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Derivative Instrument Level 4 Credit Risk Assumed through Credit Derivatives (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Credit Derivatives [Line Items]    
Derivative, Notional Amount $ 56,216 $ 62,185
Derivative, Fair Value, Net (1,001) (926)
Derivative, Fair Value, Amount Offset Against Collateral, Net   13
Credit Default Swap, Selling Protection [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount 2,968 4,487
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 169  
Credit Risk Derivatives, at Fair Value, Net $ 0  
Average Term of Credit Risk Derivatives 4 years  
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  
Average Term of Credit Risk Derivatives 1 year  
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   190
Credit Risk Derivatives, at Fair Value, Net   $ (1)
Average Term of Credit Risk Derivatives   1 year
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   $ (2)
Average Term of Credit Risk Derivatives   2 years
Credit Derivatives in Offsetting Positions [Member] | Credit Default Swap, Selling Protection [Member]    
Credit Derivatives [Line Items]    
Derivative, Notional Amount $ 1,659 $ 2,029
Credit Derivatives in Offsetting Positions [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] | 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] | 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 1,204 176
Credit Risk Derivatives, at Fair Value, Net (10)  
Derivative, Fair Value, Amount Offset Against Collateral, Net   (13)
Credit Derivatives in Offsetting Positions [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 77
Credit Risk Derivatives, at Fair Value, Net (3)  
Derivative, Fair Value, Amount Offset Against Collateral, Net   1
Credit Derivatives in Offsetting Positions [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  
Derivative, Fair Value, Amount Offset Against Collateral, Net   0
Credit Derivatives in Offsetting Positions [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 167  
Credit Risk Derivatives, at Fair Value, Net 1  
Credit Derivatives in Offsetting Positions [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   212
Derivative, Fair Value, Amount Offset Against Collateral, Net   1
Credit Derivatives in Offsetting Positions [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 111 153
Credit Risk Derivatives, at Fair Value, Net 26  
Derivative, Fair Value, Amount Offset Against Collateral, Net   25
Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member]    
Credit Derivatives [Line Items]    
Derivative, Fair Value, Amount Offset Against Collateral, Net   (1)
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 200 350
Credit Risk Derivatives, at Fair Value, Net 201 $ 346
Average Term of Credit Risk Derivatives   1 year
Basket Credit Default Swaps [Member]    
Credit Derivatives [Line Items]    
Amount of Standard Market Indices of Diversified Portfolios of Corporate Issuers 2,500 $ 3,900
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 2,065 3,036
Credit Risk Derivatives, at Fair Value, Net $ 22 $ 22
Average Term of Credit Risk Derivatives 3 years 4 years
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  
Average Term of Credit Risk Derivatives 4 years  
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 $ 297  
Credit Risk Derivatives, at Fair Value, Net $ (5)  
Average Term of Credit Risk Derivatives 4 years  
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   $ 681
Credit Risk Derivatives, at Fair Value, Net   $ (19)
Average Term of Credit Risk Derivatives   6 years
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 $ 110 $ 153
Credit Risk Derivatives, at Fair Value, Net $ (26) $ (25)
Average Term of Credit Risk Derivatives 1 year 1 year
Credit [Member]    
Credit Derivatives [Line Items]    
Credit Risk Derivatives, at Fair Value, Net   $ 321
Derivative, Fair Value, Net $ 195  
Derivative, Fair Value, Amount Offset Against Collateral, Net $ 14  
Credit [Member] | Credit Derivatives in Offsetting Positions [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   $ 1,411
Less than 1 year [Member] | Embedded Derivative Financial Instruments [Member] | Other Credit Derivatives [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