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Derivatives Instruments Level 4 Credit Risk Assumed through Credit Derivatives (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | $ 52,010 | $ 56,216
Credit Default Swap, Selling Protection [Member] |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 2,621 | 2,968
Credit Risk Derivatives, at Fair Value, Net | (6) | 195
Credit Derivatives in Offsetting Positions [Member] | Credit Default Swap, Selling Protection [Member] |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 967 | 1,659
Credit Risk Derivatives, at Fair Value, Net | 11 | 14
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 | 15 | 50
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 | 52 |
Derivative, Fair Value, Amount Offset Against Collateral, 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 | 50 | 77
Derivative, Fair Value, Amount Offset Against Collateral, Net | 0 | 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 | 719 | 1,204
Derivative, Fair Value, Amount Offset Against Collateral, Net | (5) | (10)
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
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | (3)
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
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 | 44 |
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, AA+ Rating [Member] | External Credit Rating, Investment Grade [Member] |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount |  | 167
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 | 87 | 111
Derivative, Fair Value, Amount Offset Against Collateral, Net | 15 | 26
Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member] | Debt Securities Payable [Member] | Standard & Poor's, A- Rating [Member] | External Credit Rating, Investment Grade [Member] |  |
Credit Derivatives [Line Items] |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | 0 | 0
Basket Credit Default Swaps [Member] |  |
Credit Derivatives [Line Items] |  |
Amount of Standard Market Indices of Diversified Portfolios of Corporate Issuers | $ 2,400 | $ 2,500
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 | 4 years |
Derivative, Notional Amount | $ 50 |
Credit Risk Derivatives, at Fair Value, Net | $ 4 |
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 | 4 years | 3 years
Derivative, Notional Amount | $ 2,054 | $ 2,065
Credit Risk Derivatives, at Fair Value, Net | $ 5 | $ 22
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 |  | 4 years
Derivative, Notional Amount |  | $ 50
Credit Risk Derivatives, at Fair Value, Net |  | $ 3
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 |
Derivative, Notional Amount | $ 174 |
Credit Risk Derivatives, at Fair Value, Net | (3) |
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 |  | 4 years
Derivative, Notional Amount |  | $ 297
Credit Risk Derivatives, at Fair Value, Net |  | $ (5)
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
Derivative, Notional Amount | 87 | $ 110
Credit Risk Derivatives, at Fair Value, Net | $ (16) | $ (26)
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 | 5 years | 4 years
Derivative, Notional Amount | $ 204 | $ 169
Credit Risk Derivatives, at Fair Value, Net | $ 4 | $ 0
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 | $ 52 |
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, 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
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
Credit Risk Derivatives, at Fair Value, Net |  | $ 201
Less than 1 year [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] |  |
Average Term of Credit Risk Derivatives | 1 year |
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

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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