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v2.4.1.9

Segment Information - Schedule of consolidated revenue by geographic area (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
Revenues from External Customers and Long-Lived Assets [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
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,824 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 5,574 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 5,336 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Americas other than U.S. [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,176 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = aon_AmericasOtherthanUnitedStatesMember | 1,214 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = aon_AmericasOtherthanUnitedStatesMember | 1,190 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = aon_AmericasOtherthanUnitedStatesMember
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,623 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_GB | 1,544 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_GB | 1,541 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_GB
Europe, Middle East and Africa [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,189 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = aon_EuropeMiddleEastandAfricaMember | 2,304 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = aon_EuropeMiddleEastandAfricaMember | 2,271 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = aon_EuropeMiddleEastandAfricaMember
Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 1,233 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = aon_SegmentGeographicalGroupsOfCountriesGroupThreeMember | $ 1,179 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = aon_SegmentGeographicalGroupsOfCountriesGroupThreeMember | $ 1,176 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = aon_SegmentGeographicalGroupsOfCountriesGroupThreeMember

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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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