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Other Financial Data Schedule of Non-current Assets (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Other Financial Data [Abstract] |  |
Prepaid pension | $ 897 us-gaap_PrepaidExpenseOtherNoncurrent | $ 933 us-gaap_PrepaidExpenseOtherNoncurrent
Deferred project costs | 237 us-gaap_DeferredCosts | 250 us-gaap_DeferredCosts
Deferred tax assets | 146 aon_OtherTaxAssetsNoncurrent | 144 aon_OtherTaxAssetsNoncurrent
Investments | 143 us-gaap_LongTermInvestments | 143 us-gaap_LongTermInvestments
Taxes receivable | 57 us-gaap_IncomeTaxesReceivableNoncurrent | 101 us-gaap_IncomeTaxesReceivableNoncurrent
Other | 198 us-gaap_OtherAssetsMiscellaneousNoncurrent | 233 us-gaap_OtherAssetsMiscellaneousNoncurrent
Total | $ 1,678 us-gaap_OtherAssetsNoncurrent | $ 1,804 us-gaap_OtherAssetsNoncurrent

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- Definition Sum of the carrying amounts of deferred costs that are expected to be recognized as a charge against earnings in periods after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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