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Derivatives Instruments Level 4 Credit Risk Assumed through Credit Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | $ 54,221 | $ 56,216
Credit Default Swap, Selling Protection [Member] |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 3,468 | 2,968
Credit Risk Derivatives, at Fair Value, Net | 191 | 195
Credit Derivatives in Offsetting Positions [Member] | Credit Default Swap, Selling Protection [Member] |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 1,564 | 1,659
Credit Risk Derivatives, at Fair Value, Net | 12 | 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 | 40 | 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 | (1) |
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 | 49 | 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 | 1,204 | 1,204
Derivative, Fair Value, Amount Offset Against Collateral, Net | (7) | (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 | 0
Derivative, Fair Value, Amount Offset Against Collateral, Net | 0 | 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 | 116 | 167
Derivative, Fair Value, Amount Offset Against Collateral, Net | 1 | 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 | 103 | 111
Derivative, Fair Value, Amount Offset Against Collateral, Net | 19 | 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
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 | 4 years
Derivative, Notional Amount | $ 229 | $ 169
Credit Risk Derivatives, at Fair Value, Net | $ 2 | $ 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
ERROR in label resolution. |  |
Credit Derivatives [Line Items] |  |
Amount of Standard Market Indices of Diversified Portfolios of Corporate Issuers | $ 3,000 | $ 2,500
ERROR in label resolution. | 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 |
ERROR in label resolution. | 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 | 3 years
Derivative, Notional Amount | $ 2,589 | $ 2,065
Credit Risk Derivatives, at Fair Value, Net | $ 8 | $ 22
ERROR in label resolution. | 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
ERROR in label resolution. | 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 | 4 years
Derivative, Notional Amount | $ 246 | $ 297
Credit Risk Derivatives, at Fair Value, Net | (4) | $ (5)
ERROR in label resolution. | 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 | 102 | $ 110
Credit Risk Derivatives, at Fair Value, Net | (19) | (26)
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 | 200
Credit Risk Derivatives, at Fair Value, Net | $ 200 | $ 201
Less than 1 year [Member] | ERROR in label resolution. | 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 | 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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- 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=64837297&loc=SL5708775-113959 + Details
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