Change	19.02%	3.75%	3.75%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.925B	$2.262B	$2.262B
YoY Change	14.52%	7.0%	7.0%
Accrued Expenses	$179.0M	$159.0M	$159.0M
YoY Change	-1.65%	-14.52%	-14.52%
Deferred Revenue	$360.0M	$270.0M
YoY Change	6.82%	8.0%
Short-Term Debt	$0.00	$597.0M	$597.0M
YoY Change	-100.0%	0.84%	0.84%
Long-Term Debt Due	$606.0M	$1.204B	$1.204B
YoY Change	-21.81%	27.41%	27.41%
Total Short-Term Liabilities	$21.84B	$21.62B	$21.62B
YoY Change	6.04%	6.48%	6.48%
LONG-TERM LIABILITIES
Long-Term Debt	$15.92B	$9.995B	$9.995B
YoY Change	50.48%	1.73%	1.73%
Other Long-Term Liabilities	$1.103B	$2.940B	$2.940B
YoY Change	3.76%	1.27%	1.27%
Total Long-Term Liabilities	$17.02B	$12.94B	$12.94B
YoY Change	46.21%	1.63%	1.63%
TOTAL LIABILITIES
Total Short-Term Liabilities	$21.84B	$21.62B	$21.62B
Total Long-Term Liabilities	$17.02B	$12.94B	$12.94B
Total Liabilities	$40.80B	$34.76B	$34.76B
YoY Change	19.3%	4.58%	4.58%
SHAREHOLDERS EQUITY
Retained Earnings	-$2.700B	-$3.399B
YoY Change	13.07%	22.62%
Common Stock	$6.971B	$6.946B
YoY Change	1.59%	1.17%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	-$133.0M	-$826.0M	-$826.0M
YoY Change
Total Liabilities & Shareholders Equity	$40.77B	$33.93B	$33.93B
YoY Change	19.02%	3.75%	3.75%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$1.071B	$498.0M	$2.564B
YoY Change	2.0%	-24.2%	-0.97%
Depreciation, Depletion And Amortization	$44.00M	$67.00M	$256.0M
YoY Change	15.79%	8.06%	-3.03%
Cash From Operating Activities	$309.0M	$1.261B	$3.435B
YoY Change	-30.25%	21.02%	6.71%
INVESTING ACTIVITIES
Capital Expenditures	$48.00M	$49.00M	$252.0M
YoY Change	-36.84%	-170.0%	-228.57%
Acquisitions	$4.000M		$35.00M
YoY Change	100.0%		-78.4%
Other Investing Activities	-$4.913B	-$191.0M	$64.00M
YoY Change	-1848.4%	12.35%	-125.3%
Cash From Investing Activities	-$4.961B	-$240.0M	-$188.0M
YoY Change	-2520.0%	0.0%	-58.13%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			-$2.869B
YoY Change			-14.61%
Debt Paid & Issued, Net			$350.0M
YoY Change			-30.0%
Cash From Financing Activities	$5.261B	-1.664B	-2.865B
YoY Change	1202.23%	14.68%	60.06%
NET CHANGE
Cash From Operating Activities	$309.0M	1.261B	3.435B
Cash From Investing Activities	-$4.961B	-240.0M	-188.0M
Cash From Financing Activities	$5.261B	-1.664B	-2.865B
Net Change In Cash	$463.0M	-643.0M	382.0M
YoY Change	-58.29%	-0.92%	-61.02%
FREE CASH FLOW
Cash From Operating Activities	$309.0M	$1.261B	$3.435B
Capital Expenditures	$48.00M	$49.00M	$252.0M
Free Cash Flow	$261.0M	$1.212B	$3.183B
YoY Change	-28.88%	8.99%	-6.79%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2023	us-gaap	Occupancy Net OccupancyNet	294000000	usd
CY2022	us-gaap	Occupancy Net OccupancyNet	289000000	usd
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CY2022	us-gaap	Depreciation Depreciation	151000000	usd
CY2021	us-gaap	Depreciation Depreciation	179000000	usd
CY2023	aon	Amortization And Impairment Of Intangible Assets AmortizationAndImpairmentOfIntangibleAssets	89000000	usd
CY2022	aon	Amortization And Impairment Of Intangible Assets AmortizationAndImpairmentOfIntangibleAssets	113000000	usd
CY2021	aon	Amortization And Impairment Of Intangible Assets AmortizationAndImpairmentOfIntangibleAssets	147000000	usd
CY2022	aon	Other General Expenses OtherGeneralExpenses	1271000000	usd
CY2021	us-gaap	Costs And Expenses CostsAndExpenses	10103000000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	3669000000	usd
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	2090000000	usd
CY2022	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	18000000	usd
CY2021	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	11000000	usd
CY2021	us-gaap	Interest Expense InterestExpense	322000000	usd
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0000315293
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	L2
CY2023	us-gaap	Derivative Gain Loss Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#OtherNonoperatingIncomeExpense
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CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	1-7933
CY2023	dei	Entity Registrant Name EntityRegistrantName	Aon plc
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	98-1539969
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	Metropolitan Building, James Joyce Street
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Dublin 1
CY2023	dei	Entity Address Country EntityAddressCountry	IE
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	D01 K0Y8
CY2023	dei	Country Region CountryRegion	353
CY2023	dei	City Area Code CityAreaCode	1
CY2023	dei	Local Phone Number LocalPhoneNumber	266 6000
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2023	dei	Auditor Location AuditorLocation	Chicago, Illinois
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CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	12.23
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CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1790000000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1924000000	usd
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CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	646000000	usd
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CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	6645000000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	778000000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	690000000	usd
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CY2022Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	0	usd
CY2021Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	0	usd
CY2023Q4	us-gaap	Funds Held For Clients FundsHeldForClients	6901000000	usd
CY2022Q4	us-gaap	Funds Held For Clients FundsHeldForClients	6386000000	usd
CY2021Q4	us-gaap	Funds Held For Clients FundsHeldForClients	6101000000	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
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	6645000000	usd
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CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	412000000	usd
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:8pt"><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 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 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 Consolidated Financial Statements in future periods.</span></div>
CY2023Q4	aon	Cashand Cash Equivalentsand Short Term Investments CashandCashEquivalentsandShortTermInvestments	1147000000	usd
CY2022Q4	aon	Cashand Cash Equivalentsand Short Term Investments CashandCashEquivalentsandShortTermInvestments	1142000000	usd
