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Derivatives Instruments Level 4 Credit Risk Assumed through Credit Derivatives (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Credit Derivatives [Line Items]    
Derivative, Notional Amount $ 59,177 $ 62,185
Credit Default Swap, Selling Protection [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 3,726 4,487
Credit Risk Derivatives, at Fair Value, Net $ 338 $ 321
Single Name Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, A- Rating [Member] | External Credit Rating, Investment Grade [Member]    
Credit Derivatives [Line Items]    
Average Term of Credit Risk Derivatives 4 years  
Derivative, Notional Amount $ 169  
Credit Risk Derivatives, at Fair Value, Net $ 1  
Single Name Credit Default Swaps [Member] | 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 [Line Items]    
Average Term of Credit Risk Derivatives 1 year  
Derivative, Notional Amount $ 77  
Credit Risk Derivatives, at Fair Value, Net 0  
Single Name Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member]    
Credit Derivatives [Line Items]    
Average Term of Credit Risk Derivatives   1 year
Derivative, Notional Amount   $ 190
Credit Risk Derivatives, at Fair Value, Net   $ (1)
Single Name Credit Default Swaps [Member] | 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 [Line Items]    
Average Term of Credit Risk Derivatives   2 years
Derivative, Notional Amount   $ 77
Credit Risk Derivatives, at Fair Value, Net   (2)
Basket Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Amount of Standard Market Indices of Diversified Portfolios of Corporate Issuers $ 3,100 $ 3,900
Basket Credit Default Swaps [Member] | 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 [Line Items]    
Average Term of Credit Risk Derivatives 5 years  
Derivative, Notional Amount $ 50  
Credit Risk Derivatives, at Fair Value, Net $ 3  
Basket Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member]    
Credit Derivatives [Line Items]    
Average Term of Credit Risk Derivatives 3 years 4 years
Derivative, Notional Amount $ 2,446 $ 3,036
Credit Risk Derivatives, at Fair Value, Net $ 23 $ 22
Basket Credit Default Swaps [Member] | 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 [Line Items]    
Average Term of Credit Risk Derivatives 5 years 6 years
Derivative, Notional Amount $ 516 $ 681
Credit Risk Derivatives, at Fair Value, Net $ (12) $ (19)
Basket Credit Default Swaps [Member] | 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 [Line Items]    
Average Term of Credit Risk Derivatives 1 year 1 year
Derivative, Notional Amount $ 118 $ 153
Credit Risk Derivatives, at Fair Value, Net $ (28) $ (25)
Embedded Derivative Financial Instruments [Member] | Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, A+ Rating [Member] | External Credit Rating, Investment Grade [Member]    
Credit Derivatives [Line Items]    
Average Term of Credit Risk Derivatives 1 year 1 year
Derivative, Notional Amount $ 350 $ 350
Credit Risk Derivatives, at Fair Value, Net 351 346
Credit Derivatives in Offsetting Positions [Member] | Credit Default Swap, Selling Protection [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 1,898 2,029
Credit Risk Derivatives, at Fair Value, Net 16 13
Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, A- Rating [Member] | External Credit Rating, Investment Grade [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 50  
Credit Risk Derivatives, at Fair Value, Net 0  
Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member] | 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 [Line Items]    
Derivative, Notional Amount 77  
Credit Risk Derivatives, at Fair Value, Net 0  
Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount   176
Credit Risk Derivatives, at Fair Value, Net   (1)
Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member] | 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 [Line Items]    
Derivative, Notional Amount   77
Credit Risk Derivatives, at Fair Value, Net   1
Credit Derivatives in Offsetting Positions [Member] | Basket Credit Default Swaps [Member] | 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 [Line Items]    
Derivative, Notional Amount 50  
Credit Risk Derivatives, at Fair Value, Net (3)  
Credit Derivatives in Offsetting Positions [Member] | Basket Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 1,415 1,411
Credit Risk Derivatives, at Fair Value, Net (10) (13)
Credit Derivatives in Offsetting Positions [Member] | Basket Credit Default Swaps [Member] | 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 [Line Items]    
Derivative, Notional Amount 188 212
Credit Risk Derivatives, at Fair Value, Net 1 1
Credit Derivatives in Offsetting Positions [Member] | Basket Credit Default Swaps [Member] | 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 [Line Items]    
Derivative, Notional Amount 118 153
Credit Risk Derivatives, at Fair Value, Net 28 25
Credit Derivatives in Offsetting Positions [Member] | Embedded Derivative Financial Instruments [Member] | Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, A+ Rating [Member] | External Credit Rating, Investment Grade [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 0 0
Credit Risk Derivatives, at Fair Value, Net $ 0 $ 0