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Derivative Instruments - Derivatives - Credit Risk Assumed through Credit Derivatives (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | $ 11,366 | $ 12,129
Fair Value | (45) | (61)
Credit derivatives |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 332 | 784
Fair Value | 9 | 18
Offsetting Notional Amount | 107 | 109
Offsetting Fair Value | 2 | 3
Credit derivatives | Single name credit default swaps | A Minus | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount |  | 175
Fair Value |  | $ 9
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] |  |
Derivative, Notional Amount | 50 |
Fair Value | $ 1 |
Weighted Average Years to Maturity | 5 years |
Offsetting Notional Amount | $ 0 |
Offsetting Fair Value | 0 |
Credit derivatives | Basket credit default swaps | BBB Plus | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 100 | 500
Fair Value | $ 2 | $ 12
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 | Standard & Poor's, AAA Rating [Member] | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 100 | 100
Fair Value | $ 1 | $ 1
Weighted Average Years to Maturity | 7 years | 8 years
Offsetting Notional Amount | $ 100 | $ 100
Offsetting Fair Value | (1) | (1)
Credit derivatives | Basket credit default swaps | Standard & Poor's, B+ Rating | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 75 |
Fair Value | $ 8 |
Weighted Average Years to Maturity | 5 years |
Offsetting Notional Amount | $ 0 |
Offsetting Fair Value | 0 |
Credit derivatives | Basket credit default swaps | Standard & Poor's, CCC+ Rating | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount |  | 9
Fair Value |  | $ (4)
Average Term of Credit Risk Derivatives Less than 1 Year |  | Less than 1 year
Offsetting Notional Amount |  | $ 9
Offsetting Fair Value |  | $ 4
Credit derivatives | Basket credit default swaps | Standard & Poor's, B- Rating | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 7 |
Fair Value | $ (3) |
Average Term of Credit Risk Derivatives Less than 1 Year | Less than 1 year |
Offsetting Notional Amount | $ 7 |
Offsetting Fair Value | $ 3 |

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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=125515794&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=125515794&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=123594938&loc=d3e13433-108611 + Details
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