CY2023	aon	Cash And Cash Equivalents And Short Term Investments Period Increase Decrease CashAndCashEquivalentsAndShortTermInvestmentsPeriodIncreaseDecrease	5000000	usd
CY2023Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	120000000	usd
CY2022Q4	us-gaap	Restricted Cash And Investments Current RestrictedCashAndInvestmentsCurrent	115000000	usd
CY2023Q4	aon	Restricted Cash Operating Funds RestrictedCashOperatingFunds	63200000	gbp
CY2023Q4	aon	Restricted Cash Operating Funds RestrictedCashOperatingFunds	80400000	usd
CY2022Q4	aon	Restricted Cash Operating Funds RestrictedCashOperatingFunds	60100000	gbp
CY2022Q4	aon	Restricted Cash Operating Funds RestrictedCashOperatingFunds	72500000	usd
CY2023Q4	aon	Fiduciary Assets Premium Trust Balances FiduciaryAssetsPremiumTrustBalances	6900000000	usd
CY2022Q4	aon	Fiduciary Assets Premium Trust Balances FiduciaryAssetsPremiumTrustBalances	6400000000	usd
CY2023Q4	aon	Fiduciary Receivables FiduciaryReceivables	9400000000	usd
CY2022Q4	aon	Fiduciary Receivables FiduciaryReceivables	9500000000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	76000000	usd
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	13376000000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12479000000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12193000000	usd
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	13376000000	usd
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12479000000	usd
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	12193000000	usd
CY2023	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-99000000	usd
CY2022	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-14000000	usd
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	26000000	usd
CY2023	us-gaap	Pension Expense PensionExpense	98000000	usd
CY2022	us-gaap	Pension Expense PensionExpense	179000000	usd
CY2021	us-gaap	Pension Expense PensionExpense	-21000000	usd
CY2023	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	4000000	usd
CY2022	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	54000000	usd
CY2021	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	142000000	usd
CY2023	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	5000000	usd
CY2022	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	10000000	usd
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	8000000	usd
CY2023	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	25000000	usd
CY2022	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	4000000	usd
CY2021	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-45000000	usd
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-163000000	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-125000000	usd
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	152000000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	76000000	usd
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	90000000	usd
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	98000000	usd
CY2023	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	13000000	usd
CY2022	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	8000000	usd
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	26000000	usd
CY2023	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	11000000	usd
CY2022	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	18000000	usd
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	37000000	usd
CY2023	aon	Accounts Receivable Allowance For Credit Loss Foreign Currency Translation And Other AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther	1000000	usd
CY2022	aon	Accounts Receivable Allowance For Credit Loss Foreign Currency Translation And Other AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther	-4000000	usd
CY2021	aon	Accounts Receivable Allowance For Credit Loss Foreign Currency Translation And Other AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther	3000000	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
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	90000000	usd
CY2023Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	370000000	usd
CY2022Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	355000000	usd
CY2023Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	354000000	usd
CY2022Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	0	usd
CY2023Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	100000000	usd
CY2022Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	109000000	usd
CY2023Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	35000000	usd
CY2022Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	74000000	usd
CY2023Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	137000000	usd
CY2022Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	108000000	usd
CY2023Q4	us-gaap	Other Assets Current OtherAssetsCurrent	996000000	usd
CY2022Q4	us-gaap	Other Assets Current OtherAssetsCurrent	646000000	usd
CY2022Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	250000000	usd
CY2023Q4	aon	Operating Lease And Finance Lease Liability Current OperatingLeaseAndFinanceLeaseLiabilityCurrent	182000000	usd
CY2022Q4	aon	Operating Lease And Finance Lease Liability Current OperatingLeaseAndFinanceLeaseLiabilityCurrent	186000000	usd
CY2023Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	69000000	usd
CY2022Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	0	usd
CY2023Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	1066000000	usd
CY2022Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	718000000	usd
CY2023Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1878000000	usd
CY2022Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1347000000	usd
CY2023	aon	Contract With Customer Liability Including New Contract Revenue Recognized ContractWithCustomerLiabilityIncludingNewContractRevenueRecognized	647000000	usd
CY2022	aon	Contract With Customer Liability Including New Contract Revenue Recognized ContractWithCustomerLiabilityIncludingNewContractRevenueRecognized	653000000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2136000000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1949000000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1498000000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1391000000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	638000000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	558000000	usd
CY2023	us-gaap	Depreciation Depreciation	167000000	usd
CY2022	us-gaap	Depreciation Depreciation	151000000	usd
CY2021	us-gaap	Depreciation Depreciation	179000000	usd
