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Investments- Realized Capital Gains and Losses by Transaction Type (Details 5) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Investments [Abstract]    
Impairment write-downs $ (7)alic_ImpairmentWriteDown $ (4)alic_ImpairmentWriteDown
Change in intent write-downs (3)alic_ChangeInIntentWriteDowns (5)alic_ChangeInIntentWriteDowns
Net OTTI losses recognized in earnings (10)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet (9)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Sales 117us-gaap_GainLossOnSaleOfSecuritiesNet 7us-gaap_GainLossOnSaleOfSecuritiesNet
Valuation and settlements of derivative instruments 4us-gaap_GainLossOnDerivativeInstrumentsNetPretax 2us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Total realized capital gains and losses 111us-gaap_RealizedInvestmentGainsLosses 0us-gaap_RealizedInvestmentGainsLosses
Fixed income securities    
Investments [Abstract]    
Net OTTI losses recognized in earnings (3)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember
(2)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember
Total realized capital gains and losses 68us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember
(5)us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember
Schedule of Available for Sale Securities    
Gross gains on sales of fixed income securities 131us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember
17us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember
Gross losses on sales of fixed income securities $ 23us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember
$ 14us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeSecuritiesMember