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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 [Line Items]      
Valuation Allowance, Loss Contingency for Loans, LTV Ratio 90.00%    
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 2,918,000,000 $ 3,109,000,000  
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan 54.00%    
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan 63.00%    
Average Debt Service Coverage Ratio 2.45    
Commercial Loan [Member]      
Mortgage Loans on Real Estate [Line Items]      
Mortgage Loans on Real Estate $ 2,937,000,000 3,124,000,000  
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 2,918,000,000 $ 3,109,000,000  
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans $ 0    
Average Debt Service Coverage Ratio 2.45 2.36  
Movement in Valuation Allowance for Mortgage Loans [Roll Forward]      
Allowance, as of Jan. 1 $ 15,000,000 $ 12,000,000 $ 14,000,000
Allowance for Loan and Lease Losses, Write-offs 0 1,000,000 4,000,000
Allowance for Loan and Lease Losses, Period Increase (Decrease) 4,000,000 4,000,000 2,000,000
Allowance, as of Dec. 31 19,000,000 15,000,000 $ 12,000,000
Allowance for Loan and Lease Losses [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 39,000,000 49,000,000  
Mortgages [Member] | Commercial Loan [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans 15,000,000    
Mortgage Loans on Real Estate, Write-down or Reserve, Amount 16,000,000    
East North Central [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 66,000,000 64,000,000  
East South Central [Member] [Domain]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 14,000,000 0  
Middle Atlantic [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 210,000,000 272,000,000  
Mountain [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 4,000,000 35,000,000  
New England [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 163,000,000 146,000,000  
Pacific [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 933,000,000 905,000,000  
South Atlantic [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 579,000,000 532,000,000  
West North Central [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 1,000,000 15,000,000  
West South Central [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 125,000,000 125,000,000  
Region Others [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages [1] 823,000,000 1,015,000,000  
LTV 80 to 100 Percent [Member] | Commercial Loan [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 15,000,000 $ 21,000,000  
Average Debt Service Coverage Ratio 0.91 1.14  
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 $ 280,000,000 $ 452,000,000  
Average Debt Service Coverage Ratio 1.78 1.71  
LTV Less than 65 Percent [Member] | Commercial Loan [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 2,623,000,000 $ 2,636,000,000  
Average Debt Service Coverage Ratio 2.54 2.49  
Mortgages [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 100.00% 100.00%  
Mortgages [Member] | East North Central [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 2.30% 2.10%  
Mortgages [Member] | East South Central [Member] [Domain]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 0.50% 0.00%  
Mortgages [Member] | Middle Atlantic [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 7.20% 8.70%  
Mortgages [Member] | Mountain [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 0.10% 1.10%  
Mortgages [Member] | New England [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 5.60% 4.70%  
Mortgages [Member] | Pacific [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 32.00% 29.10%  
Mortgages [Member] | South Atlantic [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 19.80% 17.10%  
Mortgages [Member] | West North Central [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 0.00% 0.50%  
Mortgages [Member] | West South Central [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 4.30% 4.00%  
Mortgages [Member] | Region Others [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 28.20% 32.70%  
Other Property [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 111,000,000 $ 114,000,000  
Other Property [Member] | Mortgages [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 3.80% 3.70%  
Retail Site [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 650,000,000 $ 713,000,000  
Retail Site [Member] | Mortgages [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 22.30% 22.90%  
Office Building [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 729,000,000 $ 723,000,000  
Office Building [Member] | Mortgages [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 25.00% 23.30%  
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] | Mortgages [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 0.90% 0.80%  
agriculture loans [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 16,000,000 $ 22,000,000  
agriculture loans [Member] | Mortgages [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 0.50% 0.70%  
Industrial Property [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 829,000,000 $ 989,000,000  
Industrial Property [Member] | Mortgages [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 28.40% 31.80%  
Multifamily [Member]      
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 557,000,000 $ 522,000,000  
Multifamily [Member] | Mortgages [Member]      
Mortgage Loans on Real Estate [Abstract]      
Investment Owned, Percent of Net Assets 19.10% 16.80%  
[1] Primarily represents loans collateralized by multiple properties in various regions.