XML 59 R39.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Revenue from Contracts with Customers - Contract Assets Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Capitalized Cost To Fulfill Customer Contracts |  |
Change in Capitalized Contract Costs |  |
Balance at beginning of period | $ 370 | $ 355
Additions | 380 | 362
Amortization | (478) | (462)
Impairment | 0 | 0
Foreign currency translation and other | (3) | 2
Balance at end of period | 269 | 257
Capitalized Cost To Obtain Customer Contracts |  |
Change in Capitalized Contract Costs |  |
Balance at beginning of period | 195 | 185
Additions | 14 | 10
Amortization | (13) | (12)
Impairment | 0 | 0
Foreign currency translation and other | (2) | 0
Balance at end of period | $ 194 | $ 183

X
- Definition Capitalized Contract Cost, Additions + References No definition available. + Details
Name: | aon_CapitalizedContractCostAdditions
Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Capitalized Contract Cost, Foreign Currency And Other Adjustments Net + References No definition available. + Details
Name: | aon_CapitalizedContractCostForeignCurrencyAndOtherAdjustmentsNet
Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Change In Capitalized Contract Costs [Roll Forward] + References No definition available. + Details
Name: | aon_ChangeInCapitalizedContractCostsRollForward
Namespace Prefix: | aon_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
Name: | us-gaap_CapitalizedContractCostAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
Name: | us-gaap_CapitalizedContractCostImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
Name: | us-gaap_CapitalizedContractCostNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_CapitalizedContractCostAxis=aon_CapitalizedCostToFulfillCustomerContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedContractCostAxis=aon_CapitalizedCostToObtainCustomerContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |