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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 | 6 Months Ended |
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Jun. 30, 2023 cLOWarehouse consolidatedInvestmentVehicle Entity consolidatedInvestmentFund consolidatedCLO | Jun. 30, 2022 USD ($) Entity | Dec. 31, 2022 consolidatedInvestmentFund consolidatedCLO cLOWarehouse consolidatedInvestmentVehicle
Variable Interest Entity [Line Items] |  |  |
Total number of entities consolidated | consolidatedInvestmentVehicle | 18 |  | 22
Investment Managed Funds |  |  |
Variable Interest Entity [Line Items] |  |  |
Total number of entities consolidated | consolidatedInvestmentFund | 6 |  | 8
Number of entities deconsolidated in the period | 2 |  |
Number of entities consolidated in the period |  | 1 |
CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Total number of entities consolidated | consolidatedCLO | 10 |  | 10
Deconsolidation, net assets | $ |  | $ 417 |
Collateralized Loan Obligation Warehouses |  |  |
Variable Interest Entity [Line Items] |  |  |
Total number of entities consolidated | cLOWarehouse | 2 |  | 4
Number of entities deconsolidated in the period | 2 |  |
Number of entities consolidated in the period |  | 1 |

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