CY2023Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	195000000	usd
CY2022Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	185000000	usd
CY2023Q4	us-gaap	Income Taxes Receivable Noncurrent IncomeTaxesReceivableNoncurrent	100000000	usd
CY2022Q4	us-gaap	Income Taxes Receivable Noncurrent IncomeTaxesReceivableNoncurrent	109000000	usd
CY2023Q4	us-gaap	Long Term Investments LongTermInvestments	45000000	usd
CY2022Q4	us-gaap	Long Term Investments LongTermInvestments	60000000	usd
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	26000000	usd
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	43000000	usd
CY2023Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	140000000	usd
CY2022Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	112000000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	506000000	usd
CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	509000000	usd
CY2023Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	291000000	usd
CY2022Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	193000000	usd
CY2023Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	270000000	usd
CY2023Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	827000000	usd
CY2022Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	795000000	usd
CY2023Q4	aon	Employeerelated Liabilities Noncurrent EmployeerelatedLiabilitiesNoncurrent	59000000	usd
CY2022Q4	aon	Employeerelated Liabilities Noncurrent EmployeerelatedLiabilitiesNoncurrent	69000000	usd
CY2023Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	33000000	usd
CY2022Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	37000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	10000000	usd
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	28000000	usd
CY2023Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	145000000	usd
CY2022Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	95000000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1074000000	usd
CY2022Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1024000000	usd
CY2023Q4	us-gaap	Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Liability Noncurrent TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiabilityNoncurrent	72000000	usd
CY2022Q4	us-gaap	Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Liability Noncurrent TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiabilityNoncurrent	129000000	usd
CY2023	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	3	acquisition
CY2022	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	5	acquisition
CY2023	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P8Y
CY2023	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	4000000	usd
CY2023	aon	Number Of Dispositions NumberOfDispositions	2	disposition
CY2022	aon	Number Of Dispositions NumberOfDispositions	3	disposition
CY2021	aon	Number Of Dispositions NumberOfDispositions	6	disposition
CY2023	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	4000000	usd
CY2022	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	54000000	usd
CY2021	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	142000000	usd
CY2023Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	354000000	usd
CY2023Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	69000000	usd
CY2023Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	11199000000	usd
CY2022Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	10770000000	usd
CY2023Q4	us-gaap	Debt Current DebtCurrent	1204000000	usd
CY2022Q4	us-gaap	Debt Current DebtCurrent	945000000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	9995000000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	9825000000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	8434000000	usd
CY2022	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	87000000	usd
CY2022	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	11000000	usd
CY2022	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-218000000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	8292000000	usd
CY2023	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	23000000	usd
CY2023	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	1000000	usd
CY2023	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	100000000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	8414000000	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
CY2022Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	2657000000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2210000000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	447000000	usd
CY2023	aon	Amortization And Impairment Of Intangible Assets AmortizationAndImpairmentOfIntangibleAssets	89000000	usd
CY2022	aon	Amortization And Impairment Of Intangible Assets AmortizationAndImpairmentOfIntangibleAssets	113000000	usd
CY2021	aon	Amortization And Impairment Of Intangible Assets AmortizationAndImpairmentOfIntangibleAssets	147000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	65000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	54000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	35000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	23000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	17000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	40000000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	234000000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1204000000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	750000000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	552000000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	1121000000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	350000000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	7356000000	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	11333000000	usd
CY2023Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	134000000	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	11199000000	usd
CY2023Q4	aon	Number Of Credit Facilities NumberOfCreditFacilities	2	credit_facility
CY2023Q4	aon	Number Of Credit Facilities NumberOfCreditFacilities	2	credit_facility
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	650000000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	699000000	usd
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	26000000	usd
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	43000000	usd
CY2023Q4	aon	Operating Lease And Finance Lease Rightof Use Asset OperatingLeaseAndFinanceLeaseRightofUseAsset	676000000	usd
CY2022Q4	aon	Operating Lease And Finance Lease Rightof Use Asset OperatingLeaseAndFinanceLeaseRightofUseAsset	742000000	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	159000000	usd
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	163000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	23000000	usd
CY2022Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	23000000	usd
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	641000000	usd
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	693000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	10000000	usd
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	28000000	usd
CY2023Q4	aon	Operating And Finance Lease Liability OperatingAndFinanceLeaseLiability	833000000	usd
CY2022Q4	aon	Operating And Finance Lease Liability OperatingAndFinanceLeaseLiability	907000000	usd
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	183000000	usd
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	204000000	usd
CY2023	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	19000000	usd
CY2022	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	28000000	usd
CY2023	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	usd
CY2022	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1000000	usd
CY2023	us-gaap	Variable Lease Cost VariableLeaseCost	44000000	usd
CY2022	us-gaap	Variable Lease Cost VariableLeaseCost	38000000	usd
CY2023	us-gaap	Short Term Lease Cost ShortTermLeaseCost	8000000	usd
CY2022	us-gaap	Short Term Lease Cost ShortTermLeaseCost	11000000	usd
CY2023	us-gaap	Sublease Income SubleaseIncome	13000000	usd
CY2022	us-gaap	Sublease Income SubleaseIncome	29000000	usd
CY2023	us-gaap	Lease Cost LeaseCost	241000000	usd
CY2022	us-gaap	Lease Cost LeaseCost	253000000	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y3M18D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y8M12D
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y6M
CY2022Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y6M
CY2023Q4	us-gaap	Lessee Operating Lease Discount Rate LesseeOperatingLeaseDiscountRate	0.036
CY2022Q4	us-gaap	Lessee Operating Lease Discount Rate LesseeOperatingLeaseDiscountRate	0.031
CY2023Q4	us-gaap	Lessee Finance Lease Discount Rate LesseeFinanceLeaseDiscountRate	0.010
CY2022Q4	us-gaap	Lessee Finance Lease Discount Rate LesseeFinanceLeaseDiscountRate	0.010
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	206000000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	231000000	usd
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	19000000	usd
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	14000000	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	112000000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	110000000	usd
CY2023	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	141000000	usd
CY2022	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	162000000	usd
CY2023	aon	Increase Decrease In Operating Lease Liabilities Noncurrent IncreaseDecreaseInOperatingLeaseLiabilitiesNoncurrent	-52000000	usd
CY2022	aon	Increase Decrease In Operating Lease Liabilities Noncurrent IncreaseDecreaseInOperatingLeaseLiabilitiesNoncurrent	-79000000	usd
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CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	177000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	23000000	usd
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CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	162000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	10000000	usd
CY2023Q4	aon	Financing And Operating Lease Liability Payments Net Of Sublease Income Due Year Two FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo	172000000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	140000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	0	usd
CY2023Q4	aon	Financing And Operating Lease Liability Payments Net Of Sublease Income Due Year Three FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree	140000000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	122000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	0	usd
CY2023Q4	aon	Financing And Operating Lease Liability Payments Net Of Sublease Income Due Year Four FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour	122000000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	98000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	0	usd
CY2023Q4	aon	Financing And Operating Lease Liability Payments Net Of Sublease Income Due Year Five FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive	98000000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	190000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	usd
CY2023Q4	aon	Financing And Operating Lease Liability Payments Net Of Sublease Income Due After Year Five FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueAfterYearFive	190000000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	889000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	33000000	usd
CY2023Q4	aon	Financing And Operating Lease Liability Payments Net Of Sublease Income Due FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDue	922000000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	89000000	usd
CY2023Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	0	usd
CY2023Q4	aon	Financing And Operating Lease Liability Net Of Sublease Income Undiscounted Excess Amount FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncomeUndiscountedExcessAmount	89000000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	800000000	usd
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	33000000	usd
CY2023Q4	aon	Financing And Operating Lease Liability Net Of Sublease Income FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncome	833000000	usd
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CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3156000000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1931000000	usd
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	914000000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	762000000	usd
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	612000000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-373000000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-252000000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	11000000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	541000000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	510000000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	623000000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.250
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.250
CY2023	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.006
