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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 |

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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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