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Outstanding Exposure - Narrative (Details) - USD ($)
$ in Millions
Jun. 26, 2023
Dec. 31, 2024
Dec. 31, 2023
Schedule of Insured Financial Obligations [Line Items]      
Loss mitigation securities   $ 1,200.0 $ 1,200.0
Net Par Outstanding   261,552.0 249,153.0
Fixed-maturity securities, trading, at fair value   147.0 318.0
Contingent Value Instruments      
Schedule of Insured Financial Obligations [Line Items]      
Fixed-maturity securities, trading, at fair value   123.0  
PREPA | Guarantee Obligations      
Schedule of Insured Financial Obligations [Line Items]      
Damages sought, estimate $ 2,400.0    
Damages sought, value $ 8,500.0    
Puerto Rico      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding   637.0 1,105.0
Puerto Rico | Other Puerto Rico Exposures      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding   92.0 109.0
Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding   250,375.0 239,296.0
Public finance | Commitment to Provide Guarantees      
Schedule of Insured Financial Obligations [Line Items]      
Outstanding commitments to provide guaranties   196.0  
Potential future commitment     353.0
Structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding   11,177.0 9,857.0
Structured finance | Commitment to Provide Guarantees      
Schedule of Insured Financial Obligations [Line Items]      
Outstanding commitments to provide guaranties   1,500.0  
Potential future commitment     50.0
Aircraft residual value insurance      
Schedule of Insured Financial Obligations [Line Items]      
Specialty business, gross par   147.0 355.0
Specialty business, net par   87.0 200.0
Specialty business, contingent, gross   90.0  
Specialty business, contingent, net   51.0  
BIG      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding   10,182.0 5,437.0
BIG | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding   9,286.0 4,402.0
BIG | Structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding   896.0 1,035.0
BIG | Aircraft residual value insurance      
Schedule of Insured Financial Obligations [Line Items]      
Specialty business, gross par   5.0 144.0
Specialty business, net par   $ 5.0 $ 84.0
Minimum      
Schedule of Insured Financial Obligations [Line Items]      
Probability of paying more claims than being reimbursed (as a percent)   50.00%