CY2022	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.004
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.015
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.112
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.116
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.154
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.032
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.024
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.033
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	0.005
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	-0.070
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	-0.002
CY2023	aon	Effective Income Tax Rate Reconciliation Deferred Tax Adjustments Including Statutory Rate Changes Percent EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsIncludingStatutoryRateChangesPercent	-0.003
CY2022	aon	Effective Income Tax Rate Reconciliation Deferred Tax Adjustments Including Statutory Rate Changes Percent EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsIncludingStatutoryRateChangesPercent	-0.005
CY2021	aon	Effective Income Tax Rate Reconciliation Deferred Tax Adjustments Including Statutory Rate Changes Percent EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsIncludingStatutoryRateChangesPercent	0.032
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0.007
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0.002
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0.018
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.025
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.019
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.002
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.026
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.086
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.021
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.016
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.015
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.024
CY2023	aon	Effective Income Tax Rate Reconciliation Capital And Other Losses Percent EffectiveIncomeTaxRateReconciliationCapitalAndOtherLossesPercent	0
CY2022	aon	Effective Income Tax Rate Reconciliation Capital And Other Losses Percent EffectiveIncomeTaxRateReconciliationCapitalAndOtherLossesPercent	-0.014
CY2021	aon	Effective Income Tax Rate Reconciliation Capital And Other Losses Percent EffectiveIncomeTaxRateReconciliationCapitalAndOtherLossesPercent	0
CY2023	aon	Effective Income Tax Rate Reconciliation Nondeductible Expense Transaction Costs Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCostsPercent	0
CY2022	aon	Effective Income Tax Rate Reconciliation Nondeductible Expense Transaction Costs Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCostsPercent	0
CY2021	aon	Effective Income Tax Rate Reconciliation Nondeductible Expense Transaction Costs Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCostsPercent	0.011
CY2023	aon	Effective Income Tax Rate Reconciliation Nondeductible Expense Termination Fee Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTerminationFeePercent	0
CY2022	aon	Effective Income Tax Rate Reconciliation Nondeductible Expense Termination Fee Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTerminationFeePercent	0
CY2021	aon	Effective Income Tax Rate Reconciliation Nondeductible Expense Termination Fee Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTerminationFeePercent	0.129
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.001
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.004
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.171
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.162
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.323
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.250
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.250
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.250
CY2023Q4	aon	Deferred Tax Assets Net Operating And Capital Loss Carryforwards And Tax Credit Carryforwards DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards	1049000000	usd
CY2022Q4	aon	Deferred Tax Assets Net Operating And Capital Loss Carryforwards And Tax Credit Carryforwards DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards	952000000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	337000000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	297000000	usd
CY2023Q4	aon	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	164000000	usd
CY2022Q4	aon	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	178000000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	155000000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	100000000	usd
CY2023Q4	aon	Deferred Tax Assets Federal And State Benefit Of Interest From Uncertain Tax Positions DeferredTaxAssetsFederalAndStateBenefitOfInterestFromUncertainTaxPositions	75000000	usd
CY2022Q4	aon	Deferred Tax Assets Federal And State Benefit Of Interest From Uncertain Tax Positions DeferredTaxAssetsFederalAndStateBenefitOfInterestFromUncertainTaxPositions	57000000	usd
CY2023Q4	aon	Deferred Tax Assets Accrued Interest DeferredTaxAssetsAccruedInterest	52000000	usd
CY2022Q4	aon	Deferred Tax Assets Accrued Interest DeferredTaxAssetsAccruedInterest	0	usd
CY2023Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	25000000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	26000000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	49000000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	30000000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	40000000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	39000000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1946000000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1679000000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	197000000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	275000000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1749000000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1404000000	usd
CY2023Q4	aon	Deferred Tax Liabilities Intangible Assets And Property Plant And Equipment DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment	254000000	usd
CY2022Q4	aon	Deferred Tax Liabilities Intangible Assets And Property Plant And Equipment DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment	258000000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	149000000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	147000000	usd
CY2023Q4	aon	Deferred Tax Liabilities Lease Rightof Use Asset DeferredTaxLiabilitiesLeaseRightofUseAsset	135000000	usd
