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General (Details)
Dec. 31, 2014
item
Allstate Protection  
Nature of Operations  
Premiums earned by Allstate Protection segment as a percentage of consolidated revenue 82.00%all_PremiumEarnedAsPercentageOfConsolidatedRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllStateProtectionMember
Number of states in which entity is authorized to operate 50us-gaap_NumberOfStatesInWhichEntityOperates
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllStateProtectionMember
Minimum percentage of premiums from one jurisdiction to be considered as significant 5.00%all_MinimumPercentageOfPremiumsToBeConsideredAsSignificant
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllStateProtectionMember
Allstate Financial  
Nature of Operations  
Number of states in which entity is authorized to operate 50us-gaap_NumberOfStatesInWhichEntityOperates
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Minimum percentage of premiums from one jurisdiction to be considered as significant 5.00%all_MinimumPercentageOfPremiumsToBeConsideredAsSignificant
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember