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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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