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Reporting Segments (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information      
Assets $ 108,533us-gaap_Assets $ 123,520us-gaap_Assets $ 126,947us-gaap_Assets
Investments 81,113us-gaap_Investments 81,155us-gaap_Investments 97,278us-gaap_Investments
Property-Liability      
Segment Reporting Information      
Assets 55,767us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember		 54,726us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember		 52,201us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
Investments 39,083us-gaap_Investments
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember		 39,638us-gaap_Investments
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember		 38,215us-gaap_Investments
/ us-gaap_StatementBusinessSegmentsAxis
= all_PropertyLiabilityMember
Allstate Financial      
Segment Reporting Information      
Assets 49,248us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember		 65,707us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember		 72,368us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Investments 38,809us-gaap_Investments
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember		 39,105us-gaap_Investments
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember		 56,999us-gaap_Investments
/ us-gaap_StatementBusinessSegmentsAxis
= all_AllstateFinancialMember
Corporate and Other      
Segment Reporting Information      
Assets 3,518us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 3,087us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 2,378us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Investments $ 3,221us-gaap_Investments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ 2,412us-gaap_Investments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ 2,064us-gaap_Investments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember