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Acquisitions and Dispositions - Dispositions (Details) (Risk Solutions [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 business | Sep. 30, 2013 business | Sep. 30, 2014 business | Sep. 30, 2013 business
Risk Solutions [Member] |  |  |  |
Dispositions |  |  |  |
Number of dispositions | 1 | 1 | 2 | 5
Gain (loss) recognized on sale | $ 25.0 | $ 0.2 | $ 25.0 | $ 0.2

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
Name: | aon_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalAndOther
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
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration