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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, 2020 | Dec. 31, 2019
Credit Derivatives [Line Items] |  |
Fair Value | $ (56) | $ (66)
Derivative, Notional Amount | 11,854 | 13,706
Credit Default Swap, Selling Protection [Member] |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 263 | 515
Credit derivatives |  |
Credit Derivatives [Line Items] |  |
Fair Value | (6) | 8
Offsetting Notional Amount | 13 | 15
Offsetting Fair Value | 4 | 5
Credit derivatives | Single name credit default swaps | A Minus | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Fair Value | $ (1) | $ 3
Weighted Average Years to Maturity | 5 years | 5 years
Offsetting Notional Amount | $ 0 | $ 0
Offsetting Fair Value | 0 | 0
Derivative, Notional Amount | 100 | 100
Credit derivatives | Basket credit default swaps | BBB Plus | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Fair Value | $ (1) | $ 10
Weighted Average Years to Maturity | 5 years | 5 years
Offsetting Notional Amount | $ 0 | $ 0
Offsetting Fair Value | 0 | 0
Derivative, Notional Amount | 150 | 400
Credit derivatives | Basket credit default swaps | A | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
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
Derivative, Notional Amount |  | 1
Credit derivatives | Basket credit default swaps | CCC Minus | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Fair Value | $ (4) | $ (5)
Average Term of Credit Risk Derivatives Less than 1 Year | Less than 1 year | Less than 1 year
Offsetting Notional Amount | $ 13 | $ 14
Offsetting Fair Value | 4 | 5
Derivative, Notional Amount | $ 13 | $ 14

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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 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 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=118260190&loc=d3e13433-108611 + Details
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