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Investments and Derivative Instruments Level 4 Mortgage Loans (Details)
6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mortgage Loans [Line Items]        
Servicing Asset     $ 0 $ 0
Loans and Leases Receivable, Allowance [Abstract]        
Available-for-sale Securities, Amortized Cost Basis     57,494,000,000 57,807,000,000
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 5,659,000,000 5,624,000,000
Loan to Value and Credit Quality [Abstract]        
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan     55.00%  
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan     62.00%  
Average Debt Service Coverage Ratio     2.62  
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 5,659,000,000 5,624,000,000
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio     2.62  
Entity Registrant Name HARTFORD FINANCIAL SERVICES GROUP INC/DE      
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 5,659,000,000 5,624,000,000
agriculture loans [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     16,000,000 26,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     16,000,000 26,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     16,000,000 26,000,000
Industrial Property [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,440,000,000 1,422,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,440,000,000 1,422,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,440,000,000 1,422,000,000
Hotel [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     25,000,000 26,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     25,000,000 26,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     25,000,000 26,000,000
Multifamily [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,378,000,000 1,345,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,378,000,000 1,345,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,378,000,000 1,345,000,000
Office Building [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,504,000,000 1,547,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,504,000,000 1,547,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,504,000,000 1,547,000,000
Retail Site [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,089,000,000 1,109,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,089,000,000 1,109,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,089,000,000 1,109,000,000
Other Property [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     207,000,000 149,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     207,000,000 149,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     207,000,000 149,000,000
East North Central [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     315,000,000 289,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     315,000,000 289,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     315,000,000 289,000,000
East South Central [Member] [Domain]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     14,000,000 14,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     14,000,000 14,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     14,000,000 14,000,000
Middle Atlantic [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     408,000,000 384,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     408,000,000 384,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     408,000,000 384,000,000
Mountain [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     35,000,000 32,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     35,000,000 32,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     35,000,000 32,000,000
New England [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     445,000,000 446,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     445,000,000 446,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     445,000,000 446,000,000
Pacific [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,635,000,000 1,669,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,635,000,000 1,669,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,635,000,000 1,669,000,000
South Atlantic [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,179,000,000 1,174,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,179,000,000 1,174,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,179,000,000 1,174,000,000
West North Central [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     29,000,000 29,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     29,000,000 29,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     29,000,000 29,000,000
West South Central [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     338,000,000 318,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     338,000,000 318,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     338,000,000 318,000,000
Region Others [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages [1]     1,261,000,000 1,269,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages [1]     1,261,000,000 1,269,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages [1]     1,261,000,000 1,269,000,000
Allowance for Loan and Lease Losses [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     31,000,000 82,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     31,000,000 82,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     31,000,000 82,000,000
Assets Held-for-sale [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     0 0
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     0 0
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     0 0
Commercial Loan [Member]        
Mortgage Loans [Line Items]        
Mortgage Loans on Real Estate [2]     5,678,000,000 5,647,000,000
Loans and Leases Receivable, Allowance [Abstract]        
Allowance for Loan and Lease Losses, Real Estate $ 23,000,000 $ 18,000,000 19,000,000 23,000,000
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     5,659,000,000 $ 5,624,000,000
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]        
Valuation allowance, beginning of period 23,000,000 18,000,000    
Allowance for Loan and Lease Losses, Period Increase (Decrease) 0 3,000,000    
Allowance for Loan and Lease Losses, Write-offs 4,000,000 0    
Valuation allowance, end of period $ 19,000,000 $ 21,000,000    
Loan to Value and Credit Quality [Abstract]        
Average Debt Service Coverage Ratio       2.63
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     5,659,000,000 $ 5,624,000,000
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio       2.63
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     5,659,000,000 $ 5,624,000,000
Commercial Loan [Member] | LTV 80 to 100 Percent [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 122,000,000 $ 24,000,000
Loan to Value and Credit Quality [Abstract]        
Average Debt Service Coverage Ratio     1.16 0.81
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 122,000,000 $ 24,000,000
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio     1.16 0.81
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 122,000,000 $ 24,000,000
Commercial Loan [Member] | LTV Between 65 to 80 Percent [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 602,000,000 $ 623,000,000
Loan to Value and Credit Quality [Abstract]        
Average Debt Service Coverage Ratio     2.08 1.82
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 602,000,000 $ 623,000,000
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio     2.08 1.82
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 602,000,000 $ 623,000,000
Commercial Loan [Member] | LTV Less than 65 Percent [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 4,935,000,000 $ 4,977,000,000
Loan to Value and Credit Quality [Abstract]        
Average Debt Service Coverage Ratio     2.74 2.75
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 4,935,000,000 $ 4,977,000,000
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio     2.74 2.75
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 4,935,000,000 $ 4,977,000,000
Commercial Loan [Member] | Mortgages [Member]        
Loan to Value and Credit Quality [Abstract]        
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing     15,000,000 17,000,000
Financing Receivable, Allowance for Credit Losses     $ 16,000,000 $ 20,000,000
Mortgages [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     100.00% 100.00%
Mortgages [Member] | agriculture loans [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     0.30% 0.50%
Mortgages [Member] | Industrial Property [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     25.40% 25.30%
Mortgages [Member] | Hotel [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     0.40% 0.50%
Mortgages [Member] | Multifamily [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     24.40% 23.90%
Mortgages [Member] | Office Building [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     26.60% 27.50%
Mortgages [Member] | Retail Site [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     19.20% 19.70%
Mortgages [Member] | Other Property [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     3.70% 2.60%
Mortgages [Member] | East North Central [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     5.60% 5.10%
Mortgages [Member] | East South Central [Member] [Domain]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     0.20% 0.20%
Mortgages [Member] | Middle Atlantic [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     7.20% 6.80%
Mortgages [Member] | Mountain [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     0.60% 0.60%
Mortgages [Member] | New England [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     7.90% 7.90%
Mortgages [Member] | Pacific [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     28.90% 29.70%
Mortgages [Member] | South Atlantic [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     20.80% 20.90%
Mortgages [Member] | West North Central [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     0.50% 0.50%
Mortgages [Member] | West South Central [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     6.00% 5.70%
Mortgages [Member] | Region Others [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent [1]     22.30% 22.60%
Nonperforming Financial Instruments [Member] | Commercial Loan [Member]        
Loan to Value and Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans     $ 1 $ 2
Commercial Loan [Member]        
Mortgage Loans [Line Items]        
Servicing Asset at Amortized Cost, Fair Value     545,000,000 359,000,000
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding     178,000,000 129,000,000
Investments [Member] | Commercial Loan [Member]        
Mortgage Loans [Line Items]        
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding     367,000,000 230,000,000
Separate Accounts [Member] | Commercial Loan [Member]        
Mortgage Loans [Line Items]        
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding     $ 89,000,000 $ 54,000,000
[1] Primarily represents loans collateralized by multiple properties in various regions.
[2] Amortized cost represents carrying value prior to valuation allowances, if any.