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Acquisitions and Dispositions - Dispositions (Details) (Disposal Groups [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 business | Dec. 31, 2013 business | Dec. 31, 2012 business
Risk Solutions [Member] |  |  |
Dispositions |  |  |
Number of dispositions | 2 aon_NumberOfDispositions / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = aon_DisposalGroupsMember / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 7 aon_NumberOfDispositions / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = aon_DisposalGroupsMember / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 3 aon_NumberOfDispositions / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = aon_DisposalGroupsMember / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
HR Solutions [Member] |  |  |
Dispositions |  |  |
Number of dispositions |  | 2 aon_NumberOfDispositions / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = aon_DisposalGroupsMember / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember | 1 aon_NumberOfDispositions / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = aon_DisposalGroupsMember / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
Other Income [Member] |  |  |
Dispositions |  |  |
Pretax gain recognized on sale of businesses | 24 aon_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalAndOther / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = aon_DisposalGroupsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | 10 aon_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalAndOther / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = aon_DisposalGroupsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | 1 aon_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalAndOther / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = aon_DisposalGroupsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember

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

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- 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

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

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |