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Goodwill Level 4 (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
segments
Goodwill [Line Items]          
Gross   $ 853,000,000us-gaap_GoodwillGross     $ 853,000,000us-gaap_GoodwillGross
Goodwill, Impaired, Accumulated Impairment Loss   (355,000,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss     (355,000,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Carrying Value 498,000,000us-gaap_Goodwill 498,000,000us-gaap_Goodwill 498,000,000us-gaap_Goodwill   498,000,000us-gaap_Goodwill
Goodwill, Written off Related to Sale of Business Unit 156us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit        
Finite-Lived Intangible Assets, Amortization Expense, Year Two   6,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo     6,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Finite-Lived Intangible Assets, Amortization Expense, Year Three   6,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree     6,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Finite-Lived Intangible Assets, Amortization Expense, Year Four   6,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour     6,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Finite-Lived Intangible Assets, Amortization Expense, Year Five   6,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive     6,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Group Benefits [Member]          
Goodwill [Line Items]          
Goodwill impairment loss   0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hig_GroupBenefitsMember		 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hig_GroupBenefitsMember		    
Annual impairment test margin, percent   10.00%hig_AnnualImpairmentTestMarginPercent
/ us-gaap_StatementBusinessSegmentsAxis
= hig_GroupBenefitsMember		     10.00%hig_AnnualImpairmentTestMarginPercent
/ us-gaap_StatementBusinessSegmentsAxis
= hig_GroupBenefitsMember
Corporate Segment [Member]          
Goodwill [Line Items]          
Goodwill impairment loss     0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		    
Property and Casualty, Personal Insurance Product Line [Member]          
Goodwill [Line Items]          
Gross   119,000,000us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyPersonalInsuranceProductLineMember		     119,000,000us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyPersonalInsuranceProductLineMember
Goodwill, Impaired, Accumulated Impairment Loss   0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyPersonalInsuranceProductLineMember		     0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyPersonalInsuranceProductLineMember
Carrying Value   119,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyPersonalInsuranceProductLineMember		     119,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyPersonalInsuranceProductLineMember
Goodwill impairment loss   0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyPersonalInsuranceProductLineMember		      
Mutual Funds [Member]          
Goodwill [Line Items]          
Gross   149,000,000us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= hig_MutualFundsMember		     149,000,000us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= hig_MutualFundsMember
Goodwill, Impaired, Accumulated Impairment Loss   0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hig_MutualFundsMember		     0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hig_MutualFundsMember
Carrying Value   149,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hig_MutualFundsMember		     149,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hig_MutualFundsMember
Goodwill impairment loss   0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hig_MutualFundsMember		      
Individual Life [Member]          
Goodwill [Line Items]          
Goodwill impairment loss 342,000,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hig_IndividualLifeMember		   0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hig_IndividualLifeMember		 342us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hig_IndividualLifeMember		  
Retirement Plans [Member]          
Goodwill [Line Items]          
Goodwill impairment loss     0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hig_RetirementPlansMember		   0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hig_RetirementPlansMember
Annual impairment test margin, percent   10.00%hig_AnnualImpairmentTestMarginPercent
/ us-gaap_StatementBusinessSegmentsAxis
= hig_RetirementPlansMember		     10.00%hig_AnnualImpairmentTestMarginPercent
/ us-gaap_StatementBusinessSegmentsAxis
= hig_RetirementPlansMember
Number of Company Reporting Segments which completed interim impairment test   2hig_NumberOfCompanyReportingSegmentsWhichCompletedInterimImpairmentTest
/ us-gaap_StatementBusinessSegmentsAxis
= hig_RetirementPlansMember		     2hig_NumberOfCompanyReportingSegmentsWhichCompletedInterimImpairmentTest
/ us-gaap_StatementBusinessSegmentsAxis
= hig_RetirementPlansMember
Corporate [Member]          
Goodwill [Line Items]          
Gross   585,000,000us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		     585,000,000us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Goodwill, Impaired, Accumulated Impairment Loss   (355,000,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 [1]     (355,000,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 [1]
Carrying Value   230,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		     230,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Group Benefits [Member]          
Goodwill [Line Items]          
Carrying Value   138,000,000us-gaap_Goodwill
/ hig_ReportingUnitAxis
= hig_GroupBenefitsMember		     138,000,000us-gaap_Goodwill
/ hig_ReportingUnitAxis
= hig_GroupBenefitsMember
Mutual Funds [Member]          
Goodwill [Line Items]          
Carrying Value   $ 92,000,000us-gaap_Goodwill
/ hig_ReportingUnitAxis
= hig_MutualFundsMember		     $ 92,000,000us-gaap_Goodwill
/ hig_ReportingUnitAxis
= hig_MutualFundsMember
[1] Carrying value as of December 31, 2014 and 2013 includes $138 and $92 for the Group Benefits and Mutual Funds reporting units, respectively.