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Derivative Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]      
Loss after tax was reclassified from AOCI into Discontinued operations, net of income taxes $ 4l_GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNetOfIncomeTax    
Market-to-market losses after tax recognized on derivatives 2us-gaap_DerivativeLossOnDerivative    
Gains (losses) from changes in fair value of derivatives included in Investment gains (losses) (1)l_GainsAndLossesFromChangesInFairValueOfDerivativesIncludedInInvestmentGainsLosses (9)l_GainsAndLossesFromChangesInFairValueOfDerivativesIncludedInInvestmentGainsLosses (5)l_GainsAndLossesFromChangesInFairValueOfDerivativesIncludedInInvestmentGainsLosses
Gains (losses) from changes in fair value of derivatives held for trading included in Net investment income 12us-gaap_GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet (26)us-gaap_GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet (19)us-gaap_GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet
Amount of gain (losses) recognized in OCI 3us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet 10us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet 1us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Amount of gains (losses) reclassified from AOCI into income 1us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet (8)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet (6)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Estimated amount of net unrealized losses associated with cash flow hedges that will be reclassified from AOCI into earnings during next twelve months 2us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths    
Maximum [Member]      
Derivative [Line Items]      
Net amounts recognized due to ineffectiveness $ 1us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 1us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 1us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember