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Outstanding Exposure - Components of BIG Net Par Outstanding (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Schedule of Insured Financial Obligations [Line Items]    
Net $ 274,875 $ 261,552
Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 263,418 250,375
Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 10,057 9,670
Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 11,457 11,177
BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net 11,378 10,182
BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 10,525 9,286
BIG | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 73 77
BIG | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 853 896
BIG | BIG 1    
Schedule of Insured Financial Obligations [Line Items]    
Net 7,251 8,102
BIG | BIG 1 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 7,078 7,998
BIG | BIG 1 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 0 0
BIG | BIG 1 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 173 104
BIG | BIG 2    
Schedule of Insured Financial Obligations [Line Items]    
Net 2,897 706
BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 2,851 656
BIG | BIG 2 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 18 21
BIG | BIG 2 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 46 50
BIG | BIG 3    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,230 1,374
BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 596 632
BIG | BIG 3 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 55 56
BIG | BIG 3 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 634 742
United States | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 212,091 201,175
United States | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,400 1,507
United States | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 8,102 8,453
United States | BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 3,596 2,888
United States | BIG | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 780 819
United States | BIG | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 853 896
United States | BIG | BIG 1 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 2,584 2,119
United States | BIG | BIG 1 | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 173 104
United States | BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 416 137
United States | BIG | BIG 2 | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 28 29
United States | BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 596 632
United States | BIG | BIG 3 | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 579 686
Non-U.S. public finance | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 51,327 49,200
Non-U.S. public finance | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 3,355 2,724
Non-U.S. public finance | BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 6,929 6,398
Non-U.S. public finance | BIG | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 0 0
Non-U.S. public finance | BIG | BIG 1 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 4,494 5,879
Non-U.S. public finance | BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 2,435 519
Non-U.S. public finance | BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 0 $ 0