Investments (Net Realized Gains (Losses) And Losses Included In Net Realized Gains (Losses) And Other Comprehensive Income) (Detail) (USD $) In Millions, unless otherwise specified
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3 Months Ended |
12 Months Ended |
Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Investments, Debt and Equity Securities [Abstract] |
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OTTI on fixed maturities, gross |
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$ (64)ace_FixedMaturitiesOtherThanTemporaryImpairmentsGross |
$ (18)ace_FixedMaturitiesOtherThanTemporaryImpairmentsGross |
$ (26)ace_FixedMaturitiesOtherThanTemporaryImpairmentsGross |
OTTI on fixed maturities recognized in OCI (pre-tax) |
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7ace_FixedMaturitiesOtherThanTemporaryImpairmentsInOtherComprehensiveIncomePreTax |
0ace_FixedMaturitiesOtherThanTemporaryImpairmentsInOtherComprehensiveIncomePreTax |
1ace_FixedMaturitiesOtherThanTemporaryImpairmentsInOtherComprehensiveIncomePreTax |
OTTI on fixed maturities, net |
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(57)ace_FixedMaturitiesOtherThanTemporaryImpairmentsNet |
(18)ace_FixedMaturitiesOtherThanTemporaryImpairmentsNet |
(25)ace_FixedMaturitiesOtherThanTemporaryImpairmentsNet |
Fixed maturities, Gross realized gains excluding OTTI |
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213ace_FixedMaturitiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments |
237ace_FixedMaturitiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments |
388ace_FixedMaturitiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments |
Fixed maturities, Gross realized losses excluding OTTI |
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(133)ace_FixedMaturitiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments |
(129)ace_FixedMaturitiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments |
(133)ace_FixedMaturitiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments |
Total fixed maturities |
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23ace_FixedMaturitiesNetRealizedGainsLossesTotal |
90ace_FixedMaturitiesNetRealizedGainsLossesTotal |
230ace_FixedMaturitiesNetRealizedGainsLossesTotal |
OTTI on equity securities |
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(8)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment |
(2)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment |
(5)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment |
Equity securities, Gross realized gains excluding OTTI |
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22ace_EquitySecuritiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments |
21ace_EquitySecuritiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments |
11ace_EquitySecuritiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments |
Equity securities, Gross realized losses excluding OTTI |
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(61)ace_EquitySecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments |
(4)ace_EquitySecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments |
(2)ace_EquitySecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments |
Total equity securities |
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(47)ace_EquitySecuritiesNetRealizedGainsLossesTotal |
15ace_EquitySecuritiesNetRealizedGainsLossesTotal |
4ace_EquitySecuritiesNetRealizedGainsLossesTotal |
OTTI on other investments |
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(3)ace_OtherInvestmentsOtherThanTemporaryImpairments |
(2)ace_OtherInvestmentsOtherThanTemporaryImpairments |
(7)ace_OtherInvestmentsOtherThanTemporaryImpairments |
Foreign exchange losses |
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(40)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |
29us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |
(16)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |
Investment and embedded derivative instruments |
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(107)ace_InvestmentAndEmbeddedDerivativeInstrumentsGainsLosses |
78ace_InvestmentAndEmbeddedDerivativeInstrumentsGainsLosses |
(6)ace_InvestmentAndEmbeddedDerivativeInstrumentsGainsLosses |
Fair value adjustments on insurance derivative |
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(217)ace_FairValueAdjustmentsOnInsuranceDerivativeGainsLosses |
878ace_FairValueAdjustmentsOnInsuranceDerivativeGainsLosses |
171ace_FairValueAdjustmentsOnInsuranceDerivativeGainsLosses |
S&P put options and futures |
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(168)ace_StandardAndPoorsPutOptionsAndFuturesGainsLosses |
(579)ace_StandardAndPoorsPutOptionsAndFuturesGainsLosses |
(297)ace_StandardAndPoorsPutOptionsAndFuturesGainsLosses |
Other derivative instruments |
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50ace_OtherDerivativeInstrumentsGainsLosses |
(2)ace_OtherDerivativeInstrumentsGainsLosses |
(4)ace_OtherDerivativeInstrumentsGainsLosses |
Other |
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2ace_OtherRealizedGainsLosses |
(3)ace_OtherRealizedGainsLosses |
3ace_OtherRealizedGainsLosses |
Total net realized gains (losses) |
(210)ace_NetRealizedGainsLosses |
(120)ace_NetRealizedGainsLosses |
(73)ace_NetRealizedGainsLosses |
(104)ace_NetRealizedGainsLosses |
154ace_NetRealizedGainsLosses |
40ace_NetRealizedGainsLosses |
104ace_NetRealizedGainsLosses |
206ace_NetRealizedGainsLosses |
(507)ace_NetRealizedGainsLosses |
504ace_NetRealizedGainsLosses |
78ace_NetRealizedGainsLosses |
Change in net unrealized appreciation (depreciation) on investments, Fixed maturities available for sale |
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734ace_ChangeInNetUnrealizedAppreciationDepreciationFixedMaturitiesAvailableForSale |
(1,798)ace_ChangeInNetUnrealizedAppreciationDepreciationFixedMaturitiesAvailableForSale |
1,099ace_ChangeInNetUnrealizedAppreciationDepreciationFixedMaturitiesAvailableForSale |
Change in net unrealized appreciation (depreciation) on investments, Fixed maturities held to maturity |
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(2)ace_ChangeInNetUnrealizedAppreciationDepreciationFixedMaturitiesHeldToMaturity |
(82)ace_ChangeInNetUnrealizedAppreciationDepreciationFixedMaturitiesHeldToMaturity |
(94)ace_ChangeInNetUnrealizedAppreciationDepreciationFixedMaturitiesHeldToMaturity |
Change in net unrealized appreciation (depreciation) on investments, Equity securities |
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77ace_ChangeInNetUnrealizedAppreciationDepreciationEquities |
(41)ace_ChangeInNetUnrealizedAppreciationDepreciationEquities |
61ace_ChangeInNetUnrealizedAppreciationDepreciationEquities |
Change in net unrealized appreciation (depreciation) on investments, Other |
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35ace_ChangeInNetUnrealizedAppreciationDepreciationOtherInvestments |
54ace_ChangeInNetUnrealizedAppreciationDepreciationOtherInvestments |
50ace_ChangeInNetUnrealizedAppreciationDepreciationOtherInvestments |
Change in net unrealized appreciation (depreciation) on investments, Income tax expense |
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(167)ace_ChangeInNetUnrealizedAppreciationDepreciationIncomeTaxExpenseBenefit |
408ace_ChangeInNetUnrealizedAppreciationDepreciationIncomeTaxExpenseBenefit |
(198)ace_ChangeInNetUnrealizedAppreciationDepreciationIncomeTaxExpenseBenefit |
Change in net unrealized appreciation on investments, |
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677ace_ChangeInNetUnrealizedAppreciationDepreciation |
(1,459)ace_ChangeInNetUnrealizedAppreciationDepreciation |
918ace_ChangeInNetUnrealizedAppreciationDepreciation |
Total net realized gains (losses) and change in net unrealized appreciation (depreciation) on investments |
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$ 170ace_NetRealizedGainsLossesAndChangeInNetUnrealizedAppreciationDepreciation |
$ (955)ace_NetRealizedGainsLossesAndChangeInNetUnrealizedAppreciationDepreciation |
$ 996ace_NetRealizedGainsLossesAndChangeInNetUnrealizedAppreciationDepreciation |