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Investments (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Interest-bearing Assets |  |  |  |  |  |
Cash and cash equivalents | $ 374 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | $ 477 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | $ 291 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 272 us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments | 394 us-gaap_ShortTermInvestments |  | 523 us-gaap_ShortTermInvestments |  |  |
Fiduciary assets | 3,984 aon_FiduciaryAssetsInterestBearing | [1] | 3,778 aon_FiduciaryAssetsInterestBearing | [1] |  |
Investments | 143 us-gaap_LongTermInvestments |  | 132 us-gaap_LongTermInvestments |  |  |
Total interest-bearing assets | 4,895 aon_InvestmentsAndCashAndCashEquivalents |  | 4,910 aon_InvestmentsAndCashAndCashEquivalents |  |  |
Investments: |  |  |  |  |  |
Equity method investments | 124 us-gaap_EquityMethodInvestments | [2] | 113 us-gaap_EquityMethodInvestments | [2] |  |
Other investments, at cost | 12 us-gaap_OtherLongTermInvestments |  | 10 us-gaap_OtherLongTermInvestments |  |  |
Fixed-maturity securities | 7 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent |  | 9 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent |  |  |
Investments | $ 143 us-gaap_LongTermInvestments |  | $ 132 us-gaap_LongTermInvestments |  |  |
[1] | Fiduciary assets include funds held on behalf of clients but does not include fiduciary receivables.
[2] | The increase in equity method investments is primarily due to contributions to limited partnerships.

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- Definition Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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