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Investments and Derivative Instruments Level 4 Credit Derivatives (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount |  | $ 66,321 | $ 72,850
Basket Credit Default Swaps [Member] |  |  |
Credit Derivatives Footnote [Abstract] |  |  |
Amount of Standard Market Indices of Diversified Portfolios of Corporate Issuers |  | 4,500 | 3,500
Credit Default Swap, Selling Protection [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1],[2] | 5,146 | 4,159
Credit Risk Derivatives, at Fair Value, Net |  | 352 | 345
Credit Default Swap, Selling Protection [Member] | Credit Derivatives in Offsetting Positions [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1],[2] | 2,079 | 2,672
Credit Risk Derivatives, at Fair Value, Net |  | (1) | (5)
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BB Rating [Member] | External Credit Rating, Non Investment Grade [Member] | Single Name Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1] | 29 | 29
Credit Risk Derivatives, at Fair Value, Net |  | $ 0 | $ 0
Derivative, Average Remaining Maturity |  | 2 years | 2 years
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BB Rating [Member] | External Credit Rating, Non Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1] | $ 29 | $ 29
Credit Risk Derivatives, at Fair Value, Net |  | (1) | (1)
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Single Name Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1] | 242 | 320
Credit Risk Derivatives, at Fair Value, Net |  | $ 3 | $ 5
Derivative, Average Remaining Maturity |  | 2 years | 2 years
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Basket Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1] | $ 3,232 | $ 2,546
Credit Risk Derivatives, at Fair Value, Net |  | $ 45 | $ 33
Derivative, Average Remaining Maturity |  | 4 years | 3 years
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Single Name Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1] | $ 217 | $ 247
Credit Risk Derivatives, at Fair Value, Net |  | (4) | (5)
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, BBB+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Basket Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1] | 1,414 | 1,973
Credit Risk Derivatives, at Fair Value, Net |  | (20) | (25)
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, B Rating [Member] | External Credit Rating, Non Investment Grade [Member] | Basket Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1],[2],[3] | 58 | 38
Credit Risk Derivatives, at Fair Value, Net | [2],[3] | $ 4 | $ (1)
Derivative, Average Remaining Maturity | [2],[3] | 5 years | 12 years
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 in Offsetting Positions [Member] | Basket Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1],[2],[3] | $ 0 | $ 0
Credit Risk Derivatives, at Fair Value, Net | [2],[3] | 0 | 0
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, A+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Embedded Derivative Financial Instruments [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1] | 350 | 350
Credit Risk Derivatives, at Fair Value, Net |  | $ 346 | $ 342
Derivative, Average Remaining Maturity |  | 2 years | 2 years
Credit Default Swap, Selling Protection [Member] | Debt Securities Payable [Member] | Standard & Poor's, A+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Credit Derivatives in Offsetting Positions [Member] | Embedded Derivative Financial Instruments [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1] | $ 0 | $ 0
Credit Risk Derivatives, at Fair Value, Net |  | 0 | 0
Credit Default Swap, Selling Protection [Member] | Collateralized Mortgage Backed Securities [Member] | Standard & Poor's, AA+ Rating [Member] | External Credit Rating, Investment Grade [Member] | Basket Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1] | 1,081 | 722
Credit Risk Derivatives, at Fair Value, Net |  | $ (24) | $ (12)
Derivative, Average Remaining Maturity |  | 7 years | 6 years
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 in Offsetting Positions [Member] | Basket Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1] | $ 265 | $ 269
Credit Risk Derivatives, at Fair Value, Net |  | 2 | 3
Credit Default Swap, Selling Protection [Member] | Collateralized Mortgage Backed Securities [Member] | Standard & Poor's, CCC+ Rating [Member] | External Credit Rating, Non Investment Grade [Member] | Basket Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1] | 154 | 154
Credit Risk Derivatives, at Fair Value, Net |  | $ (22) | $ (22)
Derivative, Average Remaining Maturity |  | 2 years | 2 years
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 in Offsetting Positions [Member] | Basket Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative, Notional Amount | [1] | $ 154 | $ 154
Credit Risk Derivatives, at Fair Value, Net |  | $ 22 | $ 23
[1] | Notional amount is equal to the maximum potential future loss amount. These derivatives are governed by agreements, clearing house rules and applicable law which include collateral posting requirements. There is no additional specific collateral related to these contracts or recourse provisions included in the contracts to offset losses.
[2] | The average credit ratings are based on availability and the midpoint of the applicable ratings among Moody’s, S&P, Fitch, and Morningstar. If no rating is available from a rating agency, then an internally developed rating is used.
[3] | Includes $4.5 billion and $3.5 billion as of June 30, 2015 and December 31, 2014, respectively, of standard market indices of diversified portfolios of corporate and CMBS issuers referenced through credit default swaps. These swaps are subsequently valued based upon the observable standard market index.

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- Definition Amount of standard market indices of diversified portfolios of corporate issuers. + References No definition available. + Details
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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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- 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=56946850&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=49121117&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=49121117&loc=d3e13433-108611 + Details
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