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Derivatives Instruments Level 4 Credit Risk Assumed through Credit Derivatives (Details) - USD ($) $ in Millions | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount |  | $ 52,286 | $ 56,216
Credit Default Swap, Selling Protection [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount |  | 2,026 | 2,968
Credit Risk Derivatives, at Fair Value, Net |  | (2) | 195
Credit Derivatives in Offsetting Positions [Member] | Credit Default Swap, Selling Protection [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount |  | 921 | 1,659
Credit Risk Derivatives, at Fair Value, Net |  | 10 | 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 |  | 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 |  | (3) | (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 |  | 52 | 50
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | 0 | (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 |  |  | 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 |  |  | 111
Derivative, Fair Value, Amount Offset Against Collateral, Net |  |  | 26
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 |  | 68 |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | 12 |
Credit Derivatives in Offsetting Positions [Member] | Credit Default Swap, Selling Protection [Member] | Collateralized Mortgage Backed Securities [Member] | Standard & Poor's, A+ Rating [Member] | External Credit Rating, Investment Grade [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount |  | 17 |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | 1 |
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 |  | $ 1,700 | $ 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 |  | 3 years | 3 years
Derivative, Notional Amount |  | $ 1,579 | $ 2,065
Credit Risk Derivatives, at Fair Value, Net |  | 4 | $ 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 |  |  | 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 |  |  | $ 110
Credit Risk Derivatives, at Fair Value, Net |  |  | $ (26)
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 |  | 68 |
Credit Risk Derivatives, at Fair Value, Net |  | $ (13) |
Basket Credit Default Swaps [Member] | Credit Default Swap, Selling Protection [Member] | Collateralized Mortgage Backed Securities [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 |  | $ 37 |
Credit Risk Derivatives, at Fair Value, Net |  | $ (2) |
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 |  | $ 240 | $ 169
Credit Risk Derivatives, at Fair Value, Net |  | 5 | $ 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
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 |  | 52 |
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] | 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 |  |
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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- 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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- Definition Fair value of credit risk derivative asset after deduction of credit risk derivative liability. + 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 (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5708775-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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