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Segment Information - Schedule of consolidated non-current assets by geographic area (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | $ 13,805 us-gaap_AssetsNoncurrent | $ 13,728 us-gaap_AssetsNoncurrent
United States [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 7,793 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = country_US | 7,720 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = country_US
Europe, Middle East and Africa [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 2,179 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = aon_EuropeMiddleEastandAfricaMember | 2,440 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = aon_EuropeMiddleEastandAfricaMember
Americas other than U.S. [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 493 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = aon_AmericasOtherthanUnitedStatesMember | 559 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = aon_AmericasOtherthanUnitedStatesMember
United Kingdom [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 2,700 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = country_GB | 2,392 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = country_GB
Asia Pacific [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | $ 640 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = aon_SegmentGeographicalGroupsOfCountriesGroupThreeMember | $ 617 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = aon_SegmentGeographicalGroupsOfCountriesGroupThreeMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.10-17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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