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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Number of Consolidated CIVs by Type (Details) - Variable Interest Entity, Primary Beneficiary - Consolidated Investment Vehicles $ in Millions | Sep. 30, 2023 consolidatedInvestmentFund consolidatedCLO cLOWarehouse consolidatedInvestmentVehicle | Dec. 31, 2022 consolidatedInvestmentVehicle consolidatedInvestmentFund consolidatedCLO cLOWarehouse | Sep. 30, 2022 USD ($)
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Total number of entities consolidated | consolidatedInvestmentVehicle | 3 | 22 |
Investment Managed Funds |  |  |
Variable Interest Entity [Line Items] |  |  |
Total number of entities consolidated | consolidatedInvestmentFund | 3 | 8 |
CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Total number of entities consolidated | consolidatedCLO | 0 | 10 |
Deconsolidation, net assets | $ |  |  | $ 417
Collateralized Loan Obligation Warehouses |  |  |
Variable Interest Entity [Line Items] |  |  |
Total number of entities consolidated | cLOWarehouse | 0 | 4 |

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