CY2022Q4	aon	Deferred Tax Liabilities Lease Rightof Use Asset DeferredTaxLiabilitiesLeaseRightofUseAsset	151000000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	44000000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	38000000	usd
CY2023Q4	aon	Deferred Tax Liabilities Other Accrued Expenses DeferredTaxLiabilitiesOtherAccruedExpenses	20000000	usd
CY2022Q4	aon	Deferred Tax Liabilities Other Accrued Expenses DeferredTaxLiabilitiesOtherAccruedExpenses	20000000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Unrealized Currency Transaction Gains DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains	18000000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Unrealized Currency Transaction Gains DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains	23000000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	49000000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	42000000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	669000000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	679000000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1080000000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	725000000	usd
CY2022Q4	aon	Deferred Tax Assets Lease And Service Guarantees DeferredTaxAssetsLeaseAndServiceGuarantees	1000000	usd
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	1195000000	usd
CY2022Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	824000000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	115000000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	99000000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1080000000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	725000000	usd
CY2023	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-78000000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	44000000	usd
CY2023Q4	aon	Distributable Reserves Available Amount DistributableReservesAvailableAmount	27500000000	usd
CY2023	aon	Income Tax Holiday Income Tax Benefits IncomeTaxHolidayIncomeTaxBenefits	93000000	usd
CY2022	aon	Income Tax Holiday Income Tax Benefits IncomeTaxHolidayIncomeTaxBenefits	115000000	usd
CY2021	aon	Income Tax Holiday Income Tax Benefits IncomeTaxHolidayIncomeTaxBenefits	104000000	usd
CY2023	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	0.45
CY2022	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	0.54
CY2021	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	0.46
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	601000000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	347000000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	40000000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	35000000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2000000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	226000000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	3000000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1000000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	1000000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	usd
CY2023	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3000000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	5000000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation	0	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation	0	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	637000000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	601000000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	570000000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	535000000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	295000000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	62000000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	40000000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	22000000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	244000000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	181000000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	142000000	usd
CY2022Q4	aon	Distributable Reserves Available Amount DistributableReservesAvailableAmount	29000000000	usd
CY2012Q2	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	5000000000	usd
CY2017Q2	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
CY2014Q4	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
CY2023Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	27500000000	usd
CY2023	us-gaap	Schedule Of Repurchase Agreements ScheduleOfRepurchaseAgreements	<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 following table summarizes the Company’s share repurchase activity (in millions, except per share data):</span></div><div style="margin-bottom:3pt;margin-top:8pt;text-align:justify"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:99.707%"><tr><td style="width:1.0%"></td><td style="width:48.166%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.533%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:23.533%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.533%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:23.535%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><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%">Years Ended December 31</span></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><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%">2023</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%">2022</span></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="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%">8.4 </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%">11.1 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></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 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%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">321.52 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</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%">289.76 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></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></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></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></tr><tr><td colspan="3" style="background-color:#cceeff;border-bottom:1pt solid #000;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%">Repurchase costs recorded to Accumulated deficit</span></td><td colspan="3" style="background-color:#cceeff;border-bottom:1pt solid #000000;padding:0 1pt"></td><td style="background-color:#cceeff;border-bottom:1pt solid #000000;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%">$</span></td><td style="background-color:#cceeff;border-bottom:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">2,700 </span></td><td style="background-color:#cceeff;border-bottom:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;border-bottom:1pt solid #000000;padding:0 1pt"></td><td style="background-color:#cceeff;border-bottom:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-bottom:1pt solid #000000;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%">3,203 </span></td><td style="background-color:#cceeff;border-bottom:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr></table></div>
