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Derivatives - Credit Risk Assumed through Credit Derivatives (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | $ 7,081 | $ 12,363
Fair Value | 45 | 7
Credit derivatives |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 493 | 499
Fair Value | 29 | 22
Offsetting Notional Amount | 493 | 499
Offsetting Fair Value | (29) | (22)
Standard & Poor's, AAA Rating [Member] | Basket credit default swaps | Credit derivatives | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 100 | 101
Fair Value | $ 0 | $ (1)
Weighted Average Years to Maturity | 4 years | 5 years
Offsetting Notional Amount | $ 100 | $ 101
Offsetting Fair Value | 0 | 1
B Plus | Basket credit default swaps | Credit derivatives | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 392 | 396
Fair Value | $ 30 | $ 24
Weighted Average Years to Maturity | 3 years | 4 years
Offsetting Notional Amount | $ 392 | $ 396
Offsetting Fair Value | (30) | (24)
CCC Minus | Basket credit default swaps | Credit derivatives | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount |  | 2
Fair Value |  | $ (1)
Average Term of Credit Risk Derivatives Less than 1 Year |  | Less than 1 year
Offsetting Notional Amount |  | $ 2
Offsetting Fair Value |  | $ 1
Standard & Poor's, CCC Rating | Basket credit default swaps | Credit derivatives | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 1 |
Fair Value | $ (1) |
Average Term of Credit Risk Derivatives Less than 1 Year | Less than 1 year |
Offsetting Notional Amount | $ 1 |
Offsetting Fair Value | $ 1 |

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (a)(1) -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K + 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 -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-8 + 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 -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A + Details
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