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Investments and Derivative Instruments Level 4 Mortgage Loans (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 5,624,000,000 $ 5,556,000,000 [1]  
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan 54.00%    
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan 62.00%    
Average Debt Service Coverage Ratio 2.63    
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]      
Servicing Asset at Fair Value, Amount $ 0    
Commercial Loan [Member]      
Mortgage Loans on Real Estate [Line Items]      
Mortgage Loans on Real Estate [2] 5,647,000,000 5,574,000,000  
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 5,624,000,000 5,556,000,000  
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Allowance, as of Jan. 1 18,000,000 67,000,000 $ 68,000,000
Allowance for Loan and Lease Losses, Period Increase (Decrease) 7,000,000 4,000,000 2,000,000
Allowance for Loan and Lease Losses, Write-offs 2,000,000 53,000,000 3,000,000
Allowance, as of Dec. 31 $ 23,000,000 $ 18,000,000 $ 67,000,000
Average Debt Service Coverage Ratio 2.63 2.51  
Mortgage Loans on Commercial, Number of Delinquent Loans   $ 1  
Allowance for Loan and Lease Losses [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 82,000,000 140,000,000  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 0 0  
Mortgage Loans on Real Estate [Member] | Commercial Loan [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Mortgage Loans on Commercial, Number of Delinquent Loans 17 7,000,000  
Mortgage Loans on Real Estate, Write-down or Reserve, Amount 20,000,000 0  
East North Central [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 289,000,000 211,000,000 [1]  
East South Central [Member] [Domain]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 14,000,000 0 [1]  
Middle Atlantic [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 384,000,000 468,000,000 [1]  
Mountain [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 32,000,000 88,000,000 [1]  
New England [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 446,000,000 381,000,000 [1]  
Pacific [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 1,669,000,000 1,607,000,000 [1]  
South Atlantic [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 1,174,000,000 1,019,000,000 [1]  
West North Central [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 29,000,000 44,000,000 [1]  
West South Central [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 318,000,000 302,000,000 [1]  
Region Others [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages [1] $ 1,269,000,000 $ 1,436,000,000  
Mortgage Loans on Real Estate [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 100.00% 100.00%  
Mortgage Loans on Real Estate [Member] | East North Central [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 5.10% 3.80%  
Mortgage Loans on Real Estate [Member] | East South Central [Member] [Domain]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 0.20% 0.00%  
Mortgage Loans on Real Estate [Member] | Middle Atlantic [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 6.80% 8.40%  
Mortgage Loans on Real Estate [Member] | Mountain [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 0.60% 1.60%  
Mortgage Loans on Real Estate [Member] | New England [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 7.90% 6.90%  
Mortgage Loans on Real Estate [Member] | Pacific [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 29.70% 29.00%  
Mortgage Loans on Real Estate [Member] | South Atlantic [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 20.90% 18.30%  
Mortgage Loans on Real Estate [Member] | West North Central [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 0.50% 0.80%  
Mortgage Loans on Real Estate [Member] | West South Central [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 5.70% 5.40%  
Mortgage Loans on Real Estate [Member] | Region Others [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 22.60% 25.80%  
Office Building [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 1,547,000,000 $ 1,517,000,000  
Office Building [Member] | Mortgage Loans on Real Estate [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 27.50% 27.30%  
Hotel [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 26,000,000 $ 26,000,000  
Hotel [Member] | Mortgage Loans on Real Estate [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 0.50% 0.50%  
Industrial Property [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 1,422,000,000 $ 1,476,000,000  
Industrial Property [Member] | Mortgage Loans on Real Estate [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 25.30% 26.60%  
agriculture loans [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 26,000,000 $ 46,000,000  
agriculture loans [Member] | Mortgage Loans on Real Estate [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 0.50% 0.80%  
Multifamily [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 1,345,000,000 $ 1,190,000,000  
Multifamily [Member] | Mortgage Loans on Real Estate [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 23.90% 21.40%  
Retail Site [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 1,109,000,000 $ 1,147,000,000  
Retail Site [Member] | Mortgage Loans on Real Estate [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 19.70% 20.60%  
Other Property [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 149,000,000 $ 154,000,000  
Other Property [Member] | Mortgage Loans on Real Estate [Member]      
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Investment Owned, Percent of Net Assets 2.60% 2.80%  
Commercial Loan [Member]      
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]      
Servicing Asset at Amortized Cost, Fair Value $ 359,000,000    
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding 129,000,000    
Commercial Loan [Member] | Investments [Member]      
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]      
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding 230,000,000    
Commercial Loan [Member] | Separate Accounts [Member]      
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]      
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding 54,000,000    
LTV 80 to 100 Percent [Member] | Commercial Loan [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 24,000,000 $ 53,000,000  
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Average Debt Service Coverage Ratio 0.81 1.07  
LTV Between 65 to 80 Percent [Member] | Commercial Loan [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 623,000,000 $ 789,000,000  
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Average Debt Service Coverage Ratio 1.82 1.75  
LTV Less than 65 Percent [Member] | Commercial Loan [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 4,977,000,000 $ 4,714,000,000  
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Average Debt Service Coverage Ratio 2.75 2.66  
[1] Primarily represents loans collateralized by multiple properties in various regions.
[2] Amortized cost represents carrying value prior to valuation allowances, if any.