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Derivative Instruments - Derivatives - Credit Risk Assumed through Credit Derivatives (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Credit Derivatives [Line Items] |  |
Notional Amount | $ 11,764 | $ 12,730
Fair Value | (47) | (90)
Credit Default Swap, Selling Protection [Member] |  |
Credit Derivatives [Line Items] |  |
Notional Amount | 946 | 1,346
Credit Risk Derivatives, at Fair Value, Net | 8 | 0
Credit derivatives |  |
Credit Derivatives [Line Items] |  |
Offsetting Notional Amount | 23 | 523
Credit derivatives | Single name credit default swaps | A Minus | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Notional Amount | 170 | 130
Fair Value | $ 4 | $ 3
Weighted Average Years to Maturity | 5 years | 5 years
Offsetting Notional Amount | $ 0 | $ 0
Offsetting Fair Value | 0 | 0
Credit derivatives | Single name credit default swaps | B | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Notional Amount |  | 9
Fair Value |  | 0
Offsetting Notional Amount |  | 9
Offsetting Fair Value |  | 0
Credit derivatives | Basket credit default swaps | A Minus | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Notional Amount | 12 |
Fair Value | $ 0 |
Weighted Average Years to Maturity | 5 years |
Offsetting Notional Amount | $ 2 |
Offsetting Fair Value | 0 |
Credit derivatives | Basket credit default swaps | BBB Plus | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Notional Amount | 743 | 1,137
Fair Value | $ 10 | $ 2
Weighted Average Years to Maturity | 6 years | 3 years
Offsetting Notional Amount | $ 0 | $ 454
Offsetting Fair Value | 0 | (2)
Credit derivatives | Basket credit default swaps | B Plus | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Notional Amount |  | 27
Fair Value |  | $ 2
Weighted Average Years to Maturity |  | 3 years
Offsetting Notional Amount |  | $ 27
Offsetting Fair Value |  | 0
Credit derivatives | Basket credit default swaps | A | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Notional Amount |  | 13
Fair Value |  | $ (1)
Weighted Average Years to Maturity |  | 5 years
Offsetting Notional Amount |  | $ 3
Offsetting Fair Value |  | 0
Credit derivatives | Basket credit default swaps | CCC | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Notional Amount | 21 | 30
Fair Value | (6) | (6)
Offsetting Notional Amount | 21 | 30
Offsetting Fair Value | 6 | 7
Credit derivatives in offsetting positions | Credit Default Swap, Selling Protection [Member] |  |
Credit Derivatives [Line Items] |  |
Credit Risk Derivatives, at Fair Value, Net | $ 6 | $ 5

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- Definition Derivative, Nominal Value, Amount Offset Against Collateral, Net + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5708775-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of credit risk derivative asset after deduction of credit risk derivative liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5708775-113959 + Details
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- Definition The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were offset against collateral under a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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