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Investments and Derivative Instruments Level 4 Mortgage Loans (Details)
9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Mortgage Loans [Line Items]        
Servicing Asset     $ 0  
Loans and Leases Receivable, Allowance [Abstract]        
Available-for-sale Securities, Amortized Cost Basis     57,101,000,000 $ 56,038,000,000
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 5,552,000,000 5,556,000,000
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     2.67  
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 5,552,000,000 5,556,000,000
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio     2.67  
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     $ 5,552,000,000 5,556,000,000
agriculture loans [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     33,000,000 46,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     33,000,000 46,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     33,000,000 46,000,000
Industrial Property [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,437,000,000 1,476,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,437,000,000 1,476,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,437,000,000 1,476,000,000
Hotel [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     26,000,000 26,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     26,000,000 26,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     26,000,000 26,000,000
Multifamily [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,339,000,000 1,190,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,339,000,000 1,190,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,339,000,000 1,190,000,000
Office Building [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,504,000,000 1,517,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,504,000,000 1,517,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,504,000,000 1,517,000,000
Retail Site [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,063,000,000 1,147,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,063,000,000 1,147,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,063,000,000 1,147,000,000
Other Property [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     150,000,000 154,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     150,000,000 154,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     150,000,000 154,000,000
East North Central [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     259,000,000 211,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     259,000,000 211,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     259,000,000 211,000,000
East South Central [Member] [Domain]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     14,000,000 0
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     14,000,000 0
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     14,000,000 0
Middle Atlantic [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     419,000,000 468,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     419,000,000 468,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     419,000,000 468,000,000
Mountain [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     47,000,000 88,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     47,000,000 88,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     47,000,000 88,000,000
New England [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     406,000,000 381,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     406,000,000 381,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     406,000,000 381,000,000
Pacific [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,619,000,000 1,607,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,619,000,000 1,607,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,619,000,000 1,607,000,000
South Atlantic [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,173,000,000 1,019,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,173,000,000 1,019,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     1,173,000,000 1,019,000,000
West North Central [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     30,000,000 44,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     30,000,000 44,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     30,000,000 44,000,000
West South Central [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     311,000,000 302,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     311,000,000 302,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     311,000,000 302,000,000
Region Others [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages [1]     1,274,000,000 1,436,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages [1]     1,274,000,000 1,436,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages [1]     1,274,000,000 1,436,000,000
Allowance for Loan and Lease Losses [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     80,000,000 140,000,000
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     80,000,000 140,000,000
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     80,000,000 140,000,000
Assets Held-for-sale [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages       0
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages       0
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages       0
Commercial Loan [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Available-for-sale Securities, Amortized Cost Basis [2]     5,572,000,000 5,574,000,000
Allowance for Loan and Lease Losses, Real Estate $ 18,000,000 $ 67,000,000 20,000,000 18,000,000
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 5,552,000,000 $ 5,556,000,000
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]        
Valuation allowance, beginning of period 18,000,000 67,000,000    
Allowance for Loan and Lease Losses, Period Increase (Decrease) 4,000,000 3,000,000    
Allowance for Loan and Lease Losses, Write-offs 2,000,000 51,000,000    
Valuation allowance, end of period $ 20,000,000 $ 19,000,000    
Loan to Value and Credit Quality [Abstract]        
Average Debt Service Coverage Ratio     2.67 2.51
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 5,552,000,000 $ 5,556,000,000
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio     2.67 2.51
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 5,552,000,000 $ 5,556,000,000
Commercial Loan [Member] | LTV 80 to 100 Percent [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 23,000,000 $ 53,000,000
Loan to Value and Credit Quality [Abstract]        
Average Debt Service Coverage Ratio     1.16 1.07
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 23,000,000 $ 53,000,000
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio     1.16 1.07
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 23,000,000 $ 53,000,000
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     $ 722,000,000 $ 789,000,000
Loan to Value and Credit Quality [Abstract]        
Average Debt Service Coverage Ratio     1.80 1.75
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 722,000,000 $ 789,000,000
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio     1.80 1.75
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 722,000,000 $ 789,000,000
Commercial Loan [Member] | LTV Less than 65 Percent [Member]        
Loans and Leases Receivable, Allowance [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 4,807,000,000 $ 4,714,000,000
Loan to Value and Credit Quality [Abstract]        
Average Debt Service Coverage Ratio     2.82 2.66
Commercial Mortgage Loans Credit Quality [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 4,807,000,000 $ 4,714,000,000
Available-for-sale Securities Mortgage Loans Average Debt Service Coverage Ratio     2.82 2.66
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages     $ 4,807,000,000 $ 4,714,000,000
Commercial Loan [Member] | Mortgages [Member]        
Loan to Value and Credit Quality [Abstract]        
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing     6,000,000  
Financing Receivable, Allowance for Credit Losses     $ 2,000,000  
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     0.60% 0.80%
Mortgages [Member] | Industrial Property [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     25.90% 26.60%
Mortgages [Member] | Hotel [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] | Multifamily [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     24.10% 21.40%
Mortgages [Member] | Office Building [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     27.10% 27.30%
Mortgages [Member] | Retail Site [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     19.10% 20.60%
Mortgages [Member] | Other Property [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     2.70% 2.80%
Mortgages [Member] | East North Central [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     4.70% 3.80%
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     0.30% 0.00%
Mortgages [Member] | Middle Atlantic [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     7.50% 8.40%
Mortgages [Member] | Mountain [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     0.80% 1.60%
Mortgages [Member] | New England [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     7.30% 6.90%
Mortgages [Member] | Pacific [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     29.30% 29.00%
Mortgages [Member] | South Atlantic [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     21.10% 18.30%
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% 0.80%
Mortgages [Member] | West South Central [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent     5.60% 5.40%
Mortgages [Member] | Region Others [Member]        
Mortgage Loans on Real Estate by Region and Property Type [Abstract]        
Available-for-sale Securities Mortgage Loans Percent [1]     22.90% 25.80%
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 $ 1
Commercial Loan [Member]        
Mortgage Loans [Line Items]        
Servicing Asset at Amortized Cost, Fair Value     148,000,000  
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding     59,000,000  
Investments [Member] | Commercial Loan [Member]        
Mortgage Loans [Line Items]        
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding     89,000,000  
Separate Accounts [Member] | Commercial Loan [Member]        
Mortgage Loans [Line Items]        
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding     $ 20,000,000  
[1] Primarily represents loans collateralized by multiple properties in various regions.
[2] Amortized cost represents carrying value prior to valuation allowances, if any.