Fair Value Measurement - Fair Value of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
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| Carrying amount and estimated fair value financial instruments | ||
| Other assets (including other invested assets) | $ 695 | $ 746 |
| Long-term debt | (1,701) | (1,699) |
| Other liabilities | (473) | (498) |
| Carrying Amount | ||
| Carrying amount and estimated fair value financial instruments | ||
| Other assets (including other invested assets) | 97 | 115 |
| Financial guaranty insurance contracts | (1,962) | (2,029) |
| Long-term debt | (1,701) | (1,699) |
| Other liabilities | (17) | (16) |
| Estimated Fair Value | ||
| Carrying amount and estimated fair value financial instruments | ||
| Other assets (including other invested assets) | 98 | 116 |
| Financial guaranty insurance contracts | (1,081) | (1,136) |
| Long-term debt | (1,602) | (1,579) |
| Other liabilities | $ (17) | $ (16) |
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- Definition This element represents the net financial guaranty contract position for the entity, consisting of premiums receivable, ceded unearned premium reserve, reinsurance recoverable on unpaid losses, salvage and subrogation recoverable, unearned premium reserve, loss and loss adjustment expense reserve, and reinsurance balances payable, net. No definition available.
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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. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of assets classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of liabilities classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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