CY2023	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	8400000	shares
CY2022	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	11100000	shares
CY2023	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	321.52
CY2022	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	289.76
CY2023	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2700000000	usd
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	3203000000	usd
CY2023Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	3300000000	usd
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	169100000	shares
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	24200000000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	203500000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	211700000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	224700000	shares
CY2023	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1500000	shares
CY2022	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1500000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1400000	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	205000000.0	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	213200000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	226100000	shares
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	800000	shares
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	300000	shares
CY2021	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-63000000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	56000000	usd
CY2021	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-119000000	usd
CY2021	us-gaap	Reclassification From Aoci Current Period Before Tax Attributable To Parent ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent	-144000000	usd
CY2021	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-35000000	usd
CY2021	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-109000000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-10000000	usd
CY2022	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-1112000000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	-153000000	usd
CY2022	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-959000000	usd
CY2022	us-gaap	Reclassification From Aoci Current Period Before Tax Attributable To Parent ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent	-280000000	usd
CY2022	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-73000000	usd
CY2022	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-207000000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-752000000	usd
CY2023	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	74000000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	-52000000	usd
CY2023	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	126000000	usd
CY2023	us-gaap	Reclassification From Aoci Current Period Before Tax Attributable To Parent ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent	-167000000	usd
CY2023	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-43000000	usd
CY2023	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-124000000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	250000000	usd
CY2023	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	199000000	usd
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	188000000	usd
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	184000000	usd
CY2023Q4	aon	Defined Benefit Plan Percentage Of Total Pension Obligations DefinedBenefitPlanPercentageOfTotalPensionObligations	0.88
CY2023	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	438000000	usd
CY2022	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	397000000	usd
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	449000000	usd
CY2023	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	91000000	usd
CY2022	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	83000000	usd
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	87000000	usd
CY2023	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	347000000	usd
CY2022	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	314000000	usd
CY2021	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	362000000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	8000000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-15000000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	0	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-8000000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	2000000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-2000000	usd
CY2023	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	-4000000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	0	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	0	usd
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	0	usd
CY2023Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	86000000	usd
CY2022Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	74000000	usd
CY2023Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	194000000	usd
CY2022Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	173000000	usd
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2023	aon	Numberof Revenue Lines NumberofRevenueLines	4	revenue_line
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2023	aon	Number Of Performance Metrics Measured NumberOfPerformanceMetricsMeasured	4	performance_metric
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2023Q4	aon	Property Plant And Equipment And Operating Lease Right Of Use Asset After Accumulated Depreciationand Amortization PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization	1314000000	usd
CY2022Q4	aon	Property Plant And Equipment And Operating Lease Right Of Use Asset After Accumulated Depreciationand Amortization PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization	1300000000	usd
CY2023	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2023	dei	Auditor Firm AuditorFirmId	42

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