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Subsequent Event - Disposition of Benefits Administration and Business Process Outsourcing (Details) - Tempo Business - Subsequent Event $ in Millions | Feb. 09, 2017 USD ($) agreement
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Subsequent Event [Line Items] |
Number Of Commercial Agreements | agreement | 2
Disposal Group, Disposed of by Sale, Not Discontinued Operations |
Subsequent Event [Line Items] |
Purchase price | $ 4,300
Deferred consideration | $ 500
Deferred consideration payment installments | 20.00%
Buyer required IRR to pay deferred consideration | 15.00%
Sponsor required return on cash proceeds | 225.00%
Customary transaction marketing period before close | 15 days
Agreement termination fee due | $ 215

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- Definition Disposal Group, Including Discontinued Operation, Agreement Termination Fee + References No definition available. + Details
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Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disposal Group Including Discontinued Operation, Buyer Required IRR + References No definition available. + Details
Name: | aon_DisposalGroupIncludingDiscontinuedOperationBuyerRequiredIRR
Namespace Prefix: | aon_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Disposal Group, Including Discontinued Operation, Deferred Consideration + References No definition available. + Details
Name: | aon_DisposalGroupIncludingDiscontinuedOperationDeferredConsideration
Namespace Prefix: | aon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disposal Group, Including Discontinued Operation, Deferred Consideration Payment Installments + References No definition available. + Details
Name: | aon_DisposalGroupIncludingDiscontinuedOperationDeferredConsiderationPaymentInstallments
Namespace Prefix: | aon_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Disposal Group, Including Discontinued Operation, Sponsor Required Return On Cash Proceeds + References No definition available. + Details
Name: | aon_DisposalGroupIncludingDiscontinuedOperationSponsorRequiredReturnOnCashProceeds
Namespace Prefix: | aon_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Disposal Group, Including Discontinued Operation, Transaction Completion Marketing Period + References No definition available. + Details
Name: | aon_DisposalGroupIncludingDiscontinuedOperationTransactionCompletionMarketingPeriod
Namespace Prefix: | aon_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Commercial Agreements + References No definition available. + Details
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Namespace Prefix: | aon_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |