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Outstanding Exposure - Components of BIG Net Par Outstanding (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding $ 261,552 $ 249,153
Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 250,375 239,296
Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 9,670 8,083
Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 11,177 9,857
U.S.    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 209,628  
U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 201,175 190,289
U.S. | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 1,507 1,774
U.S. | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 8,453 8,632
Non U.S.    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 51,924  
Non U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 49,200 49,007
Non U.S. | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 2,724 1,225
BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 10,182 5,437
BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 9,286 4,402
BIG | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 77 94
BIG | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 896 1,035
BIG | U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 2,888 3,271
BIG | U.S. | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 819 941
BIG | U.S. | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 896 1,035
BIG | Non U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 6,398 1,131
BIG | Non U.S. | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 0 0
BIG | BIG 1    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 8,102 2,410
BIG | BIG 1 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 7,998 2,388
BIG | BIG 1 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 0 0
BIG | BIG 1 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 104 22
BIG | BIG 1 | U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 2,119 1,257
BIG | BIG 1 | U.S. | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 104 22
BIG | BIG 1 | Non U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 5,879 1,131
BIG | BIG 2    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 706 989
BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 656 926
BIG | BIG 2 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 21 27
BIG | BIG 2 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 50 63
BIG | BIG 2 | U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 137 926
BIG | BIG 2 | U.S. | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 29 36
BIG | BIG 2 | Non U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 519 0
BIG | BIG 3    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 1,374 2,038
BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 632 1,088
BIG | BIG 3 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 56 67
BIG | BIG 3 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 742 950
BIG | BIG 3 | U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 632 1,088
BIG | BIG 3 | U.S. | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 686 883
BIG | BIG 3 | Non U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding $ 0 $ 0