v3.25.2
Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Additional Information (Details)
Jun. 30, 2025
USD ($)
policy
Entity
Dec. 31, 2024
USD ($)
policy
Entity
Variable Interest Entity [Line Items]    
Assets $ 12,095,000,000 $ 11,901,000,000
Number of policies monitored | policy 15,000  
Number of policies monitored, not within the scope of ASC 810 | policy 14,000  
Number of policies that contain provisions for consolidation | policy 51 50
Net fair value gains and losses on FG VIEs are expected to reverse to zero at maturity of the VIE debt $ 798,000,000  
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum loss exposure 0  
Assets $ 211,000,000 $ 147,000,000
Financial Guaranty Variable Interest Entities | Variable Interest Entity, Primary Beneficiary | Structured finance    
Variable Interest Entity [Line Items]    
Number of entities | Entity 24 23
Consolidated Investment Vehicles | Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total number of entities consolidated | Entity 1 1
Assets $ 121,000,000 $ 101,000,000