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Investments (Details 7) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investments [Abstract]      
Net unrealized gains related to changes in valuation of fixed income securities subsequent to impairment measurement date $ 138all_UnrealizedGainLossFixedIncomeSecuritiesChangesInValuationSubsequentToImpairment $ 164all_UnrealizedGainLossFixedIncomeSecuritiesChangesInValuationSubsequentToImpairment  
Other-than-temporary impairment losses included in accumulated other comprehensive income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (66)all_OtherThanTemporaryImpairmentLossesInvestmentsPortionInAccumulatedOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent (117)all_OtherThanTemporaryImpairmentLossesInvestmentsPortionInAccumulatedOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent  
Reduction in credit loss for securities disposed or collected 44us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold 75us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold 288us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold
Credit Losses on Fixed Income Securities      
Beginning balance (299)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld (345)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld (581)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
Additional credit loss for securities previously other-than-temporarily impaired (6)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses (13)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses (33)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses
Additional credit loss for securities not previously other-than-temporarily impaired (9)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment (19)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment (20)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment
Reduction in credit loss for securities the Company has made the decision to sell or more likely than not will be required to sell 0all_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionSecurityImpairedToFairValue 2all_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionSecurityImpairedToFairValue 0all_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionSecurityImpairedToFairValue
Change in credit loss due to accretion of increase in cash flows 2all_OtherThanTemporaryImpairmentChangeInCreditLossesRecognizedInEarningsDueToAccretionInCashFlowsAndTimeValueOfCashFlows 1all_OtherThanTemporaryImpairmentChangeInCreditLossesRecognizedInEarningsDueToAccretionInCashFlowsAndTimeValueOfCashFlows 1all_OtherThanTemporaryImpairmentChangeInCreditLossesRecognizedInEarningsDueToAccretionInCashFlowsAndTimeValueOfCashFlows
Ending balance (209)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld (299)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld (345)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
Cumulative credit losses recognized in earnings for securities classified as held for sale 60all_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldForSale    
Municipal      
Other-than-temporary impairment losses included in accumulated other comprehensive income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (5)all_OtherThanTemporaryImpairmentLossesInvestmentsPortionInAccumulatedOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
(5)all_OtherThanTemporaryImpairmentLossesInvestmentsPortionInAccumulatedOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
ABS      
Other-than-temporary impairment losses included in accumulated other comprehensive income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (1)all_OtherThanTemporaryImpairmentLossesInvestmentsPortionInAccumulatedOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
(10)all_OtherThanTemporaryImpairmentLossesInvestmentsPortionInAccumulatedOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
 
RMBS      
Other-than-temporary impairment losses included in accumulated other comprehensive income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (55)all_OtherThanTemporaryImpairmentLossesInvestmentsPortionInAccumulatedOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
(90)all_OtherThanTemporaryImpairmentLossesInvestmentsPortionInAccumulatedOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
CMBS      
Other-than-temporary impairment losses included in accumulated other comprehensive income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (5)all_OtherThanTemporaryImpairmentLossesInvestmentsPortionInAccumulatedOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
(12)all_OtherThanTemporaryImpairmentLossesInvestmentsPortionInAccumulatedOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Lincoln Benefit Life Company      
Other-than-temporary impairment losses included in accumulated other comprehensive income      
Reduction in credit loss for securities disposed or collected $ 59us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= all_LincolnBenefitLifeCompanyMember
$ 0us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= all_LincolnBenefitLifeCompanyMember
$ 0us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= all_LincolnBenefitLifeCompanyMember