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Investments and Derivative Instruments Level 4 Mortgage Loans (Details)
6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Mortgage Loans on Real Estate [Line Items]        
Average Debt Service Coverage Ratio 2.43      
Available-for-sale Securities, Amortized Cost Basis $ 23,515,000,000   $ 23,737,000,000  
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 2,871,000,000   2,918,000,000  
Valuation Allowance [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 63.00%      
Commercial Loan [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate [1] $ 2,890,000,000   $ 2,937,000,000  
Average Debt Service Coverage Ratio 2.43   2.45  
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 2,871,000,000   $ 2,918,000,000  
Valuation Allowance [Abstract]        
Allowance for Loan and Lease Losses, Period Increase (Decrease) 0 $ 4,000,000    
Allowance for Loan and Lease Losses, Write-offs 0 0    
Allowance for Loan and Lease Losses, Real Estate (19,000,000) $ (19,000,000) (19,000,000) $ (15,000,000)
Allowance for Loan and Lease Losses [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 31,000,000   39,000,000  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 0   0  
East North Central [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 66,000,000   66,000,000  
East South Central [Member] [Domain]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 14,000,000   14,000,000  
Middle Atlantic [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 209,000,000   210,000,000  
Mountain [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 4,000,000   4,000,000  
New England [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 163,000,000   163,000,000  
Pacific [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 898,000,000   933,000,000  
South Atlantic [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 571,000,000   579,000,000  
West North Central [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 1,000,000   1,000,000  
West South Central [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 128,000,000   125,000,000  
Region Others [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages [2] 817,000,000   823,000,000  
Office Building [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 706,000,000   729,000,000  
Hotel [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 25,000,000   26,000,000  
agriculture loans [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 16,000,000   16,000,000  
Industrial Property [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 827,000,000   829,000,000  
Multifamily [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 559,000,000   557,000,000  
Retail Site [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages 629,000,000   650,000,000  
Other Property [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 109,000,000   $ 111,000,000  
Mortgages [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 0.00%   0.00%  
Mortgages [Member] | East North Central [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 2.30%   2.30%  
Mortgages [Member] | East South Central [Member] [Domain]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 0.50%   0.50%  
Mortgages [Member] | Middle Atlantic [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 7.30%   7.20%  
Mortgages [Member] | Mountain [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 0.10%   0.10%  
Mortgages [Member] | New England [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 5.70%   5.60%  
Mortgages [Member] | Pacific [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 31.30%   32.00%  
Mortgages [Member] | South Atlantic [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 19.90%   19.80%  
Mortgages [Member] | West North Central [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 0.00%   0.00%  
Mortgages [Member] | West South Central [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 4.50%   4.30%  
Mortgages [Member] | Region Others [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets [2] 28.40%   28.20%  
Mortgages [Member] | Office Building [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 24.60%   25.00%  
Mortgages [Member] | Hotel [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 0.90%   0.90%  
Mortgages [Member] | agriculture loans [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 0.50%   0.50%  
Mortgages [Member] | Industrial Property [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 28.80%   28.40%  
Mortgages [Member] | Multifamily [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 19.50%   19.10%  
Mortgages [Member] | Retail Site [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 21.90%   22.30%  
Mortgages [Member] | Other Property [Member]        
Mortgage Loans on Real Estate [Line Items]        
Investment Owned, Percent of Net Assets 3.80%   3.80%  
LTV Less than 65 Percent [Member] | Commercial Loan [Member]        
Mortgage Loans on Real Estate [Line Items]        
Average Debt Service Coverage Ratio 2.53   2.54  
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 2,539,000,000   $ 2,623,000,000  
LTV 80 to 100 Percent [Member] | Commercial Loan [Member]        
Mortgage Loans on Real Estate [Line Items]        
Average Debt Service Coverage Ratio 0.96   0.91  
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 96,000,000   $ 15,000,000  
LTV Between 65 to 80 Percent [Member] | Commercial Loan [Member]        
Mortgage Loans on Real Estate [Line Items]        
Average Debt Service Coverage Ratio 2.09   1.78  
Mortgage Loans on Real Estate, Carrying Amount of Mortgages $ 236,000,000   $ 280,000,000  
Mortgages [Member] | Commercial Loan [Member]        
Valuation Allowance [Abstract]        
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 15,000,000   15,000,000  
Financing Receivable, Allowance for Credit Losses 16,000,000   16,000,000  
Nonperforming Financial Instruments [Member] | Commercial Loan [Member]        
Mortgage Loans on Real Estate [Line Items]        
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans $ 1   $ 1  
[1] Amortized cost represents carrying value prior to valuation allowances, if any.
[2] Primarily represents loans collateralized by multiple properties in various regions.