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Investments and Derivative Instruments Level 4 Mortgage Loans (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Mortgage Loans [Line Items]      
Repurchase Agreements, Collateral, Policy [Policy Text Block]
As part of repurchase agreements and dollar roll transactions, the Company transfers collateral of U.S. government and government agency securities and receives cash. For the repurchase agreements, the Company obtains cash in an amount equal to at least 95% of the fair value of the securities transferred. The agreements contain contractual provisions that require additional collateral to be transferred when necessary and provide the counterparty the right to sell or re-pledge the securities transferred. The cash received from the repurchase program is typically invested in short-term investments or fixed maturities. Repurchase agreements include master netting provisions that provide the counterparties the right to offset claims and apply securities held by them with respect to their obligations in the event of a default. Although the Company has the contractual right to offset claims, fixed maturities do not meet the specific conditions for net presentation under U.S. GAAP. The Company accounts for the repurchase agreements and dollar roll transactions as collateralized borrowings. The securities transferred under repurchase agreements and dollar roll transactions are included in fixed maturities, AFS with the obligation to repurchase those securities recorded in other liabilities on the Company's Condensed Consolidated Balance Sheets.
   
Mortgage Loans on Real Estate [Abstract]      
Available-for-sale Securities, Amortized Cost Basis $ 56,830,000,000us-gaap_AvailableForSaleSecuritiesAmortizedCost   $ 56,038,000,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 5,697,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages   5,556,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan 57.00%hig_CurrentWeightedAverageLoanToValueRatioOfCommercialMortgageLoan    
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan 62.00%hig_OriginalWeightedAverageLoanToValueRatioOfCommercialMortgageLoan    
Commercial Mortgage Loans Credit Quality [Abstract]      
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio 2.51hig_AverageDebtServiceCoverageRatio    
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 100.00%hig_AvailableForSaleSecuritiesMortgageLoansPercent   100.00%hig_AvailableForSaleSecuritiesMortgageLoansPercent
Agricultural [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 46,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_AgriculturalMember		   46,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_AgriculturalMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 0.80%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_AgriculturalMember		   0.80%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_AgriculturalMember
Commercial Loan [Member]      
Mortgage Loans [Line Items]      
Allowance for Loan and Lease Losses, Period Increase (Decrease) 3,000,000us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		 0us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		  
Mortgage Loans on Real Estate [Abstract]      
Available-for-sale Securities, Amortized Cost Basis 5,718,000,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		 [1]   5,574,000,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		 [1]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 5,697,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		   5,556,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Balance, beginning of period 18,000,000us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		 67,000,000us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		  
Balance, end of period 21,000,000us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		 17,000,000us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		  
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans     1hig_MortgageLoansonCommercialNumberofDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember
Commercial Mortgage Loans Credit Quality [Abstract]      
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio 2.51hig_AverageDebtServiceCoverageRatio
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		   2.51hig_AverageDebtServiceCoverageRatio
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember
Mortgage Loans by Region/Property Type [Abstract]      
Allowance for Loan and Lease Losses, Write-offs 0us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		 50,000,000us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		  
Industrial Property [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 1,465,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_IndustrialPropertyMember		   1,476,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_IndustrialPropertyMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 25.70%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_IndustrialPropertyMember		   26.60%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_IndustrialPropertyMember
Lodging [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 26,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_LodgingMember		   26,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_LodgingMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 0.50%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_LodgingMember		   0.50%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_LodgingMember
Multifamily [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 1,267,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_MultifamilyMember		   1,190,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_MultifamilyMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 22.20%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_MultifamilyMember		   21.40%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_MultifamilyMember
Office [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 1,538,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_OfficeMember		   1,517,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_OfficeMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 27.00%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_OfficeMember		   27.30%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_OfficeMember
Retail [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 1,204,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_RetailMember		   1,147,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_RetailMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 21.10%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_RetailMember		   20.60%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_RetailMember
Other Property Type Mortgage [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 151,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_OtherPropertyTypeMortgageMember		   154,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_OtherPropertyTypeMortgageMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 2.70%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_OtherPropertyTypeMortgageMember		   2.80%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= hig_OtherPropertyTypeMortgageMember
LTV Greater Than 80% [Member] | Commercial Loan [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 49,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ hig_LoantoValueRatioAxis
= hig_LTVGreaterThan80Member
