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Acquisitions and Dispositions - Dispositions (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 business | Jun. 30, 2014 Risk Solutions [Member] business | Jun. 30, 2013 Risk Solutions [Member] business
Dispositions |  |  |
Number of dispositions | 0 | 1 | 4
Gain (loss) recognized on sale |  | $ 1,000,000 | $ 0

X
- Definition The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation and other income. It is included in income from continuing operations before income taxes in the income statement. + References No definition available. + Details
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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
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration