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Investments and Derivative Instruments Level 4 Investment Income (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investment Income [Line Items]        
Derivative, Gain (Loss) on Derivative, Net $ (353,000,000)us-gaap_DerivativeGainLossOnDerivativeNet $ (125,000,000)us-gaap_DerivativeGainLossOnDerivativeNet $ 105,000,000us-gaap_DerivativeGainLossOnDerivativeNet  
Net Investment Income [Abstract]        
Net Investment Income 3,154,000,000us-gaap_NetInvestmentIncome 3,264,000,000us-gaap_NetInvestmentIncome 4,127,000,000us-gaap_NetInvestmentIncome  
Investment Income, Investment Expense (122,000,000)us-gaap_InvestmentIncomeInvestmentExpense (115,000,000)us-gaap_InvestmentIncomeInvestmentExpense (105,000,000)us-gaap_InvestmentIncomeInvestmentExpense  
Net Realized Capital Gains (Losses) Table [Abstract]        
Gain on Derivative Instruments, Pretax 527,000,000us-gaap_GainOnDerivativeInstrumentsPretax 2,313,000,000us-gaap_GainOnDerivativeInstrumentsPretax 801,000,000us-gaap_GainOnDerivativeInstrumentsPretax  
Loss on Derivative Instruments, Pretax 250,000,000us-gaap_LossOnDerivativeInstrumentsPretax 659,000,000us-gaap_LossOnDerivativeInstrumentsPretax 420,000,000us-gaap_LossOnDerivativeInstrumentsPretax  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 59,000,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 73,000,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 349,000,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet  
Periodic Net Coupon Settlements on Credit Derivatives 1,000,000hig_PeriodicNetCouponSettlementsOnCreditDerivatives (8,000,000)hig_PeriodicNetCouponSettlementsOnCreditDerivatives (18,000,000)hig_PeriodicNetCouponSettlementsOnCreditDerivatives  
Other Net Realized Capital Gains Losses (193,000,000)hig_OtherNetRealizedCapitalGainsLosses 198,000,000hig_OtherNetRealizedCapitalGainsLosses 290,000,000hig_OtherNetRealizedCapitalGainsLosses  
Realized Investment Gains (Losses) 16,000,000us-gaap_RealizedInvestmentGainsLosses 1,798,000,000us-gaap_RealizedInvestmentGainsLosses 497,000,000us-gaap_RealizedInvestmentGainsLosses  
Net Realized Capital Gains (Losses) Footnote [Abstract]        
Gain (Loss) on Investments, Excluding Other than Temporary Impairments 75,000,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments 296,000,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments 846,000,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status 0us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus 2,000,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus 0us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus  
Sale of Available-for-sale Securities [Abstract]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held 424,000,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld 552,000,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld 1,013,000,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld 1,676,000,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
Fixed Maturities [Member]        
Net Investment Income [Abstract]        
Net Investment Income 2,420,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember		 [1] 2,552,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember		 [1] 3,299,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember		  
Equity Securities [Member]        
Net Investment Income [Abstract]        
Net Investment Income 38,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		 30,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		 36,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		  
Mortgage Loans on Real Estate [Member]        
Net Investment Income [Abstract]        
Net Investment Income 265,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageLoansOnRealEstateMember		 260,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageLoansOnRealEstateMember		 334,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageLoansOnRealEstateMember		  
Policy Loans [Member]        
Net Investment Income [Abstract]        
Net Investment Income 80,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_PolicyLoansMember		 83,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_PolicyLoansMember		 119,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_PolicyLoansMember		  
Limited Partnerships and Other Alternative Investments [Member]        
Net Investment Income [Abstract]        
Net Investment Income 294,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= hig_LimitedPartnershipsAndOtherAlternativeInvestmentsMember		 287,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= hig_LimitedPartnershipsAndOtherAlternativeInvestmentsMember		 196,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= hig_LimitedPartnershipsAndOtherAlternativeInvestmentsMember		  
Other Investments [Member]        
Net Investment Income [Abstract]        
Net Investment Income 179,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherInvestmentsMember		 [2] 167,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherInvestmentsMember		 [2] 248,000,000us-gaap_NetInvestmentIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherInvestmentsMember		  
Mortgage Loans on Real Estate [Member]        
Net Realized Capital Gains (Losses) Table [Abstract]        
Valuation Allowances and Reserves, Adjustments 4,000,000us-gaap_ValuationAllowancesAndReservesAdjustments
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_MortgageLoansOnRealEstateMember		 1,000,000us-gaap_ValuationAllowancesAndReservesAdjustments
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_MortgageLoansOnRealEstateMember		 (14,000,000)us-gaap_ValuationAllowancesAndReservesAdjustments
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_MortgageLoansOnRealEstateMember		  
UNITED STATES | Macro Hedge Program [Member]        
Net Realized Capital Gains (Losses) Table [Abstract]        
Gain (Loss) on Hedging Activity (11,000,000)us-gaap_GainLossOnOilAndGasHedgingActivity
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= hig_MacroHedgeProgramMember		 (234,000,000)us-gaap_GainLossOnOilAndGasHedgingActivity
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= hig_MacroHedgeProgramMember		 (340,000,000)us-gaap_GainLossOnOilAndGasHedgingActivity
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= hig_MacroHedgeProgramMember		  
UNITED STATES | GMWB Derivatives, Net [Member]        
Net Realized Capital Gains (Losses) Table [Abstract]        
Gain (Loss) on Hedging Activity 5,000,000us-gaap_GainLossOnOilAndGasHedgingActivity
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= hig_GmwbDerivativesNetMember		 262,000,000us-gaap_GainLossOnOilAndGasHedgingActivity
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= hig_GmwbDerivativesNetMember		 519,000,000us-gaap_GainLossOnOilAndGasHedgingActivity
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= hig_GmwbDerivativesNetMember		  
UNITED STATES | Variable Annuity [Member]        
Net Realized Capital Gains (Losses) Table [Abstract]        
Gain (Loss) on Hedging Activity (6,000,000)us-gaap_GainLossOnOilAndGasHedgingActivity
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= us-gaap_VariableAnnuityMember		 28,000,000us-gaap_GainLossOnOilAndGasHedgingActivity
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= us-gaap_VariableAnnuityMember		 179,000,000us-gaap_GainLossOnOilAndGasHedgingActivity
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= us-gaap_VariableAnnuityMember		  
Retirement Plans and Individual Life Businesses [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Net Realized Capital Gains (Losses) Footnote [Abstract]        
Gain (Loss) on Investments, Excluding Other than Temporary Impairments 1,500,000,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
/ us-gaap_StatementBusinessSegmentsAxis
= hig_RetirementPlansAndIndividualLifeBusinessesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 1,500,000,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
/ us-gaap_StatementBusinessSegmentsAxis
= hig_RetirementPlansAndIndividualLifeBusinessesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		    
Business Disposition [Member]        
Net Realized Capital Gains (Losses) Footnote [Abstract]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status 177,000,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus
/ us-gaap_ProductOrServiceAxis
= hig_BusinessDispositionMember		      
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Net Realized Capital Gains (Losses) Footnote [Abstract]        
Gain (Loss) on Investments, Excluding Other than Temporary Impairments 217,000,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 1,515,000,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 32,000,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Equity Securities [Member]        
Sale of Available-for-sale Securities [Abstract]        
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds 354,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 274,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 295,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		  
Available-for-sale Securities, Gross Realized Gains 22,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 96,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 34,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		  
Available-for-sale Securities, Gross Realized Losses (20,000,000)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 (6,000,000)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 (20,000,000)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		  
Debt Securities [Member]        
Sale of Available-for-sale Securities [Abstract]        
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds 22,923,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 39,225,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 41,442,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Available-for-sale Securities, Gross Realized Gains 456,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 2,143,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 825,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Available-for-sale Securities, Gross Realized Losses (182,000,000)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 (645,000,000)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		 (399,000,000)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Retirement Plans and Individual Life Businesses [Member]        
Investment Income [Line Items]        
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal   71us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hig_RetirementPlansAndIndividualLifeBusinessesMember		 110us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hig_RetirementPlansAndIndividualLifeBusinessesMember		  
Three Win Related Foreign Currency Swaps [Member] | JAPAN        
Net Realized Capital Gains (Losses) Footnote [Abstract]        
Associated Liability Adjusted for Changes in Spot Rates Through Realized Capital Gain 116,000,000hig_AssociatedLiabilityAdjustedForChangesInSpotRatesThroughRealizedCapitalGain
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_ThreeWinRelatedForeignCurrencySwapsMember
/ invest_InvestmentGeographicRegionAxis
= country_JP		 250,000,000hig_AssociatedLiabilityAdjustedForChangesInSpotRatesThroughRealizedCapitalGain
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_ThreeWinRelatedForeignCurrencySwapsMember
/ invest_InvestmentGeographicRegionAxis
= country_JP		 189,000,000hig_AssociatedLiabilityAdjustedForChangesInSpotRatesThroughRealizedCapitalGain
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_ThreeWinRelatedForeignCurrencySwapsMember
/ invest_InvestmentGeographicRegionAxis
= country_JP		  
Fixed Annuity Hedging Instruments [Member] | JAPAN        
Investment Income [Line Items]        
Derivative, Gain (Loss) on Derivative, Net $ (148,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_FixedAnnuityHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_JP		 $ (268,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_FixedAnnuityHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_JP		 $ (300,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_FixedAnnuityHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_JP		 [3]  
[1] Includes net investment income on short-term investments.
[2] Includes income from derivatives that hedge fixed maturities and qualify for hedge accounting.
[3] The associated liability is adjusted for changes in spot rates through realized capital gains and was $116, $250 and $189 for the years ended December 31, 2014, 2013 and 2012, respectively