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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Roll Forward of Number of Consolidated CIVs (Details) (Details) - Variable Interest Entity, Primary Beneficiary - Consolidated investment vehicles
 12 Months Ended
Dec. 31, 2024
entity
Dec. 31, 2023
entity
Dec. 31, 2022
fund
entity
Dec. 31, 2021
entity
Variable Interest Entity [Line Items]        
Number of financial assets securitized | fund     2  
Schedule of Consolidated FG VIEs Rollforward [Roll Forward]        
Consolidated 0 0 4  
Deconsolidated (1) (19) (2)  
December 31 2 3 22 20