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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 467 us-gaap_ProfitLoss | $ 315 us-gaap_ProfitLoss | $ 313 us-gaap_ProfitLoss | $ 336 us-gaap_ProfitLoss | $ 360 us-gaap_ProfitLoss | $ 264 us-gaap_ProfitLoss | $ 252 us-gaap_ProfitLoss | $ 272 us-gaap_ProfitLoss | $ 1,431 us-gaap_ProfitLoss | $ 1,148 us-gaap_ProfitLoss | $ 1,020 us-gaap_ProfitLoss
Less: Net income attributable to noncontrolling interests | 8 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 6 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 9 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 11 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 5 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 8 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 11 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 11 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 34 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 35 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 27 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to Aon shareholders | 459 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 309 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 304 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 325 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 355 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 256 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 241 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 261 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 1,397 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 1,113 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 993 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Other comprehensive (loss) gain, net of tax: |  |  |  |  |  |  |  |  |  |  |
Change in fair value of investments |  |  |  |  |  |  |  |  | (1)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 1 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 0 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Change in fair value of derivatives |  |  |  |  |  |  |  |  | 5 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | 6 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | 9 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | (507)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | (65)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | 109 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Post-retirement benefit obligation |  |  |  |  |  |  |  |  | (260)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | 293 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | (358)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Total other comprehensive (loss) income |  |  |  |  |  |  |  |  | (763)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 235 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (240)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Less: Other comprehensive (loss) income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (3)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest | (1)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
Total other comprehensive (loss) income attributable to Aon shareholders |  |  |  |  |  |  |  |  | (760)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 236 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (240)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income attributable to Aon shareholders |  |  |  |  |  |  |  |  | $ 637 us-gaap_ComprehensiveIncomeNetOfTax | $ 1,349 us-gaap_ComprehensiveIncomeNetOfTax | $ 753 us-gaap_ComprehensiveIncomeNetOfTax

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