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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
	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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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