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v2.4.1.9

Segment Information - Schedule of total revenue by business segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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] |  |  |  |  |  |  |  |  |  |  |
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
Total operating segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 12,045 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 11,815 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 11,514 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Risk Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
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
HR Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
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
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 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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- Details
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- Details
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- Details
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- Details
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- Details
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