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v3.24.3

Acquisitions and Dispositions of Businesses - Completed Dispositions (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) disposition | Sep. 30, 2023 USD ($) disposition | Sep. 30, 2024 USD ($) disposition | Sep. 30, 2023 USD ($) disposition
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] |  |  |  |
Number of dispositions | disposition | 2 | 0 | 5 | 0
Gain on disposition of business | $ 76 | $ 0 | $ 333 | $ 0
Loss on disposition of business | $ 0 | $ 0 | $ 2 | $ 0

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- Definition Gain On Disposition of Business + References No definition available. + Details
Name: | aon_GainOnDispositionOfBusiness
Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Loss On Disposition Of Business + References No definition available. + Details
Name: | aon_LossOnDispositionOfBusiness
Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the number of entities disposed of by the reporting entity. + References No definition available. + Details
Name: | aon_NumberOfDispositions
Namespace Prefix: | aon_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_BusinessCombinationAndAssetAcquisitionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration