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Investments (Details 11) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other details of unrealized loss    
Unrealized losses related to securities with unrealized loss position less than 20% of amortized cost or cost $ 147all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfLessThanTwentyPercent  
Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of amortized cost or cost 58all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfTwentyPercentOrHigher  
Limited partnerships    
Limited partnership interests 2,024us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 2,064us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Tax Credit Funds 277all_TaxCreditFunds  
Equity method limited partnerships    
Limited partnerships    
Limited partnership interests 1,520us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityMethodInvestmentsMember
1,460us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityMethodInvestmentsMember
Cost method limited partnership interests    
Limited partnerships    
Limited partnership interests 508us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
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605us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
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Investment grade fixed income securities    
Other details of unrealized loss    
Unrealized losses related to securities with unrealized loss position less than 20% of amortized cost or cost 79all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfLessThanTwentyPercent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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Unrealized losses related to securities with unrealized loss position greater than or equal to 20% of amortized cost or 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 amortized cost or cost 29all_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 amortized cost or cost $ 1all_AvailableForSaleSecuritiesUnrealizedLossesHavingLossOfTwentyPercentOrHigher
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember