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Derivative Instruments - Derivatives - Credit Risk Assumed through Credit Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Credit Derivatives [Line Items] |  |  |
Notional Amount | $ 12,511 |  | $ 12,291
Fair Value | (40) |  | (61)
Credit Default Swap, Selling Protection [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Notional Amount | 829 |  | 1,123
Credit derivatives |  |  |
Credit Derivatives [Line Items] |  |  |
Fair Value | 13 |  | (3)
Offsetting Notional Amount | 19 |  | 21
Offsetting Fair Value | 6 |  | 6
Credit derivatives | Single name credit default swaps | A Minus | Investment grade risk exposure |  |  |
Credit Derivatives [Line Items] |  |  |
Notional Amount | 165 |  |
Fair Value | $ 3 |  |
Weighted Average Years to Maturity | 5 years |  |
Offsetting Notional Amount | $ 0 |  |
Offsetting Fair Value | 0 |  |
Credit derivatives | Single name credit default swaps | A | Investment grade risk exposure |  |  |
Credit Derivatives [Line Items] |  |  |
Notional Amount |  |  | 169
Fair Value |  |  | $ 2
Weighted Average Years to Maturity |  |  | 4 years
Offsetting Notional Amount |  |  | $ 0
Offsetting Fair Value |  |  | 0
Credit derivatives | Basket credit default swaps | A Minus | Investment grade risk exposure |  |  |
Credit Derivatives [Line Items] |  |  |
Notional Amount |  |  | 11
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 | 550 |  | 799
Fair Value | $ 10 |  | $ (1)
Weighted Average Years to Maturity | 5 years |  | 6 years
Offsetting Notional Amount | $ 0 |  | $ 0
Offsetting Fair Value | 0 |  | 0
Credit derivatives | Basket credit default swaps | B Plus | Below investment grade risk exposure |  |  |
Credit Derivatives [Line Items] |  |  |
Notional Amount | 95 |  | 125
Fair Value | $ 6 |  | $ 2
Weighted Average Years to Maturity | 5 years |  | 5 years
Offsetting Notional Amount | $ 0 |  | $ 0
Offsetting Fair Value | 0 |  | 0
Credit derivatives | Basket credit default swaps | A | Investment grade risk exposure |  |  |
Credit Derivatives [Line Items] |  |  |
Notional Amount | 1 |  |
Fair Value | $ 0 |  |
Average Term of Credit Risk Derivatives Less than 1 Year | Less than 1 year |  |
Offsetting Notional Amount | $ 1 |  |
Offsetting Fair Value | 0 |  |
Credit derivatives | Basket credit default swaps | CCC | Below investment grade risk exposure |  |  |
Credit Derivatives [Line Items] |  |  |
Notional Amount | 18 |  | 19
Fair Value | $ (6) |  | (6)
Average Term of Credit Risk Derivatives Less than 1 Year | Less than 1 year | Less than 1 year |
Offsetting Notional Amount | $ 18 |  | 19
Offsetting Fair Value | $ 6 |  | $ 6

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- Definition Average Term of Credit Risk Derivatives Less than 1 Year + References No definition available. + Details
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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 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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