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Derivatives - Credit Risk Assumed through Credit Derivatives (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | $ 7,416 | $ 7,081
Fair Value | (8) | 45
Credit derivatives |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 493 | 493
Fair Value | 27 | 29
Derivative, Nominal Value, Amount Offset Against Collateral, Net | 493 | 493
Offsetting Fair Value | (27) | (29)
Standard & Poor's, AAA Rating [Member] | Basket credit default swaps | Credit derivatives | Investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 100 | 100
Fair Value | $ 1 | $ 0
Weighted Average Years to Maturity | 3 years | 4 years
Derivative, Nominal Value, Amount Offset Against Collateral, Net | $ 100 | $ 100
Offsetting Fair Value | (1) | 0
Standard & Poor's, B+ Rating | Basket credit default swaps | Credit derivatives | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 392 | 392
Fair Value | $ 27 | $ 30
Weighted Average Years to Maturity | 3 years | 3 years
Derivative, Nominal Value, Amount Offset Against Collateral, Net | $ 392 | $ 392
Offsetting Fair Value | (27) | (30)
Standard & Poor's, CCC Rating | Basket credit default swaps | Credit derivatives | Below investment grade risk exposure |  |
Credit Derivatives [Line Items] |  |
Derivative, Notional Amount | 1 | 1
Fair Value | $ (1) | $ (1)
Average Term of Credit Risk Derivatives Less than 1 Year | Less than 1 year | Less than 1 year
Derivative, Nominal Value, Amount Offset Against Collateral, Net | $ 1 | $ 1
Offsetting Fair Value | $ 1 | $ 1

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (a)(1) -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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4L -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4L Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4K -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K + Details
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