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v2.4.1.9

Segment Information - Schedule of commissions, fees, and other revenue by products (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other | $ 3,292 aon_CommissionsFeesAndOther | $ 2,873 aon_CommissionsFeesAndOther | $ 2,913 aon_CommissionsFeesAndOther | $ 2,941 aon_CommissionsFeesAndOther | $ 3,202 aon_CommissionsFeesAndOther | $ 2,786 aon_CommissionsFeesAndOther | $ 2,891 aon_CommissionsFeesAndOther | $ 2,908 aon_CommissionsFeesAndOther | $ 12,019 aon_CommissionsFeesAndOther | $ 11,787 aon_CommissionsFeesAndOther | $ 11,476 aon_CommissionsFeesAndOther
Revenue | 3,299 us-gaap_Revenues | 2,880 us-gaap_Revenues | 2,919 us-gaap_Revenues | 2,947 us-gaap_Revenues | 3,209 us-gaap_Revenues | 2,794 us-gaap_Revenues | 2,897 us-gaap_Revenues | 2,915 us-gaap_Revenues | 12,045 us-gaap_Revenues | 11,815 us-gaap_Revenues | 11,514 us-gaap_Revenues
Risk Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | 7,808 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 7,761 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 7,594 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
Revenue |  |  |  |  |  |  |  |  | 7,834 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 7,789 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember | 7,632 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = aon_RiskAndInsuranceBrokerageServicesMember
Retail brokerage [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | 6,334 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_RetailBrokerageRevenuesMember | 6,256 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_RetailBrokerageRevenuesMember | 6,089 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_RetailBrokerageRevenuesMember
Reinsurance brokerage [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | 1,474 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ReinsuranceBrokerageRevenuesMember | 1,505 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ReinsuranceBrokerageRevenuesMember | 1,505 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ReinsuranceBrokerageRevenuesMember
HR Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | 4,264 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember | 4,057 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember | 3,925 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
Revenue |  |  |  |  |  |  |  |  | 4,264 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember | 4,057 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember | 3,925 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingMember
Consulting services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | 1,700 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingServicesRevenuesMember | 1,626 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingServicesRevenuesMember | 1,585 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingServicesRevenuesMember
Outsourcing [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | 2,607 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_OutsourcingRevenuesMember | 2,469 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_OutsourcingRevenuesMember | 2,372 aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_OutsourcingRevenuesMember
Intrasegment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commissions, fees and other |  |  |  |  |  |  |  |  | (43)aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingIntrasegmentEliminationsMember | (38)aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingIntrasegmentEliminationsMember | (32)aon_CommissionsFeesAndOther / us-gaap_StatementBusinessSegmentsAxis = aon_ConsultingIntrasegmentEliminationsMember
Intersegment elimination [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ (53)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | $ (31)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | $ (43)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember

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- Definition The sum of Commissions, Fees and Other Income. Commissions and fees reflects the total commissions and fees earned from providing services such as (1) brokerage and (2) other such services and activities performed for others. Other income reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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