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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Total assets | $ 12,539 | $ 16,843 |
Total liabilities | 6,774 | 11,551 |
Cash | 97 | 107 | $ 120
Variable Interest Entity, Primary Beneficiary | Recourse | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total liabilities | 543 | 702 |
Variable Interest Entity, Primary Beneficiary | Nonrecourse | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total liabilities | 11 | 13 |
Variable Interest Entity, Primary Beneficiary | RMBS | U.S. | First Lien | Recourse | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total liabilities | 156 | 176 |
Variable Interest Entity, Primary Beneficiary | RMBS | U.S. | First Lien | Nonrecourse | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total liabilities | 11 | 13 |
Variable Interest Entity, Primary Beneficiary | RMBS | U.S. | Second Lien | Recourse | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total liabilities | 21 | 24 |
Variable Interest Entity, Primary Beneficiary | Puerto Rico Trusts | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total liabilities | 366 | 495 |
Variable Interest Entity, Primary Beneficiary | Other | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total liabilities | 0 | 7 |
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | 328 | 416 |
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities | RMBS | U.S. | First Lien |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | 145 | 167 |
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities | RMBS | U.S. | Second Lien |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | 28 | 30 |
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities | Puerto Rico Trusts |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | 155 | 212 |
Asset, fair value | 1 | 209 |
Cash | 154 | 2 |
Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities | Other |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | $ 0 | $ 7 |

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