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Reinsurance (Details) (USD $)
 12 Months Ended 45 Months Ended 106 Months Ended 1 Months Ended 33 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2011
Jun. 30, 2007
Aug. 31, 1998
Dec. 31, 2013
Reinsurance recoverable              
Number of unaffiliated reinsurers 14all_UnaffiliatedReinsurers            
Retention level for most contracts       $ 5,000,000all_ReinsuranceRetentionLevel $ 2,000,000all_ReinsuranceRetentionLevel    
Retention level for contracts issued to individuals age 70 and over       3,000,000all_ReinsuranceRetentionLevelAge70      
Retention level for certain large contracts meeting specific criteria       10,000,000all_ReinsuranceRetentionLevelSpecificCriteria 5,000,000all_ReinsuranceRetentionLevelSpecificCriteria    
Total amounts recoverable from reinsurers, industry pools or facilities 2,586,000,000us-gaap_ReinsuranceRecoverables 2,754,000,000us-gaap_ReinsuranceRecoverables         2,754,000,000us-gaap_ReinsuranceRecoverables
Interest credited to contractholder funds, reinsurance ceded 27,000,000all_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalances 27,000,000all_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalances 28,000,000all_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalances        
Gross life insurance in force 424,340,000,000all_GrossLifeInsuranceInForce            
Life insurance in force ceded to unaffiliated reinsurers 97,574,000,000us-gaap_LifeInsuranceInForceCeded 195,414,000,000us-gaap_LifeInsuranceInForceCeded 208,967,000,000us-gaap_LifeInsuranceInForceCeded       195,414,000,000us-gaap_LifeInsuranceInForceCeded
Maximum              
Reinsurance recoverable              
Percent of morbidity risk ceded for term-life insurance policies 90.00%all_MorbidityRiskCededTermLifeInsurancePercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		            
Retention level for most contracts           1,000,000all_ReinsuranceRetentionLevel
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Prudential              
Reinsurance recoverable              
Total amounts recoverable from reinsurers, industry pools or facilities 1,460,000,000us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		 1,510,000,000us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		         1,510,000,000us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember
Life and annuity premiums and contract charges, reinsurance ceded 109,000,000all_CededLifeAndAnnuityPremiumsAndContractCharges
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		 120,000,000all_CededLifeAndAnnuityPremiumsAndContractCharges
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		 128,000,000all_CededLifeAndAnnuityPremiumsAndContractCharges
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		        
Life and annuity contract benefits, reinsurance ceded 36,000,000all_ReinsuranceCededLifeAndAnnuityContractBenefits
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		 139,000,000all_ReinsuranceCededLifeAndAnnuityContractBenefits
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		 91,000,000all_ReinsuranceCededLifeAndAnnuityContractBenefits
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		        
Interest credited to contractholder funds, reinsurance ceded 21,000,000all_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalances
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		 22,000,000all_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalances
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		 23,000,000all_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalances
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		        
Operating costs and expenses, reinsurance ceded 20,000,000all_ReinsuranceCededOperatingCostsAndExpenses
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		 23,000,000all_ReinsuranceCededOperatingCostsAndExpenses
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		 25,000,000all_ReinsuranceCededOperatingCostsAndExpenses
/ us-gaap_CededCreditRiskAxis
= all_PrudentialMember		        
Citigroup Subsidiaries and Scottish Re              
Reinsurance recoverable              
Total amounts recoverable from reinsurers, industry pools or facilities 157,000,000us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= all_CitigroupAndScottishReMember		 156,000,000us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= all_CitigroupAndScottishReMember		         156,000,000us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= all_CitigroupAndScottishReMember
Single life              
Reinsurance recoverable              
Retention level for most contracts             5,000,000all_ReinsuranceRetentionLevel
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_SingleLifeInsuranceMember
Retention level for contracts issued to individuals age 70 and over             3,000,000all_ReinsuranceRetentionLevelAge70
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_SingleLifeInsuranceMember
Retention level for certain large contracts meeting specific criteria             10,000,000all_ReinsuranceRetentionLevelSpecificCriteria
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_SingleLifeInsuranceMember
Joint life              
Reinsurance recoverable              
Retention level for most contracts             8,000,000all_ReinsuranceRetentionLevel
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_JointLifeInsuranceMember
Retention level for certain large contracts meeting specific criteria             $ 10,000,000all_ReinsuranceRetentionLevelSpecificCriteria
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= all_JointLifeInsuranceMember