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Reserve for Life-Contingent Contract Benefits and Contractholder Funds (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Contractholder funds        
Total contractholder funds $ 22,529us-gaap_PolicyholderContractDeposits $ 24,304us-gaap_PolicyholderContractDeposits $ 39,319us-gaap_PolicyholderContractDeposits $ 42,332us-gaap_PolicyholderContractDeposits
Interest-sensitive life insurance        
Contractholder funds        
Total contractholder funds 7,880us-gaap_PolicyholderContractDeposits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_InterestSensitiveLifeInsuranceMember
7,777us-gaap_PolicyholderContractDeposits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_InterestSensitiveLifeInsuranceMember
   
Key contract provisions relating to contractholder funds:        
Period for withdrawal or surrender charges 20 years      
Equity-indexed life insurance | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 0.00%all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_EquityIndexedLifeInsuranceMember
     
Equity-indexed life insurance | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 9.00%all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_EquityIndexedLifeInsuranceMember
     
Other life insurance | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 1.00%all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherLifeInsuranceMember
     
Other life insurance | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 6.00%all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherLifeInsuranceMember
     
Fixed annuities        
Contractholder funds        
Total contractholder funds 14,310us-gaap_PolicyholderContractDeposits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_FixedAnnuitiesMember
16,199us-gaap_PolicyholderContractDeposits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_FixedAnnuitiesMember
   
Key contract provisions relating to contractholder funds:        
Percent of fixed annuities subject to market value adjustment for discretionary withdrawals 21.50%all_FixedAnnuitiesSubjectToMarketValueAdjustmentPercent
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_FixedAnnuitiesMember
     
Fixed annuities | Maximum        
Key contract provisions relating to contractholder funds:        
Period for withdrawal or surrender charges 10 years      
Immediate fixed annuities | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 0.00%all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_ImmediateFixedAnnuitiesMember
     
Immediate fixed annuities | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 9.80%all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_ImmediateFixedAnnuitiesMember
     
Equity indexed fixed annuities | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) (8.00%)all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_EquityIndexedFixedAnnuitiesMember
     
Equity indexed fixed annuities | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 13.50%all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_EquityIndexedFixedAnnuitiesMember
     
Other fixed annuities | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 0.10%all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherFixedAnnuitiesMember
     
Other fixed annuities | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 6.00%all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherFixedAnnuitiesMember
     
Funding agreements backing medium-term notes        
Contractholder funds        
Total contractholder funds 85us-gaap_PolicyholderContractDeposits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_FundingAgreementsMember
89us-gaap_PolicyholderContractDeposits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_FundingAgreementsMember
   
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 2.49%all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_FundingAgreementsMember
     
Other investment contracts        
Contractholder funds        
Total contractholder funds $ 254us-gaap_PolicyholderContractDeposits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherInvestmentContractsMember
$ 239us-gaap_PolicyholderContractDeposits
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherInvestmentContractsMember
   
Other investment contracts | Minimum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 1.70%all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherInvestmentContractsMember
     
Other investment contracts | Maximum        
Key contract provisions relating to contractholder funds:        
Contractholder funds, interest rate assumptions (as a percent) 10.30%all_PolicyholderContractDepositsInterestRateAssumptions
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherInvestmentContractsMember