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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

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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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- Definition Average period covered by credit risk derivative contracts, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5708775-113959 + Details
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