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Investments and Derivative Instruments Level 4 Non-qualifying Strategies for Hedge Accounting (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Derivative, Notional Amount $ 71,313,000,000invest_DerivativeNotionalAmount   $ 72,850,000,000invest_DerivativeNotionalAmount
Derivative, Fair Value, Net (555,000,000)us-gaap_DerivativeFairValueOfDerivativeNet   (639,000,000)us-gaap_DerivativeFairValueOfDerivativeNet
Disposal Group, Assets of Business Transferred under Contractual Arrangement 1,000,000,000us-gaap_DisposalGroupAssetsOfBusinessTransferredUnderContractualArrangement   1,000,000,000us-gaap_DisposalGroupAssetsOfBusinessTransferredUnderContractualArrangement
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (36,000,000)us-gaap_DerivativeGainLossOnDerivativeNet [1] (64,000,000)us-gaap_DerivativeGainLossOnDerivativeNet [1]  
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) Footnote [Abstract]      
Recovery of previous counterparty losses 0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery 7,000,000us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery  
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 1,100,000,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral   1,100,000,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]      
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (11,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_CoinsuranceAndModifiedCoinsuranceReinsuranceContractsMember		 (19,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_CoinsuranceAndModifiedCoinsuranceReinsuranceContractsMember		  
Interest Rate Swaps Caps Floors and Futures [Member]      
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (12,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_InterestRateSwapsCapsFloorsAndFuturesMember		 (57,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_InterestRateSwapsCapsFloorsAndFuturesMember		  
Interest Rate Swap [Member]      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Derivative, Notional Amount 13,100,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		   13,100,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Foreign Currency Swaps and Forwards [Member]      
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net 7,000,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_ForeignCurrencySwapsAndForwardsMember		 (2,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_ForeignCurrencySwapsAndForwardsMember		  
Credit Derivatives that Purchase Credit Protection [Member]      
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (2,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_CreditDerivativesThatPurchaseCreditProtectionMember		 (4,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_CreditDerivativesThatPurchaseCreditProtectionMember		  
Credit Derivatives that Assume Credit Risk [Member]      
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net 9,000,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_CreditDerivativesThatAssumeCreditRiskMember		 (1,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_CreditDerivativesThatAssumeCreditRiskMember		  
Equity Index Swaps and Options [Member]      
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (3,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_EquityIndexSwapsAndOptionsMember		 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_EquityIndexSwapsAndOptionsMember		  
Commodity Option [Member]      
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (5,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityOptionMember		 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityOptionMember		  
Contingent Capital Facility Put Option [Member]      
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (2,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_ContingentCapitalFacilityPutOptionMember		 (1,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_ContingentCapitalFacilityPutOptionMember		  
Commodity Option [Member]      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Derivative, Notional Amount 582,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember		   0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember
Derivative, Fair Value, Net 10,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember		   0us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) Footnote [Abstract]      
Derivative, Cost of Hedge 11,000,000us-gaap_DerivativeCostOfHedge
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember		    
Derivative, Forward Price 35us-gaap_DerivativePriceRiskOptionStrikePrice
/ us-gaap_DerivativeByNatureAxis
= us-gaap_CommodityOptionMember		    
Contingent Capital Facility Put Option [Member]      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Derivative, Notional Amount 500,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_ContingentCapitalFacilityPutOptionMember		   500,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_ContingentCapitalFacilityPutOptionMember
Derivative, Fair Value, Net 11,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_ContingentCapitalFacilityPutOptionMember		   12,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_ContingentCapitalFacilityPutOptionMember
Maximum Aggregate Principal Amount of Junior Subordinated Notes 500,000,000hig_MaximumAggregatePrincipalAmountOfJuniorSubordinatedNotes
/ us-gaap_DerivativeByNatureAxis
= hig_ContingentCapitalFacilityPutOptionMember		    
UNITED STATES | GMWB Hedging Instruments [Member]      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Derivative, Notional Amount 12,179,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   14,442,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US
Derivative, Fair Value, Net 181,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   174,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net 13,000,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US		 (17,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US		  
UNITED STATES | GMWB Product Derivatives [Member]      
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (19,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbProductDerivativesMember
/ invest_InvestmentGeographicRegionAxis
= country_US		 36,000,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbProductDerivativesMember
/ invest_InvestmentGeographicRegionAxis
= country_US		  
UNITED STATES | GMWB Reinsurance [Member]      
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net 7,000,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbReinsuranceMember
/ invest_InvestmentGeographicRegionAxis
= country_US		 (4,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbReinsuranceMember
/ invest_InvestmentGeographicRegionAxis
= country_US		  
UNITED STATES | Macro Hedge Program [Member]      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Derivative, Notional Amount 7,742,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_MacroHedgeProgramMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   6,383,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_MacroHedgeProgramMember
/ invest_InvestmentGeographicRegionAxis
= country_US
