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Investments (Details 12) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Other details of unrealized loss    
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost $ (203)all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfLessThanTwentyPercent  
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost (88)all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfTwentyPercentOrHigher  
Limited partnership interests 4,699us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 4,527us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Investment grade fixed income securities    
Other details of unrealized loss    
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost (72)all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfLessThanTwentyPercent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= all_InvestmentGradeFixedIncomeSecuritiesMember		  
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost (38)all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfTwentyPercentOrHigher
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= all_InvestmentGradeFixedIncomeSecuritiesMember		  
Below investment grade fixed income securities    
Other details of unrealized loss    
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost (42)all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfTwentyPercentOrHigher
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= all_BelowInvestmentGradeFixedIncomeSecuritiesMember		  
Unrealized losses related to securities with unrealized loss position greater than 20% of cost or amortized cost, unrealized loss position of 12 or more consecutive months 6all_AvailableForSaleSecuritiesUnrealizedLossesForFixedIncomeSecuritiesHeldForTwelveMonthsOrLongerPeriod
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= all_BelowInvestmentGradeFixedIncomeSecuritiesMember		  
Below Investment Grade Equity Securities [Member]    
Other details of unrealized loss    
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost (8)all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfTwentyPercentOrHigher
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= all_BelowInvestmentGradeEquitySecuritiesMember		  
Equity-method limited partnerships    
Other details of unrealized loss    
Limited partnership interests 3,560us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityMethodInvestmentsMember		 3,410us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityMethodInvestmentsMember
Carrying value    
Other details of unrealized loss    
Cost Method Investments 1,137us-gaap_CostMethodInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 1,122us-gaap_CostMethodInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Carrying value | Cost-method Investments    
Other details of unrealized loss    
Cost Method Investments $ 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