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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reinsurance premium ceded amounts $ 1,446us-gaap_CededPremiumsEarned $ 1,708us-gaap_CededPremiumsEarned $ 1,764us-gaap_CededPremiumsEarned
Property-liability insurance claims and claims expense      
Reinsurance ceded amount 1,393all_ReinsuranceCededAmount
/ us-gaap_IncomeStatementLocationAxis
= all_PropertyLiabilityInsuranceClaimsAndClaimsExpenseMember		 1,717all_ReinsuranceCededAmount
/ us-gaap_IncomeStatementLocationAxis
= all_PropertyLiabilityInsuranceClaimsAndClaimsExpenseMember		 2,051all_ReinsuranceCededAmount
/ us-gaap_IncomeStatementLocationAxis
= all_PropertyLiabilityInsuranceClaimsAndClaimsExpenseMember
Life and annuity contract benefits      
Reinsurance ceded amount 356all_ReinsuranceCededAmount
/ us-gaap_IncomeStatementLocationAxis
= all_LifeAndAnnuityContractBenefitsMember		 355all_ReinsuranceCededAmount
/ us-gaap_IncomeStatementLocationAxis
= all_LifeAndAnnuityContractBenefitsMember		 665all_ReinsuranceCededAmount
/ us-gaap_IncomeStatementLocationAxis
= all_LifeAndAnnuityContractBenefitsMember
Interest credited to contractholder funds      
Reinsurance ceded amount 26all_ReinsuranceCededAmount
/ us-gaap_IncomeStatementLocationAxis
= all_InterestCreditedToContractholderFundsMember		 27all_ReinsuranceCededAmount
/ us-gaap_IncomeStatementLocationAxis
= all_InterestCreditedToContractholderFundsMember		 28all_ReinsuranceCededAmount
/ us-gaap_IncomeStatementLocationAxis
= all_InterestCreditedToContractholderFundsMember
Property-liability insurance premiums earned      
Reinsurance premium ceded amounts 1,030us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 1,069us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 1,090us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Life and annuity premiums and contract charges      
Premiums and contract charges ceded amounts $ 416all_CededLifeAndAnnuityPremiumsAndContractCharges
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeAndAnnuityInsuranceProductLineMember		 $ 639all_CededLifeAndAnnuityPremiumsAndContractCharges
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeAndAnnuityInsuranceProductLineMember		 $ 674all_CededLifeAndAnnuityPremiumsAndContractCharges
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeAndAnnuityInsuranceProductLineMember