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Shareholders' Equity - Distributable Profits (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Jul. 26, 2021 | Dec. 31, 2020
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Equity [Abstract] |  |  |
Distributable profits approved amount |  | $ 34,000 |
Distributable reserves available amount | $ 32,700 |  | $ 200

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- Definition Distributable Profits Approved Amount + References No definition available. + Details
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Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition Represents the amount of distributable reserves maintained by the entity. + References No definition available. + Details
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Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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