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v3.25.1

Acquisitions and Dispositions of Businesses - Completed Dispositions (Details) | 3 Months Ended
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Mar. 31, 2025 USD ($) disposition | Mar. 31, 2024 USD ($) disposition
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] |  |
Number of dispositions | disposition | 0 | 1
Gain on disposition of business | $ | $ 0 | $ 0

X
- 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

X
- 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

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