Derivative, Fair Value, Net 187,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_MacroHedgeProgramMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   141,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_MacroHedgeProgramMember
/ invest_InvestmentGeographicRegionAxis
= country_US
UNITED STATES | Macro Hedge Program [Member]      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Derivative, Notional Amount 7,742,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   6,383,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ invest_InvestmentGeographicRegionAxis
= country_US
Derivative, Fair Value, Net 187,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   141,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ invest_InvestmentGeographicRegionAxis
= country_US
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (4,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ invest_InvestmentGeographicRegionAxis
= country_US		 (10,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ invest_InvestmentGeographicRegionAxis
= country_US		  
UNITED STATES | Macro Hedge Program [Member] | Equity Option [Member]      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Derivative, Notional Amount 7,342,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   5,983,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember
/ invest_InvestmentGeographicRegionAxis
= country_US
Derivative, Fair Value, Net 187,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   141,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember
/ invest_InvestmentGeographicRegionAxis
= country_US
UNITED STATES | Customized Swaps [Member] | GMWB Hedging Instruments [Member]      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Derivative, Notional Amount 6,806,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_CustomizedSwapsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   7,041,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_CustomizedSwapsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US
Derivative, Fair Value, Net 144,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_CustomizedSwapsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   124,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_CustomizedSwapsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US
UNITED STATES | Equity Swaps, Options and Futures [Member] | GMWB Hedging Instruments [Member]      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Derivative, Notional Amount 1,803,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_EquitySwapsOptionsAndFuturesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   3,761,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_EquitySwapsOptionsAndFuturesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US
Derivative, Fair Value, Net 11,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_EquitySwapsOptionsAndFuturesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   39,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_EquitySwapsOptionsAndFuturesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US
UNITED STATES | Interest Rate Swaps and Futures [Member] | GMWB Hedging Instruments [Member]      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Derivative, Notional Amount 3,570,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_InterestRateSwapsAndFuturesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   3,640,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_InterestRateSwapsAndFuturesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US
Derivative, Fair Value, Net 26,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_InterestRateSwapsAndFuturesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US		   11,000,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_InterestRateSwapsAndFuturesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_GmwbHedgingInstrumentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US
JAPAN | Three Win Related Foreign Currency Swaps [Member]      
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) [Abstract]      
Derivative, Gain (Loss) on Derivative, Net (14,000,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_ThreeWinRelatedForeignCurrencySwapsMember
/ invest_InvestmentGeographicRegionAxis
= country_JP		 [2] 15,000,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_ThreeWinRelatedForeignCurrencySwapsMember
/ invest_InvestmentGeographicRegionAxis
= country_JP		 [2]  
Gain (Loss) Recognized within Net Realized Capital Gains (Losses) Footnote [Abstract]      
Associated Liability Adjusted for Changes in Spot Rates Through Realized Capital Gain 0hig_AssociatedLiabilityAdjustedForChangesInSpotRatesThroughRealizedCapitalGain
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_ThreeWinRelatedForeignCurrencySwapsMember
/ invest_InvestmentGeographicRegionAxis
= country_JP		 (28,000,000)hig_AssociatedLiabilityAdjustedForChangesInSpotRatesThroughRealizedCapitalGain
/ us-gaap_DerivativeInstrumentRiskAxis
= hig_ThreeWinRelatedForeignCurrencySwapsMember
/ invest_InvestmentGeographicRegionAxis
= country_JP		  
JAPAN | Macro Hedge Program [Member] | Foreign Exchange Option [Member]      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Derivative, Notional Amount 400,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeOptionMember
/ invest_InvestmentGeographicRegionAxis
= country_JP		   400,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeOptionMember
/ invest_InvestmentGeographicRegionAxis
= country_JP
Derivative, Fair Value, Net 0us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeOptionMember
/ invest_InvestmentGeographicRegionAxis
= country_JP		   0us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hig_MacroHedgeProgramMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeOptionMember
/ invest_InvestmentGeographicRegionAxis
= country_JP
GMWB Derivatives, Net [Member] | UNITED STATES      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Results of Variable Annuity Hedge Program, Gain (Loss) 1,000,000hig_ResultsofVariableAnnuityHedgeProgramGainLoss
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= hig_GmwbDerivativesNetMember		 15,000,000hig_ResultsofVariableAnnuityHedgeProgramGainLoss
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= hig_GmwbDerivativesNetMember		  
Macro Hedge Program [Member] | UNITED STATES      
Non-qualifying Strategies for Hedge Accounting [Line Items]      
Results of Variable Annuity Hedge Program, Gain (Loss) $ (4,000,000)hig_ResultsofVariableAnnuityHedgeProgramGainLoss
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= hig_MacroHedgeProgramMember		 $ (10,000,000)hig_ResultsofVariableAnnuityHedgeProgramGainLoss
/ invest_InvestmentGeographicRegionAxis
= country_US
/ hig_ResultsOfVariableAnnuityHedgeProgramByDerivativeInstrumentRiskAxis
= hig_MacroHedgeProgramMember		  
[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmIyYjlhMjQ0ZjBjZjRkMGFhYTI0ZWQwYjhiNWZiMWZhfFRleHRTZWxlY3Rpb246OUFCN0I5MzZBMTVCNTFBNEFGNkRCQkUwOTFDQzA5QTYM}
[2] he associated liability adjustment for changes in foreign exchange spot rates through realized capital gains of $0 and $(28) for the three months ended March 31, 2015 and 2014, respectively