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Fair Value of Assets and Liabilities (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Quantitative information about the significant unobservable inputs    
Fair value $ 2us-gaap_LiabilitiesFairValueDisclosure $ 7us-gaap_LiabilitiesFairValueDisclosure
Significant unobservable inputs (Level 3)    
Quantitative information about the significant unobservable inputs    
Assets, Fair Value Disclosure 1,077us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 1,635us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueInputsLevel3Member
Fair value (332)us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 (11,655)us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Significant unobservable inputs (Level 3) | Derivatives embedded in life and annuity contracts – Equity-indexed and forward starting options | Stochastic cash flow model    
Quantitative information about the significant unobservable inputs    
Fair value (278)us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
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Weighted average projected option cost (as a percent) 1.76%all_FairValueInputsWeightedAverageProjectedOptionCost
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= all_StochasticCashFlowValuationTechniqueMember		 1.91%all_FairValueInputsWeightedAverageProjectedOptionCost
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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= all_StochasticCashFlowValuationTechniqueMember
Significant unobservable inputs (Level 3) | Derivatives embedded in life and annuity contracts – Equity-indexed and forward starting options | Maximum | Stochastic cash flow model    
Quantitative information about the significant unobservable inputs    
Projected option cost (as a percent) 2.00%all_FairValueInputsProjectedOptionCost
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= all_StochasticCashFlowValuationTechniqueMember		 2.00%all_FairValueInputsProjectedOptionCost
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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= all_StochasticCashFlowValuationTechniqueMember
Significant unobservable inputs (Level 3) | Derivatives embedded in life and annuity contracts – Equity-indexed and forward starting options | Minimum | Stochastic cash flow model    
Quantitative information about the significant unobservable inputs    
Projected option cost (as a percent) 1.00%all_FairValueInputsProjectedOptionCost
/ us-gaap_FairValueByAssetClassAxis
= all_EmbeddedDerivativeEquityIndexedAndForwardStartingOptionsInLifeAndAnnuityProductContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= all_StochasticCashFlowValuationTechniqueMember		 1.00%all_FairValueInputsProjectedOptionCost
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Significant unobservable inputs (Level 3) | Derivatives embedded in life and annuity contracts – Equity-indexed and forward starting options | Discounted cash flow model    
Quantitative information about the significant unobservable inputs    
Fair value   (247)us-gaap_LiabilitiesFairValueDisclosure
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Weighted average projected option cost (as a percent)   1.75%all_FairValueInputsWeightedAverageProjectedOptionCost
/ us-gaap_FairValueByAssetClassAxis
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Significant unobservable inputs (Level 3) | Fixed income securities - non-binding broker quotes    
Quantitative information about the significant unobservable inputs    
Assets, Fair Value Disclosure 914us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= all_FixedIncomeSecuritiesValuedBasedOnNonbindingBrokerQuotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 1,150us-gaap_AssetsFairValueDisclosure
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair value $ 319us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Significant unobservable inputs (Level 3) | Liabilities held for sale | Maximum | Stochastic cash flow model    
Quantitative information about the significant unobservable inputs    
Projected option cost (as a percent)   2.00%all_FairValueInputsProjectedOptionCost
/ us-gaap_FairValueByAssetClassAxis
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
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Significant unobservable inputs (Level 3) | Liabilities held for sale | Minimum | Stochastic cash flow model    
Quantitative information about the significant unobservable inputs    
Projected option cost (as a percent)   1.00%all_FairValueInputsProjectedOptionCost
/ us-gaap_FairValueByAssetClassAxis
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