$AON
Aon PLC

2019 Q4 Form 10-K Financial Statement

#000162828021002574 Filed on February 19, 2021

View on sec.gov

Income Statement

Concept 2019 Q4 2018 Q4 2018
Revenue $2.885B $2.770B $10.77B
YoY Change 4.15% -4.78% 7.72%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin $2.053B $2.003B $7.985B
YoY Change 2.5% -7.65% -0.71%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization $145.0M $151.0M $176.0M
YoY Change -3.97% 8.63% -5.88%
% of Gross Profit
Operating Expenses $2.191B $2.152B $8.565B
YoY Change 1.81% -6.76% 0.14%
Operating Profit $524.0M $499.0M $1.544B
YoY Change 5.01% -16.97% 44.98%
Interest Expense -$85.00M -$82.00M $278.0M
YoY Change 3.66% 13.89% -1.42%
% of Operating Profit -16.22% -16.43% 18.01%
Other Income/Expense, Net -$3.000M $6.000M -$25.00M
YoY Change -150.0% -105.5% -80.0%
Pretax Income $441.0M $421.0M $1.246B
YoY Change 4.75% 3.69% 81.9%
Income Tax $59.00M $49.00M $146.0M
% Of Pretax Income 13.38% 11.64% 11.72%
Net Earnings $382.0M $353.0M $1.174B
YoY Change 8.22% -3041.67% -7.05%
Net Earnings / Revenue 13.24% 12.74% 10.9%
Basic Earnings Per Share $1.59 $1.42 $4.62
Diluted Earnings Per Share $1.58 $1.41 $4.59
COMMON SHARES
Basic Shares Outstanding 234.1M shares 240.8M shares 245.2M shares
Diluted Shares Outstanding 247.0M shares

Balance Sheet

Concept 2019 Q4 2018 Q4 2018
SHORT-TERM ASSETS
Cash & Short-Term Investments $6.082B $4.728B $4.728B
YoY Change 28.64% 267.94% 267.94%
Cash & Equivalents $790.0M $656.0M $656.0M
Short-Term Investments $5.292B $4.072B $4.072B
Other Short-Term Assets $602.0M $618.0M $176.0M
YoY Change -2.59% 113.84% -98.2%
Inventory
Prepaid Expenses $97.00M $97.00M
Receivables $3.112B $2.760B $9.355B
Other Receivables $88.00M $113.0M $113.0M
Total Short-Term Assets $16.48B $14.37B $14.37B
YoY Change 14.64% 5.08% 5.08%
LONG-TERM ASSETS
Property, Plant & Equipment $621.0M $588.0M $588.0M
YoY Change 5.61% 4.26% 4.26%
Goodwill $8.165B $8.171B
YoY Change -0.07% -2.24%
Intangibles $783.0M $1.149B
YoY Change -31.85% -33.7%
Long-Term Investments $53.00M $54.00M $54.00M
YoY Change -1.85% -5.26% -5.26%
Other Assets $570.0M $448.0M $1.832B
YoY Change 27.23% 45.93% 13.44%
Total Long-Term Assets $12.93B $588.0M $12.05B
YoY Change 2098.81% 4.26% -2.91%
TOTAL ASSETS
Total Short-Term Assets $16.48B $14.37B $14.37B
Total Long-Term Assets $12.93B $588.0M $12.05B
Total Assets $29.41B $26.42B $26.42B
YoY Change 11.29% 1.28% 1.28%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable $1.939B $1.943B $1.943B
YoY Change -0.21% -0.92% -0.92%
Accrued Expenses $186.0M
YoY Change
Deferred Revenue $270.0M $251.0M
YoY Change 7.57% -19.29%
Short-Term Debt $0.00 $0.00 $250.0M
YoY Change
Long-Term Debt Due $736.0M $251.0M $1.000M
YoY Change 193.23% -16.05% -99.67%
Total Short-Term Liabilities $15.57B $13.30B $13.30B
YoY Change 17.11% 4.24% 4.24%
LONG-TERM LIABILITIES
Long-Term Debt $6.627B $5.993B $6.162B
YoY Change 10.58% 5.75% 5.88%
Other Long-Term Liabilities $877.0M $1.097B $2.564B
YoY Change -20.05% -0.45% -6.36%
Total Long-Term Liabilities $7.504B $7.090B $8.726B
YoY Change 5.84% 4.74% 1.96%
TOTAL LIABILITIES
Total Short-Term Liabilities $15.57B $13.30B $13.30B
Total Long-Term Liabilities $7.504B $7.090B $8.726B
Total Liabilities $25.96B $22.20B $22.27B
YoY Change 16.9% 3.56% 3.56%
SHAREHOLDERS EQUITY
Retained Earnings $1.254B $2.093B
YoY Change -40.09% -9.08%
Common Stock $6.154B $5.967B
YoY Change 3.13% 3.29%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity $3.375B $4.151B $4.151B
YoY Change
Total Liabilities & Shareholders Equity $29.41B $26.42B $26.42B
YoY Change 11.29% 1.28% 1.28%

Cashflow Statement

Concept 2019 Q4 2018 Q4 2018
OPERATING ACTIVITIES
Net Income $382.0M $353.0M $1.174B
YoY Change 8.22% -3041.67% -7.05%
Depreciation, Depletion And Amortization $145.0M $151.0M $176.0M
YoY Change -3.97% 8.63% -5.88%
Cash From Operating Activities $672.0M $711.0M $1.686B
YoY Change -5.49% 86.61% 129.7%
INVESTING ACTIVITIES
Capital Expenditures -$58.00M -$61.00M $240.0M
YoY Change -4.92% 5.17% 31.15%
Acquisitions $58.00M
YoY Change -94.36%
Other Investing Activities $60.00M $8.000M $271.0M
YoY Change 650.0% -97.52% -90.88%
Cash From Investing Activities $2.000M -$53.00M $31.00M
YoY Change -103.77% -120.0% -98.89%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net $5.417B
YoY Change 170.99%
Cash From Financing Activities -525.0M -444.0M -$1.699B
YoY Change 18.24% -28.04% -47.96%
NET CHANGE
Cash From Operating Activities 672.0M 711.0M $1.686B
Cash From Investing Activities 2.000M -53.00M $31.00M
Cash From Financing Activities -525.0M -444.0M -$1.699B
Net Change In Cash 149.0M 214.0M -$100.0M
YoY Change -30.37% 637.93% -130.77%
FREE CASH FLOW
Cash From Operating Activities $672.0M $711.0M $1.686B
Capital Expenditures -$58.00M -$61.00M $240.0M
Free Cash Flow $730.0M $772.0M $1.446B
YoY Change -5.44% 75.85% 162.43%

Facts In Submission

Frame Concept Type Concept / XBRL Key Value Unit
CY2020 dei Entity Central Index Key
EntityCentralIndexKey
0000315293
CY2020 dei Amendment Flag
AmendmentFlag
false
CY2020 dei Document Fiscal Year Focus
DocumentFiscalYearFocus
2020
CY2020 dei Document Fiscal Period Focus
DocumentFiscalPeriodFocus
FY
CY2020 dei Entity Incorporation State Country Code
EntityIncorporationStateCountryCode
L2
CY2020Q4 us-gaap Operating Lease Liability Current Statement Of Financial Position Extensible List
OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList
us-gaap:OtherLiabilitiesCurrent
CY2019Q4 us-gaap Operating Lease Liability Current Statement Of Financial Position Extensible List
OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList
us-gaap:OtherLiabilitiesCurrent
CY2020Q4 us-gaap Finance Lease Liability Current Statement Of Financial Position Extensible List
FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList
us-gaap:OtherLiabilitiesCurrent
CY2019Q4 us-gaap Finance Lease Liability Current Statement Of Financial Position Extensible List
FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList
us-gaap:OtherLiabilitiesCurrent
CY2019Q4 us-gaap Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List
FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList
us-gaap:OtherLiabilitiesNoncurrent
CY2020Q4 us-gaap Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List
FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList
us-gaap:OtherLiabilitiesNoncurrent
CY2020Q4 us-gaap Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List
FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList
us-gaap:OtherAssetsNoncurrent
CY2019Q4 us-gaap Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List
FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList
us-gaap:OtherAssetsNoncurrent
CY2020 dei Document Type
DocumentType
10-K
CY2020 dei Document Annual Report
DocumentAnnualReport
true
CY2020 dei Document Period End Date
DocumentPeriodEndDate
2020-12-31
CY2020 dei Current Fiscal Year End Date
CurrentFiscalYearEndDate
--12-31
CY2020 dei Document Transition Report
DocumentTransitionReport
false
CY2020 dei Entity File Number
EntityFileNumber
1-7933
CY2020 dei Entity Registrant Name
EntityRegistrantName
Aon plc
CY2020 dei Entity Interactive Data Current
EntityInteractiveDataCurrent
Yes
CY2020 dei Entity Current Reporting Status
EntityCurrentReportingStatus
Yes
CY2020 dei Entity Tax Identification Number
EntityTaxIdentificationNumber
98-1539969
CY2020 dei Entity Address Address Line1
EntityAddressAddressLine1
Metropolitan Building, James Joyce Street
CY2020 dei Entity Address City Or Town
EntityAddressCityOrTown
Dublin 1
CY2020 dei Entity Address Country
EntityAddressCountry
IE
CY2020 dei Entity Address Postal Zip Code
EntityAddressPostalZipCode
D01 K0Y8
CY2020 dei City Area Code
CityAreaCode
1
CY2020 dei Local Phone Number
LocalPhoneNumber
266 6000
CY2020 dei Entity Well Known Seasoned Issuer
EntityWellKnownSeasonedIssuer
Yes
CY2020 dei Entity Voluntary Filers
EntityVoluntaryFilers
No
CY2020 dei Entity Filer Category
EntityFilerCategory
Large Accelerated Filer
CY2020 dei Entity Small Business
EntitySmallBusiness
false
CY2020 dei Entity Emerging Growth Company
EntityEmergingGrowthCompany
false
CY2020 dei Icfr Auditor Attestation Flag
IcfrAuditorAttestationFlag
true
CY2020 dei Entity Shell Company
EntityShellCompany
false
CY2020Q2 dei Entity Public Float
EntityPublicFloat
44593079186 USD
CY2021Q1 dei Entity Common Stock Shares Outstanding
EntityCommonStockSharesOutstanding
225984346 shares
CY2019 us-gaap Labor And Related Expense
LaborAndRelatedExpense
6054000000 USD
CY2020 us-gaap Revenue From Contract With Customer Excluding Assessed Tax
RevenueFromContractWithCustomerExcludingAssessedTax
11066000000 USD
CY2019 us-gaap Revenue From Contract With Customer Excluding Assessed Tax
RevenueFromContractWithCustomerExcludingAssessedTax
11013000000 USD
CY2018 us-gaap Revenue From Contract With Customer Excluding Assessed Tax
RevenueFromContractWithCustomerExcludingAssessedTax
10770000000 USD
CY2020 us-gaap Labor And Related Expense
LaborAndRelatedExpense
5905000000 USD
CY2018 us-gaap Labor And Related Expense
LaborAndRelatedExpense
6103000000 USD
CY2020 us-gaap Information Technology And Data Processing
InformationTechnologyAndDataProcessing
444000000 USD
CY2019 us-gaap Information Technology And Data Processing
InformationTechnologyAndDataProcessing
494000000 USD
CY2018 us-gaap Information Technology And Data Processing
InformationTechnologyAndDataProcessing
484000000 USD
CY2020 us-gaap Occupancy Net
OccupancyNet
291000000 USD
CY2019 us-gaap Occupancy Net
OccupancyNet
339000000 USD
CY2018 us-gaap Occupancy Net
OccupancyNet
370000000 USD
CY2020 us-gaap Depreciation
Depreciation
167000000 USD
CY2019 us-gaap Depreciation
Depreciation
172000000 USD
CY2018 us-gaap Depreciation
Depreciation
176000000 USD
CY2018 aon Amortization And Impairment Of Intangible Assets
AmortizationAndImpairmentOfIntangibleAssets
593000000 USD
CY2020 aon Amortization And Impairment Of Intangible Assets
AmortizationAndImpairmentOfIntangibleAssets
246000000 USD
CY2019 aon Amortization And Impairment Of Intangible Assets
AmortizationAndImpairmentOfIntangibleAssets
392000000 USD
CY2020 aon Other General Expenses
OtherGeneralExpenses
1232000000 USD
CY2019 aon Other General Expenses
OtherGeneralExpenses
1393000000 USD
CY2018 aon Other General Expenses
OtherGeneralExpenses
1500000000 USD
CY2020 us-gaap Costs And Expenses
CostsAndExpenses
8285000000 USD
CY2019 us-gaap Costs And Expenses
CostsAndExpenses
8844000000 USD
CY2018 us-gaap Costs And Expenses
CostsAndExpenses
9226000000 USD
CY2020 us-gaap Operating Income Loss
OperatingIncomeLoss
2781000000 USD
CY2019 us-gaap Operating Income Loss
OperatingIncomeLoss
2169000000 USD
CY2018 us-gaap Operating Income Loss
OperatingIncomeLoss
1544000000 USD
CY2020 us-gaap Investment Income Interest And Dividend
InvestmentIncomeInterestAndDividend
6000000 USD
CY2019 us-gaap Investment Income Interest And Dividend
InvestmentIncomeInterestAndDividend
8000000 USD
CY2018 us-gaap Investment Income Interest And Dividend
InvestmentIncomeInterestAndDividend
5000000 USD
CY2020 us-gaap Interest Expense
InterestExpense
334000000 USD
CY2019 us-gaap Interest Expense
InterestExpense
307000000 USD
CY2018 us-gaap Interest Expense
InterestExpense
278000000 USD
CY2020 us-gaap Other Nonoperating Income Expense
OtherNonoperatingIncomeExpense
12000000 USD
CY2019 us-gaap Other Nonoperating Income Expense
OtherNonoperatingIncomeExpense
1000000 USD
CY2018 us-gaap Other Nonoperating Income Expense
OtherNonoperatingIncomeExpense
-25000000 USD
CY2020 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
2465000000 USD
CY2019 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
1871000000 USD
CY2018 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
1246000000 USD
CY2020 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
448000000 USD
CY2019 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
297000000 USD
CY2018 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
146000000 USD
CY2020 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
2017000000 USD
CY2019 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
1574000000 USD
CY2018 us-gaap Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest
IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
1100000000 USD
CY2020 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
1000000 USD
CY2019 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
-1000000 USD
CY2020Q4 us-gaap Intangible Assets Net Excluding Goodwill
IntangibleAssetsNetExcludingGoodwill
640000000 USD
CY2018 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
74000000 USD
CY2020 us-gaap Profit Loss
ProfitLoss
2018000000 USD
CY2019 us-gaap Profit Loss
ProfitLoss
1573000000 USD
CY2018 us-gaap Profit Loss
ProfitLoss
1174000000 USD
CY2020 us-gaap Net Income Loss Attributable To Noncontrolling Interest
NetIncomeLossAttributableToNoncontrollingInterest
49000000 USD
CY2019 us-gaap Net Income Loss Attributable To Noncontrolling Interest
NetIncomeLossAttributableToNoncontrollingInterest
41000000 USD
CY2018 us-gaap Net Income Loss Attributable To Noncontrolling Interest
NetIncomeLossAttributableToNoncontrollingInterest
40000000 USD
CY2020 us-gaap Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
1969000000 USD
CY2019 us-gaap Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
1532000000 USD
CY2018 us-gaap Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
1134000000 USD
CY2020 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
8.49
CY2019 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
6.42
CY2018 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
4.32
CY2020 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
0
CY2019 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
0
CY2018 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Basic Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
0.30
CY2020 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
8.49
CY2019 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
6.42
CY2018 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
4.62
CY2020 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
8.45
CY2019 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
6.37
CY2018 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
4.29
CY2020 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
0
CY2019 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
0
CY2018 us-gaap Income Loss From Discontinued Operations Net Of Tax Per Diluted Share
IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
0.30
CY2020 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
8.45
CY2019 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
6.37
CY2018 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
4.59
CY2020 us-gaap Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
231900000 shares
CY2019 us-gaap Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
238600000 shares
CY2018 us-gaap Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
245200000 shares
CY2020 us-gaap Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
233100000 shares
CY2019 us-gaap Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
240600000 shares
CY2018 us-gaap Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
247000000.0 shares
CY2020 us-gaap Profit Loss
ProfitLoss
2018000000 USD
CY2019 us-gaap Profit Loss
ProfitLoss
1573000000 USD
CY2018 us-gaap Profit Loss
ProfitLoss
1174000000 USD
CY2020 us-gaap Net Income Loss Attributable To Noncontrolling Interest
NetIncomeLossAttributableToNoncontrollingInterest
49000000 USD
CY2019 us-gaap Net Income Loss Attributable To Noncontrolling Interest
NetIncomeLossAttributableToNoncontrollingInterest
41000000 USD
CY2018 us-gaap Net Income Loss Attributable To Noncontrolling Interest
NetIncomeLossAttributableToNoncontrollingInterest
40000000 USD
CY2020 us-gaap Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
1969000000 USD
CY2019 us-gaap Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
1532000000 USD
CY2018 us-gaap Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
1134000000 USD
CY2020 us-gaap Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax
OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
13000000 USD
CY2020 us-gaap Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax
OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
13000000 USD
CY2019 us-gaap Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax
OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
3000000 USD
CY2018 us-gaap Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax
OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
11000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax
OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
263000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax
OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
263000000 USD
CY2019 us-gaap Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax
OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
14000000 USD
CY2018 us-gaap Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax
OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
-444000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
101000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
101000000 USD
CY2019 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
141000000 USD
CY2018 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
-17000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Net Of Tax
OtherComprehensiveIncomeLossNetOfTax
175000000 USD
CY2019 us-gaap Other Comprehensive Income Loss Net Of Tax
OtherComprehensiveIncomeLossNetOfTax
-124000000 USD
CY2018 us-gaap Other Comprehensive Income Loss Net Of Tax
OtherComprehensiveIncomeLossNetOfTax
-416000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
3000000 USD
CY2019 us-gaap Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
0 USD
CY2018 us-gaap Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
-4000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
172000000 USD
CY2019 us-gaap Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
-124000000 USD
CY2018 us-gaap Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
-412000000 USD
CY2020 us-gaap Comprehensive Income Net Of Tax
ComprehensiveIncomeNetOfTax
2141000000 USD
CY2019 us-gaap Comprehensive Income Net Of Tax
ComprehensiveIncomeNetOfTax
1408000000 USD
CY2018 us-gaap Comprehensive Income Net Of Tax
ComprehensiveIncomeNetOfTax
722000000 USD
CY2020Q4 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
884000000 USD
CY2019Q4 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
790000000 USD
CY2020Q4 us-gaap Short Term Investments
ShortTermInvestments
308000000 USD
CY2019Q4 us-gaap Short Term Investments
ShortTermInvestments
138000000 USD
CY2020Q4 us-gaap Accounts Receivable Net Current
AccountsReceivableNetCurrent
3070000000 USD
CY2019Q4 us-gaap Accounts Receivable Net Current
AccountsReceivableNetCurrent
3112000000 USD
CY2020Q4 aon Fiduciary Assets
FiduciaryAssets
13798000000 USD
CY2019Q4 aon Fiduciary Assets
FiduciaryAssets
11834000000 USD
CY2020Q4 us-gaap Other Assets Current
OtherAssetsCurrent
624000000 USD
CY2019Q4 us-gaap Other Assets Current
OtherAssetsCurrent
602000000 USD
CY2020Q4 us-gaap Assets Current
AssetsCurrent
18684000000 USD
CY2019Q4 us-gaap Assets Current
AssetsCurrent
16476000000 USD
CY2020Q4 us-gaap Goodwill
Goodwill
8666000000 USD
CY2019Q4 us-gaap Goodwill
Goodwill
8165000000 USD
CY2019Q4 us-gaap Intangible Assets Net Excluding Goodwill
IntangibleAssetsNetExcludingGoodwill
783000000 USD
CY2020Q4 us-gaap Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
599000000 USD
CY2019Q4 us-gaap Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
621000000 USD
CY2020Q4 us-gaap Operating Lease Right Of Use Asset
OperatingLeaseRightOfUseAsset
911000000 USD
CY2019Q4 us-gaap Operating Lease Right Of Use Asset
OperatingLeaseRightOfUseAsset
929000000 USD
CY2020Q4 us-gaap Deferred Income Tax Assets Net
DeferredIncomeTaxAssetsNet
724000000 USD
CY2019Q4 us-gaap Deferred Income Tax Assets Net
DeferredIncomeTaxAssetsNet
645000000 USD
CY2020Q4 us-gaap Defined Benefit Plan Assets For Plan Benefits Noncurrent
DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
1280000000 USD
CY2019Q4 us-gaap Defined Benefit Plan Assets For Plan Benefits Noncurrent
DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
1216000000 USD
CY2020Q4 us-gaap Other Assets Noncurrent
OtherAssetsNoncurrent
610000000 USD
CY2019Q4 us-gaap Other Assets Noncurrent
OtherAssetsNoncurrent
570000000 USD
CY2020Q4 us-gaap Assets
Assets
32114000000 USD
CY2019Q4 us-gaap Assets
Assets
29405000000 USD
CY2020Q4 us-gaap Accounts Payable And Accrued Liabilities Current
AccountsPayableAndAccruedLiabilitiesCurrent
2016000000 USD
CY2019Q4 us-gaap Accounts Payable And Accrued Liabilities Current
AccountsPayableAndAccruedLiabilitiesCurrent
1939000000 USD
CY2020Q4 us-gaap Debt Current
DebtCurrent
448000000 USD
CY2019Q4 us-gaap Debt Current
DebtCurrent
712000000 USD
CY2020Q4 aon Fiduciary Liabilities
FiduciaryLiabilities
13798000000 USD
CY2019Q4 aon Fiduciary Liabilities
FiduciaryLiabilities
11834000000 USD
CY2020Q4 us-gaap Other Liabilities Current
OtherLiabilitiesCurrent
1171000000 USD
CY2019Q4 us-gaap Other Liabilities Current
OtherLiabilitiesCurrent
1086000000 USD
CY2020Q4 us-gaap Liabilities Current
LiabilitiesCurrent
17433000000 USD
CY2019Q4 us-gaap Liabilities Current
LiabilitiesCurrent
15571000000 USD
CY2020Q4 us-gaap Long Term Debt Noncurrent
LongTermDebtNoncurrent
7281000000 USD
CY2019Q4 us-gaap Long Term Debt Noncurrent
LongTermDebtNoncurrent
6627000000 USD
CY2020Q4 us-gaap Operating Lease Liability Noncurrent
OperatingLeaseLiabilityNoncurrent
897000000 USD
CY2019Q4 us-gaap Operating Lease Liability Noncurrent
OperatingLeaseLiabilityNoncurrent
944000000 USD
CY2020Q4 us-gaap Deferred Income Tax Liabilities Net
DeferredIncomeTaxLiabilitiesNet
262000000 USD
CY2019Q4 us-gaap Deferred Income Tax Liabilities Net
DeferredIncomeTaxLiabilitiesNet
199000000 USD
CY2020Q4 us-gaap Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent
PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent
1763000000 USD
CY2019Q4 us-gaap Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent
PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent
1738000000 USD
CY2020Q4 us-gaap Other Liabilities Noncurrent
OtherLiabilitiesNoncurrent
895000000 USD
CY2019Q4 us-gaap Other Liabilities Noncurrent
OtherLiabilitiesNoncurrent
877000000 USD
CY2020Q4 us-gaap Liabilities
Liabilities
28531000000 USD
CY2019Q4 us-gaap Liabilities
Liabilities
25956000000 USD
CY2019Q4 us-gaap Common Stock Par Or Stated Value Per Share
CommonStockParOrStatedValuePerShare
0.01
CY2020Q4 us-gaap Common Stock Par Or Stated Value Per Share
CommonStockParOrStatedValuePerShare
0.01
CY2020Q4 us-gaap Common Stock Shares Authorized
CommonStockSharesAuthorized
500000000 shares
CY2019Q4 us-gaap Common Stock Shares Authorized
CommonStockSharesAuthorized
750000000 shares
CY2020Q4 us-gaap Common Stock Shares Issued
CommonStockSharesIssued
225500000 shares
CY2019Q4 us-gaap Common Stock Shares Issued
CommonStockSharesIssued
232100000 shares
CY2020Q4 us-gaap Common Stock Value
CommonStockValue
2000000 USD
CY2019Q4 us-gaap Common Stock Value
CommonStockValue
2000000 USD
CY2020Q4 us-gaap Additional Paid In Capital Common Stock
AdditionalPaidInCapitalCommonStock
6312000000 USD
CY2019Q4 us-gaap Additional Paid In Capital Common Stock
AdditionalPaidInCapitalCommonStock
6152000000 USD
CY2020Q4 us-gaap Retained Earnings Accumulated Deficit
RetainedEarningsAccumulatedDeficit
1042000000 USD
CY2019Q4 us-gaap Retained Earnings Accumulated Deficit
RetainedEarningsAccumulatedDeficit
1254000000 USD
CY2020Q4 us-gaap Accumulated Other Comprehensive Income Loss Net Of Tax
AccumulatedOtherComprehensiveIncomeLossNetOfTax
-3861000000 USD
CY2019Q4 us-gaap Accumulated Other Comprehensive Income Loss Net Of Tax
AccumulatedOtherComprehensiveIncomeLossNetOfTax
-4033000000 USD
CY2020Q4 us-gaap Stockholders Equity
StockholdersEquity
3495000000 USD
CY2019Q4 us-gaap Stockholders Equity
StockholdersEquity
3375000000 USD
CY2020Q4 us-gaap Minority Interest
MinorityInterest
88000000 USD
CY2019Q4 us-gaap Minority Interest
MinorityInterest
74000000 USD
CY2020Q4 us-gaap Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
3583000000 USD
CY2019Q4 us-gaap Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
3449000000 USD
CY2020Q4 us-gaap Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
32114000000 USD
CY2019Q4 us-gaap Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
29405000000 USD
CY2017Q4 us-gaap Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
4648000000 USD
CY2018 us-gaap Profit Loss
ProfitLoss
1174000000 USD
CY2018 us-gaap Stock Issued During Period Value Share Based Compensation
StockIssuedDuringPeriodValueShareBasedCompensation
-148000000 USD
CY2018 us-gaap Stock Repurchased During Period Value
StockRepurchasedDuringPeriodValue
1454000000 USD
CY2018 us-gaap Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value
AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
338000000 USD
CY2018 us-gaap Common Stock Dividends Per Share Declared
CommonStockDividendsPerShareDeclared
1.56
CY2018 us-gaap Dividends Common Stock Cash
DividendsCommonStockCash
382000000 USD
CY2018 us-gaap Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax
OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
11000000 USD
CY2018 us-gaap Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax
OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
-444000000 USD
CY2018 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
-17000000 USD
CY2018 us-gaap Minority Interest Decrease From Redemptions
MinorityInterestDecreaseFromRedemptions
1000000 USD
CY2018 us-gaap Minority Interest Decrease From Distributions To Noncontrolling Interest Holders
MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
32000000 USD
CY2018Q4 us-gaap Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
4219000000 USD
CY2019 us-gaap Profit Loss
ProfitLoss
1573000000 USD
CY2019 us-gaap Stock Issued During Period Value Share Based Compensation
StockIssuedDuringPeriodValueShareBasedCompensation
-131000000 USD
CY2019 us-gaap Stock Repurchased During Period Value
StockRepurchasedDuringPeriodValue
1960000000 USD
CY2019 us-gaap Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value
AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
317000000 USD
CY2019 us-gaap Common Stock Dividends Per Share Declared
CommonStockDividendsPerShareDeclared
1.72
CY2019 us-gaap Dividends Common Stock Cash
DividendsCommonStockCash
410000000 USD
CY2019 us-gaap Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax
OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
3000000 USD
CY2019 us-gaap Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax
OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
14000000 USD
CY2019 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
141000000 USD
CY2019 us-gaap Minority Interest Decrease From Distributions To Noncontrolling Interest Holders
MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
35000000 USD
CY2019Q4 us-gaap Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
3449000000 USD
CY2020 us-gaap Profit Loss
ProfitLoss
2018000000 USD
CY2020 us-gaap Stock Issued During Period Value Share Based Compensation
StockIssuedDuringPeriodValueShareBasedCompensation
-154000000 USD
CY2020 us-gaap Stock Repurchased During Period Value
StockRepurchasedDuringPeriodValue
1763000000 USD
CY2020 us-gaap Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value
AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
317000000 USD
CY2020 us-gaap Common Stock Dividends Per Share Declared
CommonStockDividendsPerShareDeclared
1.78
CY2020 us-gaap Dividends Common Stock Cash
DividendsCommonStockCash
412000000 USD
CY2020 us-gaap Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax
OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
13000000 USD
CY2020 us-gaap Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax
OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
13000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax
OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
263000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax
OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
263000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
101000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
101000000 USD
CY2020 us-gaap Minority Interest Decrease From Redemptions
MinorityInterestDecreaseFromRedemptions
9000000 USD
CY2020 us-gaap Minority Interest Decrease From Distributions To Noncontrolling Interest Holders
MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
32000000 USD
CY2020Q4 us-gaap Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
3583000000 USD
CY2020 us-gaap Profit Loss
ProfitLoss
2018000000 USD
CY2019 us-gaap Profit Loss
ProfitLoss
1573000000 USD
CY2018 us-gaap Profit Loss
ProfitLoss
1174000000 USD
CY2020 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
1000000 USD
CY2019 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
-1000000 USD
CY2018 us-gaap Income Loss From Discontinued Operations Net Of Tax
IncomeLossFromDiscontinuedOperationsNetOfTax
74000000 USD
CY2020 aon Gain Loss On Saleof Business And Investments Net
GainLossOnSaleofBusinessAndInvestmentsNet
25000000 USD
CY2019 aon Gain Loss On Saleof Business And Investments Net
GainLossOnSaleofBusinessAndInvestmentsNet
13000000 USD
CY2018 aon Gain Loss On Saleof Business And Investments Net
GainLossOnSaleofBusinessAndInvestmentsNet
-6000000 USD
CY2020 us-gaap Depreciation
Depreciation
167000000 USD
CY2019 us-gaap Depreciation
Depreciation
172000000 USD
CY2018 us-gaap Depreciation
Depreciation
176000000 USD
CY2020 us-gaap Adjustment For Amortization
AdjustmentForAmortization
246000000 USD
CY2019 us-gaap Adjustment For Amortization
AdjustmentForAmortization
392000000 USD
CY2018 us-gaap Adjustment For Amortization
AdjustmentForAmortization
593000000 USD
CY2020 us-gaap Share Based Compensation
ShareBasedCompensation
312000000 USD
CY2019 us-gaap Share Based Compensation
ShareBasedCompensation
317000000 USD
CY2018 us-gaap Share Based Compensation
ShareBasedCompensation
338000000 USD
CY2020 us-gaap Deferred Income Taxes And Tax Credits
DeferredIncomeTaxesAndTaxCredits
9000000 USD
CY2019 us-gaap Deferred Income Taxes And Tax Credits
DeferredIncomeTaxesAndTaxCredits
-36000000 USD
CY2018 us-gaap Deferred Income Taxes And Tax Credits
DeferredIncomeTaxesAndTaxCredits
-225000000 USD
CY2020 aon Increase Decrease In Fiduciary Receivables
IncreaseDecreaseInFiduciaryReceivables
1140000000 USD
CY2019 aon Increase Decrease In Fiduciary Receivables
IncreaseDecreaseInFiduciaryReceivables
409000000 USD
CY2018 aon Increase Decrease In Fiduciary Receivables
IncreaseDecreaseInFiduciaryReceivables
679000000 USD
CY2020 us-gaap Increase Decrease In Client Funds Held
IncreaseDecreaseInClientFundsHeld
316000000 USD
CY2019 us-gaap Increase Decrease In Client Funds Held
IncreaseDecreaseInClientFundsHeld
1246000000 USD
CY2018 us-gaap Increase Decrease In Client Funds Held
IncreaseDecreaseInClientFundsHeld
320000000 USD
CY2020 aon Increase Decrease In Fiduciary Liabilities
IncreaseDecreaseInFiduciaryLiabilities
1456000000 USD
CY2019 aon Increase Decrease In Fiduciary Liabilities
IncreaseDecreaseInFiduciaryLiabilities
1655000000 USD
CY2018 aon Increase Decrease In Fiduciary Liabilities
IncreaseDecreaseInFiduciaryLiabilities
999000000 USD
CY2020 us-gaap Increase Decrease In Receivables
IncreaseDecreaseInReceivables
-108000000 USD
CY2019 us-gaap Increase Decrease In Receivables
IncreaseDecreaseInReceivables
371000000 USD
CY2018 us-gaap Increase Decrease In Receivables
IncreaseDecreaseInReceivables
127000000 USD
CY2020 us-gaap Increase Decrease In Accounts Payable And Accrued Liabilities
IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
186000000 USD
CY2019 us-gaap Increase Decrease In Accounts Payable And Accrued Liabilities
IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
-28000000 USD
CY2018 us-gaap Increase Decrease In Accounts Payable And Accrued Liabilities
IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
25000000 USD
CY2020 us-gaap Increase Decrease In Restructuring Reserve
IncreaseDecreaseInRestructuringReserve
-127000000 USD
CY2019 us-gaap Increase Decrease In Restructuring Reserve
IncreaseDecreaseInRestructuringReserve
3000000 USD
CY2018 us-gaap Increase Decrease In Restructuring Reserve
IncreaseDecreaseInRestructuringReserve
23000000 USD
CY2020 us-gaap Increase Decrease In Accrued Income Taxes Payable
IncreaseDecreaseInAccruedIncomeTaxesPayable
-17000000 USD
CY2019 us-gaap Increase Decrease In Accrued Income Taxes Payable
IncreaseDecreaseInAccruedIncomeTaxesPayable
-20000000 USD
CY2018 us-gaap Increase Decrease In Accrued Income Taxes Payable
IncreaseDecreaseInAccruedIncomeTaxesPayable
34000000 USD
CY2020 us-gaap Increase Decrease In Pension And Postretirement Obligations
IncreaseDecreaseInPensionAndPostretirementObligations
-141000000 USD
CY2019 us-gaap Increase Decrease In Pension And Postretirement Obligations
IncreaseDecreaseInPensionAndPostretirementObligations
-156000000 USD
CY2018 us-gaap Increase Decrease In Pension And Postretirement Obligations
IncreaseDecreaseInPensionAndPostretirementObligations
-259000000 USD
CY2020 us-gaap Increase Decrease In Other Operating Capital Net
IncreaseDecreaseInOtherOperatingCapitalNet
-48000000 USD
CY2019 us-gaap Increase Decrease In Other Operating Capital Net
IncreaseDecreaseInOtherOperatingCapitalNet
-1000000 USD
CY2018 us-gaap Increase Decrease In Other Operating Capital Net
IncreaseDecreaseInOtherOperatingCapitalNet
-2000000 USD
CY2020 us-gaap Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
2783000000 USD
CY2019 us-gaap Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
1835000000 USD
CY2018 us-gaap Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
1686000000 USD
CY2020 us-gaap Proceeds From Sale And Maturity Of Other Investments
ProceedsFromSaleAndMaturityOfOtherInvestments
64000000 USD
CY2019 us-gaap Proceeds From Sale And Maturity Of Other Investments
ProceedsFromSaleAndMaturityOfOtherInvestments
61000000 USD
CY2018 us-gaap Proceeds From Sale And Maturity Of Other Investments
ProceedsFromSaleAndMaturityOfOtherInvestments
71000000 USD
CY2020 us-gaap Payments To Acquire Other Investments
PaymentsToAcquireOtherInvestments
97000000 USD
CY2019 us-gaap Payments To Acquire Other Investments
PaymentsToAcquireOtherInvestments
113000000 USD
CY2018 us-gaap Payments To Acquire Other Investments
PaymentsToAcquireOtherInvestments
80000000 USD
CY2020 aon Payments For Proceeds From Marketable Securities
PaymentsForProceedsFromMarketableSecurities
167000000 USD
CY2019 aon Payments For Proceeds From Marketable Securities
PaymentsForProceedsFromMarketableSecurities
-35000000 USD
CY2018 aon Payments For Proceeds From Marketable Securities
PaymentsForProceedsFromMarketableSecurities
-348000000 USD
CY2020 us-gaap Payments To Acquire Businesses Net Of Cash Acquired
PaymentsToAcquireBusinessesNetOfCashAcquired
368000000 USD
CY2019 us-gaap Payments To Acquire Businesses Net Of Cash Acquired
PaymentsToAcquireBusinessesNetOfCashAcquired
39000000 USD
CY2018 us-gaap Payments To Acquire Businesses Net Of Cash Acquired
PaymentsToAcquireBusinessesNetOfCashAcquired
58000000 USD
CY2020 us-gaap Proceeds From Divestiture Of Businesses Net Of Cash Divested
ProceedsFromDivestitureOfBusinessesNetOfCashDivested
30000000 USD
CY2019 us-gaap Proceeds From Divestiture Of Businesses Net Of Cash Divested
ProceedsFromDivestitureOfBusinessesNetOfCashDivested
52000000 USD
CY2018 us-gaap Proceeds From Divestiture Of Businesses Net Of Cash Divested
ProceedsFromDivestitureOfBusinessesNetOfCashDivested
-10000000 USD
CY2020 us-gaap Payments To Acquire Property Plant And Equipment
PaymentsToAcquirePropertyPlantAndEquipment
141000000 USD
CY2019 us-gaap Payments To Acquire Property Plant And Equipment
PaymentsToAcquirePropertyPlantAndEquipment
225000000 USD
CY2018 us-gaap Payments To Acquire Property Plant And Equipment
PaymentsToAcquirePropertyPlantAndEquipment
240000000 USD
CY2020 us-gaap Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
-679000000 USD
CY2019 us-gaap Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
-229000000 USD
CY2018 us-gaap Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
31000000 USD
CY2020 us-gaap Payments For Repurchase Of Equity
PaymentsForRepurchaseOfEquity
1763000000 USD
CY2019 us-gaap Payments For Repurchase Of Equity
PaymentsForRepurchaseOfEquity
1960000000 USD
CY2018 us-gaap Payments For Repurchase Of Equity
PaymentsForRepurchaseOfEquity
1470000000 USD
CY2020 us-gaap Payments Related To Tax Withholding For Share Based Compensation
PaymentsRelatedToTaxWithholdingForShareBasedCompensation
149000000 USD
CY2019 us-gaap Payments Related To Tax Withholding For Share Based Compensation
PaymentsRelatedToTaxWithholdingForShareBasedCompensation
131000000 USD
CY2018 us-gaap Payments Related To Tax Withholding For Share Based Compensation
PaymentsRelatedToTaxWithholdingForShareBasedCompensation
149000000 USD
CY2020 us-gaap Proceeds From Issuance Of Long Term Debt
ProceedsFromIssuanceOfLongTermDebt
4153000000 USD
CY2019 us-gaap Proceeds From Issuance Of Long Term Debt
ProceedsFromIssuanceOfLongTermDebt
6052000000 USD
CY2018 us-gaap Proceeds From Issuance Of Long Term Debt
ProceedsFromIssuanceOfLongTermDebt
5754000000 USD
CY2020 us-gaap Repayments Of Long Term Debt
RepaymentsOfLongTermDebt
3882000000 USD
CY2019 us-gaap Repayments Of Long Term Debt
RepaymentsOfLongTermDebt
4941000000 USD
CY2018 us-gaap Repayments Of Long Term Debt
RepaymentsOfLongTermDebt
5417000000 USD
CY2020 us-gaap Payments Of Dividends Common Stock
PaymentsOfDividendsCommonStock
412000000 USD
CY2019 us-gaap Payments Of Dividends Common Stock
PaymentsOfDividendsCommonStock
410000000 USD
CY2018 us-gaap Payments Of Dividends Common Stock
PaymentsOfDividendsCommonStock
382000000 USD
CY2020 us-gaap Payments To Minority Shareholders
PaymentsToMinorityShareholders
35000000 USD
CY2019 us-gaap Payments To Minority Shareholders
PaymentsToMinorityShareholders
103000000 USD
CY2018 us-gaap Payments To Minority Shareholders
PaymentsToMinorityShareholders
35000000 USD
CY2020 us-gaap Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
-2088000000 USD
CY2019 us-gaap Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
-1493000000 USD
CY2018 us-gaap Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
-1699000000 USD
CY2020 us-gaap Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
78000000 USD
CY2019 us-gaap Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
21000000 USD
CY2018 us-gaap Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
-118000000 USD
CY2020 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
94000000 USD
CY2019 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
134000000 USD
CY2018 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
-100000000 USD
CY2019Q4 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
790000000 USD
CY2018Q4 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
656000000 USD
CY2017Q4 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
756000000 USD
CY2020Q4 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
884000000 USD
CY2019Q4 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
790000000 USD
CY2018Q4 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
656000000 USD
CY2020 us-gaap Interest Paid Net
InterestPaidNet
326000000 USD
CY2019 us-gaap Interest Paid Net
InterestPaidNet
289000000 USD
CY2018 us-gaap Interest Paid Net
InterestPaidNet
266000000 USD
CY2020 us-gaap Income Taxes Paid Net
IncomeTaxesPaidNet
455000000 USD
CY2019 us-gaap Income Taxes Paid Net
IncomeTaxesPaidNet
353000000 USD
CY2018 us-gaap Income Taxes Paid Net
IncomeTaxesPaidNet
337000000 USD
CY2020Q2 aon Common Stock Exchange Ratio Related To Reorganization
CommonStockExchangeRatioRelatedToReorganization
1
CY2020 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, foreign currency exchange rate movements, and, recently, impacts from the COVID-19 pandemic 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>
CY2020Q4 aon Cashand Cash Equivalentsand Short Term Investments
CashandCashEquivalentsandShortTermInvestments
1192000000 USD
CY2019Q4 aon Cashand Cash Equivalentsand Short Term Investments
CashandCashEquivalentsandShortTermInvestments
928000000 USD
CY2020Q4 us-gaap Restricted Cash And Investments Current
RestrictedCashAndInvestmentsCurrent
102000000 USD
CY2019Q4 us-gaap Restricted Cash And Investments Current
RestrictedCashAndInvestmentsCurrent
110000000 USD
CY2020Q4 aon Restricted Cash Operating Funds
RestrictedCashOperatingFunds
44400000 GBP
CY2020Q4 aon Restricted Cash Operating Funds
RestrictedCashOperatingFunds
60200000 USD
CY2019Q4 aon Restricted Cash Operating Funds
RestrictedCashOperatingFunds
42700000 GBP
CY2019Q4 aon Restricted Cash Operating Funds
RestrictedCashOperatingFunds
55500000 USD
CY2020Q4 aon Fiduciary Assets Premium Trust Balances
FiduciaryAssetsPremiumTrustBalances
5700000000 USD
CY2020Q4 us-gaap Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
98000000 USD
CY2019Q4 aon Fiduciary Assets Premium Trust Balances
FiduciaryAssetsPremiumTrustBalances
5200000000 USD
CY2019Q4 us-gaap Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
70000000 USD
CY2020 us-gaap Revenue From Contract With Customer Excluding Assessed Tax
RevenueFromContractWithCustomerExcludingAssessedTax
11066000000 USD
CY2019 us-gaap Revenue From Contract With Customer Excluding Assessed Tax
RevenueFromContractWithCustomerExcludingAssessedTax
11013000000 USD
CY2018 us-gaap Revenue From Contract With Customer Excluding Assessed Tax
RevenueFromContractWithCustomerExcludingAssessedTax
10770000000 USD
CY2020 us-gaap Revenue From Contract With Customer Excluding Assessed Tax
RevenueFromContractWithCustomerExcludingAssessedTax
11066000000 USD
CY2019 us-gaap Revenue From Contract With Customer Excluding Assessed Tax
RevenueFromContractWithCustomerExcludingAssessedTax
11013000000 USD
CY2018 us-gaap Revenue From Contract With Customer Excluding Assessed Tax
RevenueFromContractWithCustomerExcludingAssessedTax
10770000000 USD
CY2020 us-gaap Foreign Currency Transaction Gain Loss Before Tax
ForeignCurrencyTransactionGainLossBeforeTax
-12000000 USD
CY2019 us-gaap Foreign Currency Transaction Gain Loss Before Tax
ForeignCurrencyTransactionGainLossBeforeTax
9000000 USD
CY2018 us-gaap Foreign Currency Transaction Gain Loss Before Tax
ForeignCurrencyTransactionGainLossBeforeTax
25000000 USD
CY2020 us-gaap Disposal Group Not Discontinued Operation Gain Loss On Disposal
DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
25000000 USD
CY2019 us-gaap Disposal Group Not Discontinued Operation Gain Loss On Disposal
DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
13000000 USD
CY2018 us-gaap Disposal Group Not Discontinued Operation Gain Loss On Disposal
DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
-6000000 USD
CY2020 us-gaap Pension Expense
PensionExpense
-13000000 USD
CY2019 us-gaap Pension Expense
PensionExpense
-9000000 USD
CY2018 us-gaap Pension Expense
PensionExpense
-1000000 USD
CY2020 us-gaap Income Loss From Equity Method Investments
IncomeLossFromEquityMethodInvestments
4000000 USD
CY2019 us-gaap Income Loss From Equity Method Investments
IncomeLossFromEquityMethodInvestments
4000000 USD
CY2018 us-gaap Income Loss From Equity Method Investments
IncomeLossFromEquityMethodInvestments
4000000 USD
CY2020 us-gaap Gains Losses On Extinguishment Of Debt
GainsLossesOnExtinguishmentOfDebt
-7000000 USD
CY2019 us-gaap Gains Losses On Extinguishment Of Debt
GainsLossesOnExtinguishmentOfDebt
0 USD
CY2018 us-gaap Gains Losses On Extinguishment Of Debt
GainsLossesOnExtinguishmentOfDebt
0 USD
CY2020 us-gaap Derivative Gain Loss On Derivative Net
DerivativeGainLossOnDerivativeNet
-11000000 USD
CY2019 us-gaap Derivative Gain Loss On Derivative Net
DerivativeGainLossOnDerivativeNet
-34000000 USD
CY2018 us-gaap Derivative Gain Loss On Derivative Net
DerivativeGainLossOnDerivativeNet
-49000000 USD
CY2020 us-gaap Nonoperating Income Expense
NonoperatingIncomeExpense
12000000 USD
CY2019 us-gaap Nonoperating Income Expense
NonoperatingIncomeExpense
1000000 USD
CY2018 us-gaap Nonoperating Income Expense
NonoperatingIncomeExpense
-25000000 USD
CY2019Q4 us-gaap Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
70000000 USD
CY2018Q4 us-gaap Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
62000000 USD
CY2017Q4 us-gaap Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
59000000 USD
CY2020 us-gaap Provision For Doubtful Accounts
ProvisionForDoubtfulAccounts
29000000 USD
CY2019 us-gaap Provision For Doubtful Accounts
ProvisionForDoubtfulAccounts
27000000 USD
CY2018 us-gaap Provision For Doubtful Accounts
ProvisionForDoubtfulAccounts
24000000 USD
CY2020 us-gaap Allowance For Doubtful Accounts Receivable Write Offs
AllowanceForDoubtfulAccountsReceivableWriteOffs
6000000 USD
CY2019 us-gaap Allowance For Doubtful Accounts Receivable Write Offs
AllowanceForDoubtfulAccountsReceivableWriteOffs
19000000 USD
CY2018 us-gaap Allowance For Doubtful Accounts Receivable Write Offs
AllowanceForDoubtfulAccountsReceivableWriteOffs
25000000 USD
CY2020 aon Accounts Receivable Allowance For Credit Loss Foreign Currency Translation And Other
AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther
-2000000 USD
CY2019 aon Accounts Receivable Allowance For Credit Loss Foreign Currency Translation And Other
AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther
0 USD
CY2018 aon Accounts Receivable Allowance For Credit Loss Foreign Currency Translation And Other
AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther
4000000 USD
CY2020Q4 us-gaap Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
98000000 USD
CY2019Q4 us-gaap Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
70000000 USD
CY2018Q4 us-gaap Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
62000000 USD
CY2020Q4 us-gaap Contract With Customer Asset Net Current
ContractWithCustomerAssetNetCurrent
339000000 USD
CY2019Q4 us-gaap Contract With Customer Asset Net Current
ContractWithCustomerAssetNetCurrent
335000000 USD
CY2020Q4 aon Other Tax Assets Current
OtherTaxAssetsCurrent
95000000 USD
CY2019Q4 aon Other Tax Assets Current
OtherTaxAssetsCurrent
88000000 USD
CY2020Q4 us-gaap Prepaid Expense Current
PrepaidExpenseCurrent
111000000 USD
CY2019Q4 us-gaap Prepaid Expense Current
PrepaidExpenseCurrent
97000000 USD
CY2020Q4 us-gaap Other Assets Miscellaneous Current
OtherAssetsMiscellaneousCurrent
79000000 USD
CY2019Q4 us-gaap Other Assets Miscellaneous Current
OtherAssetsMiscellaneousCurrent
82000000 USD
CY2020Q4 us-gaap Other Assets Current
OtherAssetsCurrent
624000000 USD
CY2019Q4 us-gaap Other Assets Current
OtherAssetsCurrent
602000000 USD
CY2019Q4 us-gaap Disposal Group Including Discontinued Operation Accounts Notes And Loans Receivable Net
DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet
4000000 USD
CY2020Q4 us-gaap Property Plant And Equipment Gross
PropertyPlantAndEquipmentGross
1867000000 USD
CY2019Q4 us-gaap Property Plant And Equipment Gross
PropertyPlantAndEquipmentGross
1780000000 USD
CY2020Q4 us-gaap Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
1268000000 USD
CY2019Q4 us-gaap Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
1159000000 USD
CY2020Q4 us-gaap Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
599000000 USD
CY2019Q4 us-gaap Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
621000000 USD
CY2020 us-gaap Depreciation
Depreciation
167000000 USD
CY2019 us-gaap Depreciation
Depreciation
172000000 USD
CY2018 us-gaap Depreciation
Depreciation
176000000 USD
CY2020Q4 us-gaap Contract With Customer Asset Net Noncurrent
ContractWithCustomerAssetNetNoncurrent
184000000 USD
CY2019Q4 us-gaap Contract With Customer Asset Net Noncurrent
ContractWithCustomerAssetNetNoncurrent
171000000 USD
CY2020Q4 us-gaap Long Term Investments
LongTermInvestments
74000000 USD
CY2019Q4 us-gaap Long Term Investments
LongTermInvestments
53000000 USD
CY2020Q4 us-gaap Finance Lease Right Of Use Asset
FinanceLeaseRightOfUseAsset
89000000 USD
CY2019Q4 us-gaap Finance Lease Right Of Use Asset
FinanceLeaseRightOfUseAsset
100000000 USD
CY2020Q4 us-gaap Income Taxes Receivable Noncurrent
IncomeTaxesReceivableNoncurrent
125000000 USD
CY2019Q4 us-gaap Income Taxes Receivable Noncurrent
IncomeTaxesReceivableNoncurrent
102000000 USD
CY2020Q4 us-gaap Other Assets Miscellaneous Noncurrent
OtherAssetsMiscellaneousNoncurrent
138000000 USD
CY2019Q4 us-gaap Other Assets Miscellaneous Noncurrent
OtherAssetsMiscellaneousNoncurrent
144000000 USD
CY2020Q4 us-gaap Other Assets Noncurrent
OtherAssetsNoncurrent
610000000 USD
CY2019Q4 us-gaap Other Assets Noncurrent
OtherAssetsNoncurrent
570000000 USD
CY2020Q4 us-gaap Contract With Customer Liability Current
ContractWithCustomerLiabilityCurrent
296000000 USD
CY2019Q4 us-gaap Contract With Customer Liability Current
ContractWithCustomerLiabilityCurrent
270000000 USD
CY2020Q4 us-gaap Accrued Income Taxes Current
AccruedIncomeTaxesCurrent
80000000 USD
CY2019Q4 us-gaap Accrued Income Taxes Current
AccruedIncomeTaxesCurrent
93000000 USD
CY2020Q4 aon Operating Lease And Finance Lease Liability Current
OperatingLeaseAndFinanceLeaseLiabilityCurrent
234000000 USD
CY2019Q4 aon Operating Lease And Finance Lease Liability Current
OperatingLeaseAndFinanceLeaseLiabilityCurrent
210000000 USD
CY2020Q4 us-gaap Other Accrued Liabilities Current
OtherAccruedLiabilitiesCurrent
561000000 USD
CY2019Q4 us-gaap Other Accrued Liabilities Current
OtherAccruedLiabilitiesCurrent
513000000 USD
CY2020Q4 us-gaap Other Liabilities Current
OtherLiabilitiesCurrent
1171000000 USD
CY2019Q4 us-gaap Other Liabilities Current
OtherLiabilitiesCurrent
1086000000 USD
CY2020 aon Contract With Customer Liability Including New Contract Revenue Recognized
ContractWithCustomerLiabilityIncludingNewContractRevenueRecognized
454000000 USD
CY2019 aon Contract With Customer Liability Including New Contract Revenue Recognized
ContractWithCustomerLiabilityIncludingNewContractRevenueRecognized
532000000 USD
CY2020Q4 us-gaap Accrued Income Taxes Noncurrent
AccruedIncomeTaxesNoncurrent
561000000 USD
CY2019Q4 us-gaap Accrued Income Taxes Noncurrent
AccruedIncomeTaxesNoncurrent
525000000 USD
CY2020Q4 us-gaap Finance Lease Liability Noncurrent
FinanceLeaseLiabilityNoncurrent
65000000 USD
CY2019Q4 us-gaap Finance Lease Liability Noncurrent
FinanceLeaseLiabilityNoncurrent
76000000 USD
CY2020Q4 aon Employeerelated Liabilities Noncurrent
EmployeerelatedLiabilitiesNoncurrent
53000000 USD
CY2019Q4 aon Employeerelated Liabilities Noncurrent
EmployeerelatedLiabilitiesNoncurrent
49000000 USD
CY2020Q4 us-gaap Contract With Customer Liability Noncurrent
ContractWithCustomerLiabilityNoncurrent
76000000 USD
CY2019Q4 us-gaap Contract With Customer Liability Noncurrent
ContractWithCustomerLiabilityNoncurrent
62000000 USD
CY2020Q4 us-gaap Other Accrued Liabilities Noncurrent
OtherAccruedLiabilitiesNoncurrent
140000000 USD
CY2019Q4 us-gaap Other Accrued Liabilities Noncurrent
OtherAccruedLiabilitiesNoncurrent
165000000 USD
CY2020Q4 us-gaap Other Liabilities Noncurrent
OtherLiabilitiesNoncurrent
895000000 USD
CY2019Q4 us-gaap Other Liabilities Noncurrent
OtherLiabilitiesNoncurrent
877000000 USD
CY2019Q4 us-gaap Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Liability Noncurrent
TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiabilityNoncurrent
145000000 USD
CY2020Q4 us-gaap Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Liability Noncurrent
TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiabilityNoncurrent
145000000 USD
CY2020 us-gaap Restructuring Charges
RestructuringCharges
0 USD
CY2019 us-gaap Restructuring Charges
RestructuringCharges
451000000 USD
CY2018 us-gaap Restructuring Charges
RestructuringCharges
485000000 USD
CY2019Q4 us-gaap Restructuring Reserve
RestructuringReserve
204000000 USD
CY2020 us-gaap Payments For Restructuring
PaymentsForRestructuring
127000000 USD
CY2020 us-gaap Restructuring Reserve Translation Adjustment
RestructuringReserveTranslationAdjustment
32000000 USD
CY2020Q4 us-gaap Restructuring Reserve
RestructuringReserve
45000000 USD
CY2020 us-gaap Number Of Businesses Acquired
NumberOfBusinessesAcquired
6 numberOfAcquisition
CY2019 us-gaap Number Of Businesses Acquired
NumberOfBusinessesAcquired
3 numberOfAcquisition
CY2020Q4 us-gaap Finance Lease Right Of Use Asset
FinanceLeaseRightOfUseAsset
89000000 USD
CY2019Q4 us-gaap Finance Lease Right Of Use Asset
FinanceLeaseRightOfUseAsset
100000000 USD
CY2020 us-gaap Acquired Finite Lived Intangible Assets Weighted Average Useful Life
AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
P6Y
CY2020 us-gaap Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual
BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
44000000 USD
CY2020 us-gaap Disposal Group Not Discontinued Operation Gain Loss On Disposal
DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
25000000 USD
CY2019 us-gaap Disposal Group Not Discontinued Operation Gain Loss On Disposal
DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
13000000 USD
CY2018 us-gaap Disposal Group Not Discontinued Operation Gain Loss On Disposal
DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
-6000000 USD
CY2018Q4 us-gaap Goodwill
Goodwill
8171000000 USD
CY2019 us-gaap Goodwill Acquired During Period
GoodwillAcquiredDuringPeriod
34000000 USD
CY2019 us-gaap Goodwill Written Off Related To Sale Of Business Unit
GoodwillWrittenOffRelatedToSaleOfBusinessUnit
11000000 USD
CY2019 us-gaap Goodwill Purchase Accounting Adjustments
GoodwillPurchaseAccountingAdjustments
2000000 USD
CY2019 us-gaap Goodwill Foreign Currency Translation Gain Loss
GoodwillForeignCurrencyTranslationGainLoss
-31000000 USD
CY2019Q4 us-gaap Goodwill
Goodwill
8165000000 USD
CY2020 us-gaap Goodwill Acquired During Period
GoodwillAcquiredDuringPeriod
314000000 USD
CY2020 us-gaap Goodwill Written Off Related To Sale Of Business Unit
GoodwillWrittenOffRelatedToSaleOfBusinessUnit
3000000 USD
CY2020 us-gaap Goodwill Foreign Currency Translation Gain Loss
GoodwillForeignCurrencyTranslationGainLoss
190000000 USD
CY2020Q4 us-gaap Goodwill
Goodwill
8666000000 USD
CY2020Q4 us-gaap Finite Lived Intangible Assets Gross
FiniteLivedIntangibleAssetsGross
2786000000 USD
CY2020Q4 us-gaap Finite Lived Intangible Assets Accumulated Amortization
FiniteLivedIntangibleAssetsAccumulatedAmortization
2146000000 USD
CY2020Q4 us-gaap Intangible Assets Net Excluding Goodwill
IntangibleAssetsNetExcludingGoodwill
640000000 USD
CY2019Q4 us-gaap Finite Lived Intangible Assets Gross
FiniteLivedIntangibleAssetsGross
3673000000 USD
CY2019Q4 us-gaap Finite Lived Intangible Assets Accumulated Amortization
FiniteLivedIntangibleAssetsAccumulatedAmortization
2890000000 USD
CY2019Q4 us-gaap Intangible Assets Net Excluding Goodwill
IntangibleAssetsNetExcludingGoodwill
783000000 USD
CY2020 aon Amortization And Impairment Of Intangible Assets
AmortizationAndImpairmentOfIntangibleAssets
246000000 USD
CY2019 aon Amortization And Impairment Of Intangible Assets
AmortizationAndImpairmentOfIntangibleAssets
392000000 USD
CY2018 aon Amortization And Impairment Of Intangible Assets
AmortizationAndImpairmentOfIntangibleAssets
593000000 USD
CY2020Q4 us-gaap Finite Lived Intangible Assets Amortization Expense Next Twelve Months
FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
144000000 USD
CY2020Q4 us-gaap Finite Lived Intangible Assets Amortization Expense Year Two
FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
102000000 USD
CY2020Q4 us-gaap Finite Lived Intangible Assets Amortization Expense Year Three
FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
91000000 USD
CY2020Q4 us-gaap Finite Lived Intangible Assets Amortization Expense Year Four
FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
73000000 USD
CY2020Q4 us-gaap Finite Lived Intangible Assets Amortization Expense Year Five
FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
59000000 USD
CY2020Q4 us-gaap Finite Lived Intangible Assets Amortization Expense After Year Five
FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
171000000 USD
CY2020Q4 us-gaap Finite Lived Intangible Assets Net
FiniteLivedIntangibleAssetsNet
640000000 USD
CY2020Q4 us-gaap Debt Longterm And Shortterm Combined Amount
DebtLongtermAndShorttermCombinedAmount
7729000000 USD
CY2019Q4 us-gaap Debt Longterm And Shortterm Combined Amount
DebtLongtermAndShorttermCombinedAmount
7339000000 USD
CY2020Q4 us-gaap Debt Current
DebtCurrent
448000000 USD
CY2019Q4 us-gaap Debt Current
DebtCurrent
712000000 USD
CY2020Q4 us-gaap Long Term Debt Noncurrent
LongTermDebtNoncurrent
7281000000 USD
CY2019Q4 us-gaap Long Term Debt Noncurrent
LongTermDebtNoncurrent
6627000000 USD
CY2020Q4 us-gaap Long Term Debt Maturities Repayments Of Principal In Next Twelve Months
LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
448000000 USD
CY2020Q4 us-gaap Long Term Debt Maturities Repayments Of Principal In Year Two
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
500000000 USD
CY2020Q4 us-gaap Long Term Debt Maturities Repayments Of Principal In Year Three
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
350000000 USD
CY2020Q4 us-gaap Long Term Debt Maturities Repayments Of Principal In Year Four
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
600000000 USD
CY2020Q4 us-gaap Long Term Debt Maturities Repayments Of Principal In Year Five
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
750000000 USD
CY2020Q4 us-gaap Long Term Debt Maturities Repayments Of Principal After Year Five
LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
5187000000 USD
CY2020Q4 us-gaap Debt Instrument Carrying Amount
DebtInstrumentCarryingAmount
7835000000 USD
CY2020 aon Noncashpaymentoflongtermdebtnet
Noncashpaymentoflongtermdebtnet
106000000 USD
CY2020Q4 us-gaap Long Term Debt
LongTermDebt
7729000000 USD
CY2020 aon Number Of Credit Facilities
NumberOfCreditFacilities
2 credit_facility
CY2020 aon Number Of Credit Facilities
NumberOfCreditFacilities
2 credit_facility
CY2020Q4 us-gaap Operating Lease Right Of Use Asset
OperatingLeaseRightOfUseAsset
911000000 USD
CY2019Q4 us-gaap Operating Lease Right Of Use Asset
OperatingLeaseRightOfUseAsset
929000000 USD
CY2020Q4 aon Operating Lease And Finance Lease Rightof Use Asset
OperatingLeaseAndFinanceLeaseRightofUseAsset
1000000000 USD
CY2019Q4 aon Operating Lease And Finance Lease Rightof Use Asset
OperatingLeaseAndFinanceLeaseRightofUseAsset
1029000000 USD
CY2020Q4 us-gaap Operating Lease Liability Current
OperatingLeaseLiabilityCurrent
204000000 USD
CY2019Q4 us-gaap Operating Lease Liability Current
OperatingLeaseLiabilityCurrent
186000000 USD
CY2020Q4 us-gaap Finance Lease Liability Current
FinanceLeaseLiabilityCurrent
30000000 USD
CY2019Q4 us-gaap Finance Lease Liability Current
FinanceLeaseLiabilityCurrent
24000000 USD
CY2020Q4 us-gaap Operating Lease Liability Noncurrent
OperatingLeaseLiabilityNoncurrent
897000000 USD
CY2019Q4 us-gaap Operating Lease Liability Noncurrent
OperatingLeaseLiabilityNoncurrent
944000000 USD
CY2020Q4 us-gaap Finance Lease Liability Noncurrent
FinanceLeaseLiabilityNoncurrent
65000000 USD
CY2019Q4 us-gaap Finance Lease Liability Noncurrent
FinanceLeaseLiabilityNoncurrent
76000000 USD
CY2020Q4 aon Operating And Finance Lease Liability
OperatingAndFinanceLeaseLiability
1196000000 USD
CY2019Q4 aon Operating And Finance Lease Liability
OperatingAndFinanceLeaseLiability
1230000000 USD
CY2020 us-gaap Operating Lease Cost
OperatingLeaseCost
221000000 USD
CY2019 us-gaap Operating Lease Cost
OperatingLeaseCost
234000000 USD
CY2020 us-gaap Finance Lease Right Of Use Asset Amortization
FinanceLeaseRightOfUseAssetAmortization
25000000 USD
CY2019 us-gaap Finance Lease Right Of Use Asset Amortization
FinanceLeaseRightOfUseAssetAmortization
26000000 USD
CY2020 us-gaap Finance Lease Interest Expense
FinanceLeaseInterestExpense
3000000 USD
CY2019 us-gaap Finance Lease Interest Expense
FinanceLeaseInterestExpense
2000000 USD
CY2020 us-gaap Variable Lease Cost
VariableLeaseCost
48000000 USD
CY2019 us-gaap Variable Lease Cost
VariableLeaseCost
60000000 USD
CY2020 us-gaap Short Term Lease Cost
ShortTermLeaseCost
10000000 USD
CY2019 us-gaap Short Term Lease Cost
ShortTermLeaseCost
5000000 USD
CY2020 us-gaap Sublease Income
SubleaseIncome
32000000 USD
CY2019 us-gaap Sublease Income
SubleaseIncome
32000000 USD
CY2020 us-gaap Lease Cost
LeaseCost
275000000 USD
CY2019 us-gaap Lease Cost
LeaseCost
295000000 USD
CY2020Q4 us-gaap Operating Lease Weighted Average Remaining Lease Term1
OperatingLeaseWeightedAverageRemainingLeaseTerm1
P7Y4M24D
CY2019Q4 us-gaap Operating Lease Weighted Average Remaining Lease Term1
OperatingLeaseWeightedAverageRemainingLeaseTerm1
P7Y10M24D
CY2020Q4 us-gaap Finance Lease Weighted Average Remaining Lease Term1
FinanceLeaseWeightedAverageRemainingLeaseTerm1
P4Y2M12D
CY2019Q4 us-gaap Finance Lease Weighted Average Remaining Lease Term1
FinanceLeaseWeightedAverageRemainingLeaseTerm1
P4Y4M24D
CY2020Q4 us-gaap Lessee Operating Lease Discount Rate
LesseeOperatingLeaseDiscountRate
0.029
CY2019Q4 us-gaap Lessee Operating Lease Discount Rate
LesseeOperatingLeaseDiscountRate
0.032
CY2020Q4 us-gaap Lessee Finance Lease Discount Rate
LesseeFinanceLeaseDiscountRate
0.010
CY2019Q4 us-gaap Lessee Finance Lease Discount Rate
LesseeFinanceLeaseDiscountRate
0.020
CY2020 us-gaap Operating Lease Payments
OperatingLeasePayments
236000000 USD
CY2019 us-gaap Operating Lease Payments
OperatingLeasePayments
264000000 USD
CY2020 us-gaap Finance Lease Principal Payments
FinanceLeasePrincipalPayments
12000000 USD
CY2019 us-gaap Finance Lease Principal Payments
FinanceLeasePrincipalPayments
17000000 USD
CY2020 us-gaap Right Of Use Asset Obtained In Exchange For Operating Lease Liability
RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
146000000 USD
CY2019 us-gaap Right Of Use Asset Obtained In Exchange For Operating Lease Liability
RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
155000000 USD
CY2020 us-gaap Right Of Use Asset Obtained In Exchange For Finance Lease Liability
RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability
13000000 USD
CY2019 us-gaap Right Of Use Asset Obtained In Exchange For Finance Lease Liability
RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability
48000000 USD
CY2020 aon Operating Lease Right Of Use Asset Amortization
OperatingLeaseRightOfUseAssetAmortization
178000000 USD
CY2019 aon Operating Lease Right Of Use Asset Amortization
OperatingLeaseRightOfUseAssetAmortization
195000000 USD
CY2020 aon Increase Decrease In Operating Lease Liabilities Noncurrent
IncreaseDecreaseInOperatingLeaseLiabilitiesNoncurrent
-47000000 USD
CY2019 aon Increase Decrease In Operating Lease Liabilities Noncurrent
IncreaseDecreaseInOperatingLeaseLiabilitiesNoncurrent
-70000000 USD
CY2020Q4 us-gaap Finance Lease Liability
FinanceLeaseLiability
95000000 USD
CY2020Q4 us-gaap Lessee Operating Lease Liability Payments Due Next Twelve Months
LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
226000000 USD
CY2020Q4 us-gaap Finance Lease Liability Payments Due Next Twelve Months
FinanceLeaseLiabilityPaymentsDueNextTwelveMonths
31000000 USD
CY2020Q4 aon Finance And Operating Lease Liability Payments Net Of Sublease Income Due Year One
FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearOne
257000000 USD
CY2020Q4 us-gaap Lessee Operating Lease Liability Payments Due Year Two
LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
209000000 USD
CY2020Q4 us-gaap Finance Lease Liability Payments Due Year Two
FinanceLeaseLiabilityPaymentsDueYearTwo
20000000 USD
CY2020Q4 aon Financing And Operating Lease Liability Payments Net Of Sublease Income Due Year Two
FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo
229000000 USD
CY2020Q4 us-gaap Lessee Operating Lease Liability Payments Due Year Three
LesseeOperatingLeaseLiabilityPaymentsDueYearThree
160000000 USD
CY2020Q4 us-gaap Finance Lease Liability Payments Due Year Three
FinanceLeaseLiabilityPaymentsDueYearThree
18000000 USD
CY2020Q4 aon Financing And Operating Lease Liability Payments Net Of Sublease Income Due Year Three
FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree
178000000 USD
CY2020Q4 us-gaap Lessee Operating Lease Liability Payments Due Year Four
LesseeOperatingLeaseLiabilityPaymentsDueYearFour
130000000 USD
CY2020Q4 us-gaap Finance Lease Liability Payments Due Year Four
FinanceLeaseLiabilityPaymentsDueYearFour
18000000 USD
CY2020Q4 aon Financing And Operating Lease Liability Payments Net Of Sublease Income Due Year Four
FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour
148000000 USD
CY2020Q4 us-gaap Lessee Operating Lease Liability Payments Due Year Five
LesseeOperatingLeaseLiabilityPaymentsDueYearFive
110000000 USD
CY2020Q4 us-gaap Finance Lease Liability Payments Due Year Five
FinanceLeaseLiabilityPaymentsDueYearFive
10000000 USD
CY2020Q4 aon Financing And Operating Lease Liability Payments Net Of Sublease Income Due Year Five
FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive
120000000 USD
CY2020Q4 us-gaap Lessee Operating Lease Liability Payments Due After Year Five
LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
382000000 USD
CY2020Q4 us-gaap Finance Lease Liability Payments Due After Year Five
FinanceLeaseLiabilityPaymentsDueAfterYearFive
0 USD
CY2020Q4 aon Financing And Operating Lease Liability Payments Net Of Sublease Income Due After Year Five
FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueAfterYearFive
382000000 USD
CY2020Q4 us-gaap Lessee Operating Lease Liability Payments Due
LesseeOperatingLeaseLiabilityPaymentsDue
1217000000 USD
CY2020Q4 us-gaap Finance Lease Liability Payments Due
FinanceLeaseLiabilityPaymentsDue
97000000 USD
CY2020Q4 aon Financing And Operating Lease Liability Payments Net Of Sublease Income Due
FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDue
1314000000 USD
CY2020Q4 us-gaap Lessee Operating Lease Liability Undiscounted Excess Amount
LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
116000000 USD
CY2020Q4 us-gaap Finance Lease Liability Undiscounted Excess Amount
FinanceLeaseLiabilityUndiscountedExcessAmount
2000000 USD
CY2020Q4 aon Financing And Operating Lease Liability Net Of Sublease Income Undiscounted Excess Amount
FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncomeUndiscountedExcessAmount
118000000 USD
CY2020Q4 us-gaap Operating Lease Liability
OperatingLeaseLiability
1101000000 USD
CY2020Q4 aon Financing And Operating Lease Liability Net Of Sublease Income
FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncome
1196000000 USD
CY2020 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
2465000000 USD
CY2019 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
1871000000 USD
CY2018 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
1246000000 USD
CY2020 us-gaap Current Income Tax Expense Benefit
CurrentIncomeTaxExpenseBenefit
439000000 USD
CY2019 us-gaap Current Income Tax Expense Benefit
CurrentIncomeTaxExpenseBenefit
333000000 USD
CY2018 us-gaap Current Income Tax Expense Benefit
CurrentIncomeTaxExpenseBenefit
371000000 USD
CY2020 us-gaap Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
9000000 USD
CY2019 us-gaap Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
-36000000 USD
CY2018 us-gaap Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
-225000000 USD
CY2020 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
448000000 USD
CY2019 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
297000000 USD
CY2018 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
146000000 USD
CY2020 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.250
CY2019 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.190
CY2019 us-gaap Effective Income Tax Rate Reconciliation State And Local Income Taxes
EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
0.005
CY2018 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.190
CY2020 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.250
CY2019 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.190
CY2018 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.190
CY2020 us-gaap Effective Income Tax Rate Reconciliation State And Local Income Taxes
EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
0.010
CY2018 us-gaap Effective Income Tax Rate Reconciliation State And Local Income Taxes
EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
-0.004
CY2020 us-gaap Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential
EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
-0.098
CY2019 us-gaap Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential
EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
-0.060
CY2018 us-gaap Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential
EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
-0.073
CY2020 us-gaap Effective Income Tax Rate Reconciliation Nondeductible Expense
EffectiveIncomeTaxRateReconciliationNondeductibleExpense
0.021
CY2019 us-gaap Effective Income Tax Rate Reconciliation Nondeductible Expense
EffectiveIncomeTaxRateReconciliationNondeductibleExpense
0.016
CY2018 us-gaap Effective Income Tax Rate Reconciliation Nondeductible Expense
EffectiveIncomeTaxRateReconciliationNondeductibleExpense
0.027
CY2020 us-gaap Effective Income Tax Rate Reconciliation Prior Year Income Taxes
EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
0
CY2019 us-gaap Effective Income Tax Rate Reconciliation Prior Year Income Taxes
EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
0.001
CY2018 us-gaap Effective Income Tax Rate Reconciliation Prior Year Income Taxes
EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
0.009
CY2020 aon Effective Income Tax Rate Reconciliation Deferred Tax Adjustments Including Statutory Rate Changes Percent
EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsIncludingStatutoryRateChangesPercent
0.007
CY2019 aon Effective Income Tax Rate Reconciliation Deferred Tax Adjustments Including Statutory Rate Changes Percent
EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsIncludingStatutoryRateChangesPercent
0
CY2018 aon Effective Income Tax Rate Reconciliation Deferred Tax Adjustments Including Statutory Rate Changes Percent
EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsIncludingStatutoryRateChangesPercent
0
CY2020 us-gaap Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings
EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
0.007
CY2019 us-gaap Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings
EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
0
CY2018 us-gaap Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings
EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
0
CY2020 us-gaap Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance
EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
0
CY2019 us-gaap Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance
EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
0.018
CY2018 us-gaap Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance
EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
0.038
CY2020 us-gaap Effective Income Tax Rate Reconciliation Tax Contingencies
EffectiveIncomeTaxRateReconciliationTaxContingencies
0.015
CY2019 us-gaap Effective Income Tax Rate Reconciliation Tax Contingencies
EffectiveIncomeTaxRateReconciliationTaxContingencies
0.022
CY2018 us-gaap Effective Income Tax Rate Reconciliation Tax Contingencies
EffectiveIncomeTaxRateReconciliationTaxContingencies
0.009
CY2020 us-gaap Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost
EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
0.022
CY2019 us-gaap Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost
EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
0.028
CY2018 us-gaap Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost
EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
0.036
CY2020 us-gaap Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Percent
EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent
0
CY2019 us-gaap Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Percent
EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent
-0.003
CY2018 us-gaap Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Percent
EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent
0.071
CY2020 us-gaap Effective Income Tax Rate Reconciliation Disposition Of Business
EffectiveIncomeTaxRateReconciliationDispositionOfBusiness
0
CY2019 us-gaap Effective Income Tax Rate Reconciliation Disposition Of Business
EffectiveIncomeTaxRateReconciliationDispositionOfBusiness
0
CY2018 us-gaap Effective Income Tax Rate Reconciliation Disposition Of Business
EffectiveIncomeTaxRateReconciliationDispositionOfBusiness
-0.102
CY2020 aon Effective Income Tax Rate Reconciliation Capital Losses Percent
EffectiveIncomeTaxRateReconciliationCapitalLossesPercent
-0.018
CY2019 aon Effective Income Tax Rate Reconciliation Capital Losses Percent
EffectiveIncomeTaxRateReconciliationCapitalLossesPercent
0
CY2018 aon Effective Income Tax Rate Reconciliation Capital Losses Percent
EffectiveIncomeTaxRateReconciliationCapitalLossesPercent
0
CY2020 aon Effective Income Tax Rate Reconciliation Nondeductible Expense Transaction Costs Percent
EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCostsPercent
0.013
CY2019 aon Effective Income Tax Rate Reconciliation Nondeductible Expense Transaction Costs Percent
EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCostsPercent
0
CY2018 aon Effective Income Tax Rate Reconciliation Nondeductible Expense Transaction Costs Percent
EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCostsPercent
0
CY2020 us-gaap Effective Income Tax Rate Reconciliation Other Adjustments
EffectiveIncomeTaxRateReconciliationOtherAdjustments
-0.003
CY2019 us-gaap Effective Income Tax Rate Reconciliation Other Adjustments
EffectiveIncomeTaxRateReconciliationOtherAdjustments
-0.002
CY2018 us-gaap Effective Income Tax Rate Reconciliation Other Adjustments
EffectiveIncomeTaxRateReconciliationOtherAdjustments
-0.012
CY2020 us-gaap Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
0.182
CY2019 us-gaap Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
0.159
CY2018 us-gaap Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
0.117
CY2020 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.250
CY2019 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.190
CY2018 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.190
CY2020Q4 aon Deferred Tax Assets Net Operating And Capital Loss Carryforwards And Tax Credit Carryforwards
DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards
653000000 USD
CY2019Q4 aon Deferred Tax Assets Net Operating And Capital Loss Carryforwards And Tax Credit Carryforwards
DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards
440000000 USD
CY2020Q4 us-gaap Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits
DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
312000000 USD
CY2019Q4 us-gaap Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits
DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
373000000 USD
CY2020Q4 aon Deferred Tax Assets Lease Liability
DeferredTaxAssetsLeaseLiability
248000000 USD
CY2019Q4 aon Deferred Tax Assets Lease Liability
DeferredTaxAssetsLeaseLiability
247000000 USD
CY2020Q4 us-gaap Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other
DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
103000000 USD
CY2019Q4 us-gaap Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other
DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
68000000 USD
CY2020Q4 us-gaap Deferred Tax Assets Deferred Income
DeferredTaxAssetsDeferredIncome
36000000 USD
CY2019Q4 us-gaap Deferred Tax Assets Deferred Income
DeferredTaxAssetsDeferredIncome
24000000 USD
CY2020Q4 us-gaap Deferred Tax Assets Investments
DeferredTaxAssetsInvestments
28000000 USD
CY2019Q4 us-gaap Deferred Tax Assets Investments
DeferredTaxAssetsInvestments
28000000 USD
CY2020Q4 aon Deferred Tax Assets Lease Guarantees
DeferredTaxAssetsLeaseGuarantees
2000000 USD
CY2019Q4 aon Deferred Tax Assets Lease Guarantees
DeferredTaxAssetsLeaseGuarantees
3000000 USD
CY2020Q4 aon Deferred Tax Assets Accrued Interest
DeferredTaxAssetsAccruedInterest
0 USD
CY2019Q4 aon Deferred Tax Assets Accrued Interest
DeferredTaxAssetsAccruedInterest
116000000 USD
CY2020Q4 us-gaap Deferred Tax Liabilities Unrealized Currency Transaction Gains
DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
26000000 USD
CY2020Q4 us-gaap Deferred Tax Assets Other
DeferredTaxAssetsOther
54000000 USD
CY2019Q4 us-gaap Deferred Tax Assets Other
DeferredTaxAssetsOther
57000000 USD
CY2020Q4 us-gaap Deferred Tax Assets Gross
DeferredTaxAssetsGross
1436000000 USD
CY2019Q4 us-gaap Deferred Tax Assets Gross
DeferredTaxAssetsGross
1356000000 USD
CY2020Q4 us-gaap Deferred Tax Assets Valuation Allowance
DeferredTaxAssetsValuationAllowance
205000000 USD
CY2019Q4 us-gaap Deferred Tax Assets Valuation Allowance
DeferredTaxAssetsValuationAllowance
200000000 USD
CY2020Q4 us-gaap Deferred Tax Assets Net
DeferredTaxAssetsNet
1231000000 USD
CY2019Q4 us-gaap Deferred Tax Assets Net
DeferredTaxAssetsNet
1156000000 USD
CY2020Q4 aon Deferred Tax Liabilities Intangible Assets And Property Plant And Equipment
DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment
291000000 USD
CY2019Q4 aon Deferred Tax Liabilities Intangible Assets And Property Plant And Equipment
DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment
251000000 USD
CY2020Q4 aon Deferred Tax Liabilities Lease Rightof Use Asset
DeferredTaxLiabilitiesLeaseRightofUseAsset
211000000 USD
CY2019Q4 aon Deferred Tax Liabilities Lease Rightof Use Asset
DeferredTaxLiabilitiesLeaseRightofUseAsset
219000000 USD
CY2020Q4 us-gaap Deferred Tax Liabilities Tax Deferred Income
DeferredTaxLiabilitiesTaxDeferredIncome
141000000 USD
CY2019Q4 us-gaap Deferred Tax Liabilities Tax Deferred Income
DeferredTaxLiabilitiesTaxDeferredIncome
128000000 USD
CY2020Q4 us-gaap Deferred Tax Liabilities Undistributed Foreign Earnings
DeferredTaxLiabilitiesUndistributedForeignEarnings
37000000 USD
CY2019Q4 us-gaap Deferred Tax Liabilities Undistributed Foreign Earnings
DeferredTaxLiabilitiesUndistributedForeignEarnings
28000000 USD
CY2019Q4 us-gaap Deferred Tax Liabilities Unrealized Currency Transaction Gains
DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
26000000 USD
CY2020Q4 aon Deferred Tax Liabilities Other Accrued Expenses
DeferredTaxLiabilitiesOtherAccruedExpenses
22000000 USD
CY2019Q4 aon Deferred Tax Liabilities Other Accrued Expenses
DeferredTaxLiabilitiesOtherAccruedExpenses
25000000 USD
CY2020Q4 us-gaap Deferred Tax Liabilities Other
DeferredTaxLiabilitiesOther
41000000 USD
CY2019Q4 us-gaap Deferred Tax Liabilities Other
DeferredTaxLiabilitiesOther
33000000 USD
CY2020Q4 us-gaap Deferred Tax Liabilities
DeferredTaxLiabilities
769000000 USD
CY2019Q4 us-gaap Deferred Tax Liabilities
DeferredTaxLiabilities
710000000 USD
CY2020Q4 us-gaap Deferred Tax Assets Liabilities Net
DeferredTaxAssetsLiabilitiesNet
462000000 USD
CY2019Q4 us-gaap Deferred Tax Assets Liabilities Net
DeferredTaxAssetsLiabilitiesNet
446000000 USD
CY2020Q4 us-gaap Deferred Income Tax Assets Net
DeferredIncomeTaxAssetsNet
724000000 USD
CY2019Q4 us-gaap Deferred Income Tax Assets Net
DeferredIncomeTaxAssetsNet
645000000 USD
CY2020Q4 us-gaap Deferred Income Tax Liabilities Net
DeferredIncomeTaxLiabilitiesNet
262000000 USD
CY2019Q4 us-gaap Deferred Income Tax Liabilities Net
DeferredIncomeTaxLiabilitiesNet
199000000 USD
CY2020Q4 us-gaap Deferred Tax Assets Liabilities Net
DeferredTaxAssetsLiabilitiesNet
462000000 USD
CY2019Q4 us-gaap Deferred Tax Assets Liabilities Net
DeferredTaxAssetsLiabilitiesNet
446000000 USD
CY2020 us-gaap Valuation Allowance Deferred Tax Asset Change In Amount
ValuationAllowanceDeferredTaxAssetChangeInAmount
5000000 USD
CY2020Q4 us-gaap Deferred Tax Liabilities Undistributed Foreign Earnings
DeferredTaxLiabilitiesUndistributedForeignEarnings
37000000 USD
CY2020 aon Income Tax Holiday Income Tax Benefits
IncomeTaxHolidayIncomeTaxBenefits
97000000 USD
CY2019 aon Income Tax Holiday Income Tax Benefits
IncomeTaxHolidayIncomeTaxBenefits
90000000 USD
CY2018 aon Income Tax Holiday Income Tax Benefits
IncomeTaxHolidayIncomeTaxBenefits
77000000 USD
CY2020 us-gaap Income Tax Holiday Income Tax Benefits Per Share
IncomeTaxHolidayIncomeTaxBenefitsPerShare
0.42
CY2019 us-gaap Income Tax Holiday Income Tax Benefits Per Share
IncomeTaxHolidayIncomeTaxBenefitsPerShare
0.37
CY2018 us-gaap Income Tax Holiday Income Tax Benefits Per Share
IncomeTaxHolidayIncomeTaxBenefitsPerShare
0.31
CY2020 us-gaap Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations
UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
7000000 USD
CY2019Q4 us-gaap Unrecognized Tax Benefits
UnrecognizedTaxBenefits
299000000 USD
CY2018Q4 us-gaap Unrecognized Tax Benefits
UnrecognizedTaxBenefits
279000000 USD
CY2020 us-gaap Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
25000000 USD
CY2019 us-gaap Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
23000000 USD
CY2020 us-gaap Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
7000000 USD
CY2019 us-gaap Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
12000000 USD
CY2020 us-gaap Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
3000000 USD
CY2019 us-gaap Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
5000000 USD
CY2020 us-gaap Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities
UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
0 USD
CY2019 us-gaap Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities
UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
5000000 USD
CY2020 us-gaap Unrecognized Tax Benefits Increases Resulting From Acquisition
UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition
0 USD
CY2019 us-gaap Unrecognized Tax Benefits Increases Resulting From Acquisition
UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition
0 USD
CY2019 us-gaap Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations
UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
5000000 USD
CY2020 us-gaap Unrecognized Tax Benefits Increases Resulting From Foreign Currency Translation
UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation
0 USD
CY2019 us-gaap Unrecognized Tax Benefits Increases Resulting From Foreign Currency Translation
UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation
0 USD
CY2020Q4 us-gaap Unrecognized Tax Benefits
UnrecognizedTaxBenefits
321000000 USD
CY2018Q4 us-gaap Unrecognized Tax Benefits That Would Impact Effective Tax Rate
UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
228000000 USD
CY2020Q4 aon Distributable Reserves Available Amount
DistributableReservesAvailableAmount
200000000 USD
CY2020 us-gaap Unrecognized Tax Benefits Income Tax Penalties And Interest Expense
UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
21000000 USD
CY2019 us-gaap Unrecognized Tax Benefits Income Tax Penalties And Interest Expense
UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
24000000 USD
CY2019Q4 us-gaap Unrecognized Tax Benefits
UnrecognizedTaxBenefits
299000000 USD
CY2020Q4 us-gaap Unrecognized Tax Benefits That Would Impact Effective Tax Rate
UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
270000000 USD
CY2019Q4 us-gaap Unrecognized Tax Benefits That Would Impact Effective Tax Rate
UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
248000000 USD
CY2018 us-gaap Unrecognized Tax Benefits Income Tax Penalties And Interest Expense
UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
22000000 USD
CY2020Q4 us-gaap Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued
UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
120000000 USD
CY2019Q4 us-gaap Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued
UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
99000000 USD
CY2018Q4 us-gaap Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued
UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
77000000 USD
CY2019Q4 aon Distributable Reserves Available Amount
DistributableReservesAvailableAmount
32400000000 USD
CY2020Q4 us-gaap Stock Repurchase Program Authorized Amount1
StockRepurchaseProgramAuthorizedAmount1
20000000000.0 USD
CY2020 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:13pt;margin-top:13pt;text-align:justify"><table style="border-collapse:collapse;display:inline-table;vertical-align:top;width:99.707%"><tr><td style="width:1.0%"/><td style="width:48.166%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.533%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:23.533%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.533%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:23.535%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><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%">Twelve months ended December 31</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><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%">2020</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><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%">2019</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 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%">8.5 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:0 1pt"/><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%">10.5 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></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 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%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">206.28 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</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%">186.33 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;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%">Costs recorded to retained earnings</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 7.75pt;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%">Total repurchase cost</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><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%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">1,761 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</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%">1,950 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 7.75pt;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%">Additional associated costs</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;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%">2 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;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%">10 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;border-bottom: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%">Total costs recorded to retained earnings</span></td><td colspan="3" style="background-color:#ffffff;border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:1pt solid #000000;border-top: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%">$</span></td><td style="background-color:#ffffff;border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">1,763 </span></td><td style="background-color:#ffffff;border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-bottom:1pt solid #000000;border-top: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%">1,960 </span></td><td style="background-color:#ffffff;border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr></table></div>
us-gaap Treasury Stock Shares Acquired
TreasuryStockSharesAcquired
137300000 shares
CY2020 us-gaap Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
231900000 shares
CY2019 us-gaap Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
240600000 shares
us-gaap Treasury Stock Value Acquired Cost Method
TreasuryStockValueAcquiredCostMethod
14700000000 USD
CY2019 us-gaap Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
238600000 shares
CY2018 us-gaap Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
245200000 shares
CY2020 us-gaap Incremental Common Shares Attributable To Share Based Payment Arrangements
IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
1200000 shares
CY2019 us-gaap Incremental Common Shares Attributable To Share Based Payment Arrangements
IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
2000000.0 shares
CY2018 us-gaap Incremental Common Shares Attributable To Share Based Payment Arrangements
IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
1800000 shares
CY2020 us-gaap Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
233100000 shares
CY2018 us-gaap Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
247000000.0 shares
CY2020 us-gaap Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount
AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
0 shares
CY2018 us-gaap Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount
AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
0 shares
CY2019 us-gaap Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount
AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
0 shares
CY2018 us-gaap Oci Before Reclassifications Before Tax Attributable To Parent
OciBeforeReclassificationsBeforeTaxAttributableToParent
-576000000 USD
CY2018 us-gaap Other Comprehensive Income Loss Before Reclassifications Tax
OtherComprehensiveIncomeLossBeforeReclassificationsTax
-43000000 USD
CY2018 us-gaap Oci Before Reclassifications Net Of Tax Attributable To Parent
OciBeforeReclassificationsNetOfTaxAttributableToParent
-533000000 USD
CY2018 us-gaap Reclassification From Aoci Current Period Before Tax Attributable To Parent
ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent
-157000000 USD
CY2018 us-gaap Reclassification From Aoci Current Period Tax
ReclassificationFromAociCurrentPeriodTax
-36000000 USD
CY2018 us-gaap Reclassification From Aoci Current Period Net Of Tax Attributable To Parent
ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
-121000000 USD
CY2018 us-gaap Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
-412000000 USD
CY2019 us-gaap Oci Before Reclassifications Before Tax Attributable To Parent
OciBeforeReclassificationsBeforeTaxAttributableToParent
-282000000 USD
CY2019 us-gaap Other Comprehensive Income Loss Before Reclassifications Tax
OtherComprehensiveIncomeLossBeforeReclassificationsTax
-58000000 USD
CY2019 us-gaap Oci Before Reclassifications Net Of Tax Attributable To Parent
OciBeforeReclassificationsNetOfTaxAttributableToParent
-224000000 USD
CY2019 us-gaap Reclassification From Aoci Current Period Before Tax Attributable To Parent
ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent
-123000000 USD
CY2019 us-gaap Reclassification From Aoci Current Period Tax
ReclassificationFromAociCurrentPeriodTax
-23000000 USD
CY2019 us-gaap Reclassification From Aoci Current Period Net Of Tax Attributable To Parent
ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
-100000000 USD
CY2019 us-gaap Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
-124000000 USD
CY2020 us-gaap Oci Before Reclassifications Before Tax Attributable To Parent
OciBeforeReclassificationsBeforeTaxAttributableToParent
4000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Before Reclassifications Tax
OtherComprehensiveIncomeLossBeforeReclassificationsTax
-62000000 USD
CY2020 us-gaap Oci Before Reclassifications Net Of Tax Attributable To Parent
OciBeforeReclassificationsNetOfTaxAttributableToParent
66000000 USD
CY2020 us-gaap Reclassification From Aoci Current Period Before Tax Attributable To Parent
ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent
-140000000 USD
CY2020 us-gaap Reclassification From Aoci Current Period Tax
ReclassificationFromAociCurrentPeriodTax
-34000000 USD
CY2020 us-gaap Reclassification From Aoci Current Period Net Of Tax Attributable To Parent
ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
-106000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
172000000 USD
CY2020 us-gaap Defined Contribution Plan Cost Recognized
DefinedContributionPlanCostRecognized
155000000 USD
CY2019 us-gaap Defined Contribution Plan Cost Recognized
DefinedContributionPlanCostRecognized
164000000 USD
CY2018 us-gaap Defined Contribution Plan Cost Recognized
DefinedContributionPlanCostRecognized
168000000 USD
CY2020Q4 aon Defined Benefit Plan Percentage Of Total Pension Obligations
DefinedBenefitPlanPercentageOfTotalPensionObligations
0.91
CY2018 us-gaap Allocated Share Based Compensation Expense Net Of Tax
AllocatedShareBasedCompensationExpenseNetOfTax
264000000 USD
CY2020 us-gaap Allocated Share Based Compensation Expense
AllocatedShareBasedCompensationExpense
312000000 USD
CY2019 us-gaap Allocated Share Based Compensation Expense
AllocatedShareBasedCompensationExpense
317000000 USD
CY2018 us-gaap Allocated Share Based Compensation Expense
AllocatedShareBasedCompensationExpense
338000000 USD
CY2020 us-gaap Employee Service Share Based Compensation Tax Benefit From Compensation Expense
EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
61000000 USD
CY2019 us-gaap Employee Service Share Based Compensation Tax Benefit From Compensation Expense
EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
66000000 USD
CY2018 us-gaap Employee Service Share Based Compensation Tax Benefit From Compensation Expense
EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
74000000 USD
CY2020 us-gaap Allocated Share Based Compensation Expense Net Of Tax
AllocatedShareBasedCompensationExpenseNetOfTax
251000000 USD
CY2019 us-gaap Allocated Share Based Compensation Expense Net Of Tax
AllocatedShareBasedCompensationExpenseNetOfTax
251000000 USD
CY2019Q4 us-gaap Guarantee Obligations Maximum Exposure
GuaranteeObligationsMaximumExposure
110000000 USD
CY2020 us-gaap Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1
EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
P2Y1M6D
CY2020 us-gaap Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax
OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax
1000000 USD
CY2019 us-gaap Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax
OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax
-9000000 USD
CY2018 us-gaap Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax
OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
-18000000 USD
CY2020 us-gaap Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax
OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax
-15000000 USD
CY2019 us-gaap Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax
OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax
-14000000 USD
CY2018 us-gaap Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net
DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
-11000000 USD
CY2020 us-gaap Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months
CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
-7000000 USD
CY2020Q4 us-gaap Guarantee Obligations Maximum Exposure
GuaranteeObligationsMaximumExposure
113000000 USD
CY2019 us-gaap Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax
OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
0 USD
CY2020 us-gaap Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax
OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
0 USD
CY2018 us-gaap Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax
OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
0 USD
CY2020Q4 us-gaap Secured Debt Current
SecuredDebtCurrent
400000000 USD
CY2020Q4 us-gaap Shortterm Debt Fair Value
ShorttermDebtFairValue
401000000 USD
CY2019Q4 us-gaap Secured Debt Current
SecuredDebtCurrent
600000000 USD
CY2019Q4 us-gaap Shortterm Debt Fair Value
ShorttermDebtFairValue
614000000 USD
CY2020Q4 us-gaap Long Term Debt Noncurrent
LongTermDebtNoncurrent
7281000000 USD
CY2020Q4 us-gaap Long Term Debt Fair Value
LongTermDebtFairValue
8752000000 USD
CY2019Q4 us-gaap Long Term Debt Noncurrent
LongTermDebtNoncurrent
6627000000 USD
CY2019Q4 us-gaap Long Term Debt Fair Value
LongTermDebtFairValue
7442000000 USD
CY2020Q4 us-gaap Letters Of Credit Outstanding Amount
LettersOfCreditOutstandingAmount
79000000 USD
CY2019Q4 us-gaap Letters Of Credit Outstanding Amount
LettersOfCreditOutstandingAmount
73000000 USD
CY2020 us-gaap Number Of Reportable Segments
NumberOfReportableSegments
1 segment
CY2020 aon Numberof Revenue Lines
NumberofRevenueLines
5 revenue_line
CY2020 us-gaap Number Of Reportable Segments
NumberOfReportableSegments
1 segment
CY2020 aon Number Of Performance Metrics Measured
NumberOfPerformanceMetricsMeasured
4 metric
CY2020 us-gaap Number Of Reportable Segments
NumberOfReportableSegments
1 segment
CY2020Q4 aon Property Plant And Equipment And Operating Lease Right Of Use Asset After Accumulated Depreciationand Amortization
PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization
1599000000 USD
CY2019Q4 aon Property Plant And Equipment And Operating Lease Right Of Use Asset After Accumulated Depreciationand Amortization
PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization
1550000000 USD

Files In Submission

Name View Source Status
0001628280-21-002574-index-headers.html Edgar Link pending
0001628280-21-002574-index.html Edgar Link pending
0001628280-21-002574.txt Edgar Link pending
0001628280-21-002574-xbrl.zip Edgar Link pending
a1024aonplcseniorexecutive.htm Edgar Link pending
a1051johnbrunoemplltrfexec.htm Edgar Link pending
a1060fourthamendment-defer.htm Edgar Link pending
a1061aonglobalshareplannov.htm Edgar Link pending
a1068fourthamendment-ssp20.htm Edgar Link pending
a1069fifthamendment-ssp201.htm Edgar Link pending
a1074aon-bodtaxequalizatio.htm Edgar Link pending
aon-20201231.htm Edgar Link pending
aon-20201231.xsd Edgar Link pending
aon-20201231_cal.xml Edgar Link unprocessable
aon-20201231_def.xml Edgar Link unprocessable
aon-20201231_g1.jpg Edgar Link pending
aon-20201231_htm.xml Edgar Link completed
aon-20201231_lab.xml Edgar Link unprocessable
aon-20201231_pre.xml Edgar Link unprocessable
exhibit212020.htm Edgar Link pending
exhibit232020.htm Edgar Link pending
exhibit3112020.htm Edgar Link pending
exhibit3122020.htm Edgar Link pending
exhibit3212020.htm Edgar Link pending
exhibit3222020.htm Edgar Link pending
FilingSummary.xml Edgar Link unprocessable
Financial_Report.xlsx Edgar Link pending
image_01.jpg Edgar Link pending
image_11.jpg Edgar Link pending
MetaLinks.json Edgar Link pending
R1.htm Edgar Link pending
R10.htm Edgar Link pending
R100.htm Edgar Link pending
R101.htm Edgar Link pending
R102.htm Edgar Link pending
R103.htm Edgar Link pending
R104.htm Edgar Link pending
R105.htm Edgar Link pending
R106.htm Edgar Link pending
R107.htm Edgar Link pending
R108.htm Edgar Link pending
R109.htm Edgar Link pending
R11.htm Edgar Link pending
R110.htm Edgar Link pending
R111.htm Edgar Link pending
R112.htm Edgar Link pending
R113.htm Edgar Link pending
R114.htm Edgar Link pending
R12.htm Edgar Link pending
R13.htm Edgar Link pending
R14.htm Edgar Link pending
R15.htm Edgar Link pending
R16.htm Edgar Link pending
R17.htm Edgar Link pending
R18.htm Edgar Link pending
R19.htm Edgar Link pending
R2.htm Edgar Link pending
R20.htm Edgar Link pending
R21.htm Edgar Link pending
R22.htm Edgar Link pending
R23.htm Edgar Link pending
R24.htm Edgar Link pending
R25.htm Edgar Link pending
R26.htm Edgar Link pending
R27.htm Edgar Link pending
R28.htm Edgar Link pending
R29.htm Edgar Link pending
R3.htm Edgar Link pending
R30.htm Edgar Link pending
R31.htm Edgar Link pending
R32.htm Edgar Link pending
R33.htm Edgar Link pending
R34.htm Edgar Link pending
R35.htm Edgar Link pending
R36.htm Edgar Link pending
R37.htm Edgar Link pending
R38.htm Edgar Link pending
R39.htm Edgar Link pending
R4.htm Edgar Link pending
R40.htm Edgar Link pending
R41.htm Edgar Link pending
R42.htm Edgar Link pending
R43.htm Edgar Link pending
R44.htm Edgar Link pending
R45.htm Edgar Link pending
R46.htm Edgar Link pending
R47.htm Edgar Link pending
R48.htm Edgar Link pending
R49.htm Edgar Link pending
R5.htm Edgar Link pending
R50.htm Edgar Link pending
R51.htm Edgar Link pending
R52.htm Edgar Link pending
R53.htm Edgar Link pending
R54.htm Edgar Link pending
R55.htm Edgar Link pending
R56.htm Edgar Link pending
R57.htm Edgar Link pending
R58.htm Edgar Link pending
R59.htm Edgar Link pending
R6.htm Edgar Link pending
R60.htm Edgar Link pending
R61.htm Edgar Link pending
R62.htm Edgar Link pending
R63.htm Edgar Link pending
R64.htm Edgar Link pending
R65.htm Edgar Link pending
R66.htm Edgar Link pending
R67.htm Edgar Link pending
R68.htm Edgar Link pending
R69.htm Edgar Link pending
R7.htm Edgar Link pending
R70.htm Edgar Link pending
R71.htm Edgar Link pending
R72.htm Edgar Link pending
R73.htm Edgar Link pending
R74.htm Edgar Link pending
R75.htm Edgar Link pending
R76.htm Edgar Link pending
R77.htm Edgar Link pending
R78.htm Edgar Link pending
R79.htm Edgar Link pending
R8.htm Edgar Link pending
R80.htm Edgar Link pending
R81.htm Edgar Link pending
R82.htm Edgar Link pending
R83.htm Edgar Link pending
R84.htm Edgar Link pending
R85.htm Edgar Link pending
R86.htm Edgar Link pending
R87.htm Edgar Link pending
R88.htm Edgar Link pending
R89.htm Edgar Link pending
R9.htm Edgar Link pending
R90.htm Edgar Link pending
R91.htm Edgar Link pending
R92.htm Edgar Link pending
R93.htm Edgar Link pending
R94.htm Edgar Link pending
R95.htm Edgar Link pending
R96.htm Edgar Link pending
R97.htm Edgar Link pending
R98.htm Edgar Link pending
R99.htm Edgar Link pending
report.css Edgar Link pending
Show.js Edgar Link pending