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Fair Value of Assets and Liabilities (Details 6) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Financial assets        
Mortgage loans $ 4,276us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet $ 4,188us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet    
Financial liabilities        
Long-term debt 5,194us-gaap_LongTermDebt 5,194us-gaap_LongTermDebt    
Liability for collateral 755all_ObligationToReturnCollateralSecuritiesLendingAndDerivatives 782all_ObligationToReturnCollateralSecuritiesLendingAndDerivatives 780all_ObligationToReturnCollateralSecuritiesLendingAndDerivatives 624all_ObligationToReturnCollateralSecuritiesLendingAndDerivatives
Carrying value        
Financial assets        
Mortgage loans 4,276us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
4,188us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Cost method limited partnerships 1,137us-gaap_CostMethodInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
1,122us-gaap_CostMethodInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Bank loans 1,722all_BankLoansCategorizedUnderOtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
1,663all_BankLoansCategorizedUnderOtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Agent loans 386all_AgentLoansCategorizedUnderOtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
368all_AgentLoansCategorizedUnderOtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Financial liabilities        
Contract holder funds on investment contracts 13,444all_ContractholderFundsOnInvestmentContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
13,734all_ContractholderFundsOnInvestmentContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Liability for collateral 755all_ObligationToReturnCollateralSecuritiesLendingAndDerivatives
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
782all_ObligationToReturnCollateralSecuritiesLendingAndDerivatives
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Estimate of Fair Value Measurement [Member]        
Financial assets        
Mortgage loans 4,546us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
4,446us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Cost method limited partnerships 1,494us-gaap_CostMethodInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
1,488us-gaap_CostMethodInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Bank loans 1,718all_BankLoansCategorizedUnderOtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
1,638all_BankLoansCategorizedUnderOtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Agent loans 379all_AgentLoansCategorizedUnderOtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
361all_AgentLoansCategorizedUnderOtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Financial liabilities        
Contract holder funds on investment contracts 14,134all_ContractholderFundsOnInvestmentContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
14,390all_ContractholderFundsOnInvestmentContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Long-term debt 6,025us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
5,835us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Liability for collateral 755all_ObligationToReturnCollateralSecuritiesLendingAndDerivatives
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
782all_ObligationToReturnCollateralSecuritiesLendingAndDerivatives
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Cost-method Investments | Carrying value        
Financial assets        
Cost method limited partnerships $ 1,137us-gaap_CostMethodInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CostmethodInvestmentsMember
$ 1,122us-gaap_CostMethodInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_CostmethodInvestmentsMember