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Reporting Segments (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information                      
Property-liability insurance premiums                 $ 28,929us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 27,618us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 26,737us-gaap_PremiumsEarnedNetPropertyAndCasualty
Life and annuity premiums and contract charges                 2,157all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded 2,352all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded 2,241all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
Net investment income                 3,459us-gaap_NetInvestmentIncome 3,943us-gaap_NetInvestmentIncome 4,010us-gaap_NetInvestmentIncome
Realized capital gains and losses                 694us-gaap_RealizedInvestmentGainsLosses 594us-gaap_RealizedInvestmentGainsLosses 327us-gaap_RealizedInvestmentGainsLosses
Consolidated revenues 8,759us-gaap_Revenues 8,936us-gaap_Revenues 8,860us-gaap_Revenues 8,684us-gaap_Revenues 8,792us-gaap_Revenues 8,465us-gaap_Revenues 8,787us-gaap_Revenues 8,463us-gaap_Revenues 35,239us-gaap_Revenues 34,507us-gaap_Revenues 33,315us-gaap_Revenues
Property-Liability                      
Segment Reporting Information                      
Property-liability insurance premiums                 28,928us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
27,618us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
26,737us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
Net investment income                 1,301us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
1,375us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
1,326us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
Realized capital gains and losses                 549us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
519us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
335us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
Consolidated revenues                 30,779us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
29,512us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
28,398us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
Property-Liability | Auto                      
Segment Reporting Information                      
Property-liability insurance premiums                 19,344us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_AutoMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
18,449us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_AutoMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
17,928us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_AutoMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
Property-Liability | Homeowners                      
Segment Reporting Information                      
Property-liability insurance premiums                 6,904us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_HomeOwnersMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
6,613us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_HomeOwnersMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
6,359us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_HomeOwnersMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
Property-Liability | Other personal lines                      
Segment Reporting Information                      
Property-liability insurance premiums                 1,662us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherPersonalLinesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
1,629us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherPersonalLinesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
1,594us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherPersonalLinesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
Property-Liability | Commercial lines                      
Segment Reporting Information                      
Property-liability insurance premiums                 476us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
456us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
462us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
Property-Liability | Other business lines                      
Segment Reporting Information                      
Property-liability insurance premiums                 542us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherBusinessLinesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
471us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherBusinessLinesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
394us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_OtherBusinessLinesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
Discontinued Lines and Coverages                      
Segment Reporting Information                      
Property-liability insurance premiums                 1us-gaap_PremiumsEarnedNetPropertyAndCasualty
/ us-gaap_StatementBusinessSegmentsAxis
= all_DiscontinuedLinesAndCoveragesMember
   
Allstate Financial                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 2,157all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
2,352all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
2,241all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Net investment income                 2,131us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
2,538us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
2,647us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Realized capital gains and losses                 144us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
74us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
(13)us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Consolidated revenues                 4,432us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
4,964us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
4,875us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Allstate Financial | Total life and annuity premiums                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 1,259all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_TotalLifeAndAnnuityPremiumsMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
1,248all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_TotalLifeAndAnnuityPremiumsMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
1,168all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_TotalLifeAndAnnuityPremiumsMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Allstate Financial | Traditional life insurance                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 511all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_TraditionalLifeInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
491all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_TraditionalLifeInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
470all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_TraditionalLifeInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Allstate Financial | Immediate annuities with life contingencies                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 4all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_ImmediateAnnuitiesWithLifeContingenciesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
37all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_ImmediateAnnuitiesWithLifeContingenciesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
45all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_ImmediateAnnuitiesWithLifeContingenciesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Allstate Financial | Accident and health insurance                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 744all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_AccidentHealthAndOtherMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
720all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_AccidentHealthAndOtherMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
653all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_AccidentHealthAndOtherMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Allstate Financial | Total contract charges                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 898all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_TotalContractChargesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
1,104all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_TotalContractChargesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
1,073all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_TotalContractChargesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Allstate Financial | Interest-sensitive life insurance                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 879all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_InterestSensitiveLifeInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
1,086all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_InterestSensitiveLifeInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
1,055all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_InterestSensitiveLifeInsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Allstate Financial | Fixed annuities                      
Segment Reporting Information                      
Life and annuity premiums and contract charges                 19all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_FixedAnnuitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
18all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_FixedAnnuitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
18all_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_FixedAnnuitiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Corporate and Other                      
Segment Reporting Information                      
Service fees                 5us-gaap_FeesAndCommissions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
9us-gaap_FeesAndCommissions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
4us-gaap_FeesAndCommissions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Net investment income                 27us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
30us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
37us-gaap_NetInvestmentIncome
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Realized capital gains and losses                 1us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
1us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
5us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Total Corporate and Other before reclassification of service fees                 33all_RevenueBeforeReclassificationOfServiceFees
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
40all_RevenueBeforeReclassificationOfServiceFees
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
46all_RevenueBeforeReclassificationOfServiceFees
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Reclassification of service fees                 (5)all_ReclassificationOfServiceFees
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(9)all_ReclassificationOfServiceFees
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(4)all_ReclassificationOfServiceFees
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Consolidated revenues                 $ 28us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ 31us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ 42us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember