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Investments and Derivative Instruments Level 4 Credit Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Credit Derivatives [Line Items]    
Derivative, Notional Amount $ 61,322 $ 62,185
Basket Credit Default Swaps [Member]    
Credit Derivatives Footnote [Abstract]    
Amount of Standard Market Indices of Diversified Portfolios of Corporate Issuers 2,800 3,900
Credit Default Swap, Selling Protection [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1],[2] 3,414 4,487
Credit Risk Derivatives, at Fair Value, Net 320 321
Credit Default Swap, Selling Protection [Member] | Credit Derivatives in Offsetting Positions [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1],[2] 2,017 2,029
Credit Risk Derivatives, at Fair Value, Net 19 13
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BB Rating [Member] | External Credit Rating, Non Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Credit Risk Derivatives, at Fair Value, Net 0 1
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BB- Rating [Member] | External Credit Rating, Non Investment Grade [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1] 153  
Credit Risk Derivatives, at Fair Value, Net $ (1)  
Derivative, Average Remaining Maturity 1 year  
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BB- Rating [Member] | External Credit Rating, Non Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1] $ 153  
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1]   190
Credit Risk Derivatives, at Fair Value, Net   $ (1)
Derivative, Average Remaining Maturity   1 year
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Basket Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1] 2,046 $ 3,036
Credit Risk Derivatives, at Fair Value, Net $ 18 $ 22
Derivative, Average Remaining Maturity 3 years 4 years
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1]   $ 176
Credit Risk Derivatives, at Fair Value, Net $ 0 (1)
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Basket Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1] 1,417 1,411
Credit Risk Derivatives, at Fair Value, Net (12) (13)
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, A- Rating [Member] | External Credit Rating, Investment Grade [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1] 102  
Credit Risk Derivatives, at Fair Value, Net $ 0  
Derivative, Average Remaining Maturity 2 years  
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, A- Rating [Member] | External Credit Rating, Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1] $ 88  
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, B Rating [Member] | External Credit Rating, Non Investment Grade [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1]   77
Credit Risk Derivatives, at Fair Value, Net   $ (2)
Derivative, Average Remaining Maturity   2 years
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, B Rating [Member] | External Credit Rating, Non Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1]   $ 77
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, A+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Embedded Derivative Financial Instruments [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1] 350 350
Credit Risk Derivatives, at Fair Value, Net $ 351 $ 346
Derivative, Average Remaining Maturity 1 year 1 year
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, A+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Embedded Derivative Financial Instruments [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1] $ 0 $ 0
Credit Risk Derivatives, at Fair Value, Net 0 0
Credit Default Swap, Selling Protection [Member] | Collateralized Mortgage Backed Securities [Member] | Standard & Poor's, AA+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Basket Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1] 610 681
Credit Risk Derivatives, at Fair Value, Net $ (18) $ (19)
Derivative, Average Remaining Maturity 5 years 6 years
Credit Default Swap, Selling Protection [Member] | Collateralized Mortgage Backed Securities [Member] | Standard & Poor's, AA+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Basket Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1] $ 206 $ 212
Credit Risk Derivatives, at Fair Value, Net 2 1
Credit Default Swap, Selling Protection [Member] | Collateralized Mortgage Backed Securities [Member] | Standard & Poor's, CCC+ Rating [Member] | External Credit Rating, Non Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Basket Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Credit Risk Derivatives, at Fair Value, Net 29 25
Credit Default Swap, Selling Protection [Member] | Collateralized Mortgage Backed Securities [Member] | Standard & Poor's, CCC Rating [Member] | External Credit Rating, Non Investment Grade [Member] | Basket Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1] 153 153
Credit Risk Derivatives, at Fair Value, Net $ (30) $ (25)
Derivative, Average Remaining Maturity 1 year 1 year
Credit Default Swap, Selling Protection [Member] | Collateralized Mortgage Backed Securities [Member] | Standard & Poor's, CCC Rating [Member] | External Credit Rating, Non Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Basket Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount [1] $ 153 $ 153
[1] Notional amount is equal to the maximum potential future loss amount. These derivatives are governed by agreements, clearing house rules, and applicable law, which include collateral posting requirements. There is no additional specific collateral related to these contracts or recourse provisions included in the contracts to offset losses.
[2] [1]The average credit ratings are based on availability and the midpoint of the applicable ratings among Moody’s, S&P, Fitch, and Morningstar. If no rating is available from a rating agency, then an internally developed rating is used.