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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Consolidated FG VIE's By Type of Collateral (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Total assets | $ 11,901 | $ 12,539 |
Total liabilities | 6,348 | 6,774 |
Cash | 121 | 97 | $ 107
Variable Interest Entity, Primary Beneficiary | Recourse | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total liabilities | 155 | 543 |
Variable Interest Entity, Primary Beneficiary | Nonrecourse | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total liabilities | 9 | 11 |
Variable Interest Entity, Primary Beneficiary | RMBS | U.S. | Recourse | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total liabilities | 155 | 177 |
Variable Interest Entity, Primary Beneficiary | RMBS | U.S. | Nonrecourse | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total liabilities | 9 | 11 |
Variable Interest Entity, Primary Beneficiary | Puerto Rico Trusts | Recourse | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total liabilities | 0 | 366 |
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | 147 | 328 |
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities | RMBS | U.S. |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | 147 | 173 |
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities | Puerto Rico Trusts |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | $ 0 | 155 |
Asset, fair value |  | 1 |
Cash |  | $ 154 |

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