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Investments (Details 12) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investment Holdings    
Limited partnership interests $ 4,527us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 4,967us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Tax credit funds 560all_TaxCreditFunds  
Other details of unrealized loss    
Unrealized losses related to securities with unrealized loss position less than 20% of cost or amortized cost 284all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfLessThanTwentyPercent  
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of cost or amortized cost 85all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfTwentyPercentOrHigher  
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 130all_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 28all_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 49all_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
 
Equity 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 8all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfTwentyPercentOrHigher
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Equity-method limited partnerships    
Investment Holdings    
Limited partnership interests 3,410us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityMethodInvestmentsMember
3,520us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityMethodInvestmentsMember
Cost-method limited partnership interests    
Investment Holdings    
Limited partnership interests $ 1,120us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentTypeAxis
= us-gaap_CostmethodInvestmentsMember
$ 1,440us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentTypeAxis
= us-gaap_CostmethodInvestmentsMember