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		   53,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ hig_LoantoValueRatioAxis
= hig_LTVGreaterThan80Member
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember
Commercial Mortgage Loans Credit Quality [Abstract]      
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio 1.12hig_AverageDebtServiceCoverageRatio
/ hig_LoantoValueRatioAxis
= hig_LTVGreaterThan80Member
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		   1.07hig_AverageDebtServiceCoverageRatio
/ hig_LoantoValueRatioAxis
= hig_LTVGreaterThan80Member
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember
LTV Between 65% to 80% [Member] | Commercial Loan [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 928,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ hig_LoantoValueRatioAxis
= hig_LTVBetween65to80Member
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		   789,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ hig_LoantoValueRatioAxis
= hig_LTVBetween65to80Member
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember
Commercial Mortgage Loans Credit Quality [Abstract]      
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio 1.73hig_AverageDebtServiceCoverageRatio
/ hig_LoantoValueRatioAxis
= hig_LTVBetween65to80Member
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		   1.75hig_AverageDebtServiceCoverageRatio
/ hig_LoantoValueRatioAxis
= hig_LTVBetween65to80Member
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember
LTV Less Than 65% [Member] | Commercial Loan [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 4,720,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ hig_LoantoValueRatioAxis
= hig_LTVLessThan65Member
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		   4,714,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ hig_LoantoValueRatioAxis
= hig_LTVLessThan65Member
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember
Commercial Mortgage Loans Credit Quality [Abstract]      
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio 2.69hig_AverageDebtServiceCoverageRatio
/ hig_LoantoValueRatioAxis
= hig_LTVLessThan65Member
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		   2.66hig_AverageDebtServiceCoverageRatio
/ hig_LoantoValueRatioAxis
= hig_LTVLessThan65Member
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember
East North Central [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 231,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_EastNorthCentralMember		   211,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_EastNorthCentralMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 4.10%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_EastNorthCentralMember		   3.80%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_EastNorthCentralMember
Middle Atlantic [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 452,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_MiddleAtlanticMember		   468,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_MiddleAtlanticMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 7.90%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_MiddleAtlanticMember		   8.40%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_MiddleAtlanticMember
Mountain [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 88,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_MountainMember		   88,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_MountainMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 1.50%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_MountainMember		   0.00%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_MountainMember
New England [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 381,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_NewEnglandMember		   381,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_NewEnglandMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 6.70%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_NewEnglandMember		   6.90%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_NewEnglandMember
Pacific [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 1,646,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_PacificMember		   1,607,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_PacificMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 28.90%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_PacificMember		   29.00%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_PacificMember
South Atlantic [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 1,104,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_SouthAtlanticMember		   1,019,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_SouthAtlanticMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 19.40%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_SouthAtlanticMember		   18.30%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_SouthAtlanticMember
West North Central [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 44,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_WestNorthCentralMember		   44,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_WestNorthCentralMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 0.80%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_WestNorthCentralMember		   0.80%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_WestNorthCentralMember
West South Central [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 319,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_WestSouthCentralMember		   302,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_WestSouthCentralMember
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 5.60%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_WestSouthCentralMember		   5.40%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_WestSouthCentralMember
Region Others [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 1,432,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_RegionOthersMember		 [2]   1,436,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ invest_InvestmentGeographicRegionAxis
= hig_RegionOthersMember		 [2]
Mortgage Loans by Region/Property Type [Abstract]      
Available-for-sale Securities Mortgage Loans Percent 25.10%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_RegionOthersMember		 [2]   25.80%hig_AvailableForSaleSecuritiesMortgageLoansPercent
/ invest_InvestmentGeographicRegionAxis
= hig_RegionOthersMember		 [2]
Allowance for Loan and Lease Losses [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 110,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember		   140,000,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_AllowanceForLoanAndLeaseLossesMember
Assets Held-for-sale [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 0us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= us-gaap_AssetsHeldForSaleMember		    
Mortgage Loans on Real Estate [Member] | Commercial Loan [Member]      
Mortgage Loans by Region/Property Type [Abstract]      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 7,000,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		    
Financing Receivable, Allowance for Credit Losses $ 0us-gaap_FinancingReceivableAllowanceForCreditLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialLoanMember		    
[1] Amortized cost represents carrying value prior to valuation allowances, if any
[2] Primarily represents loans collateralized by multiple properties in various regions.