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Outstanding Exposure - Components of BIG Net Par Outstanding (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Schedule of Insured Financial Obligations [Line Items]    
Net $ 258,196 $ 249,153
Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 247,920 239,296
Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 8,730 8,083
Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 10,276 9,857
BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net 10,650 5,437
BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 9,739 4,402
BIG | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 80 94
BIG | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 911 1,035
BIG | BIG 1    
Schedule of Insured Financial Obligations [Line Items]    
Net 7,485 2,410
BIG | BIG 1 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 7,394 2,388
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 91 22
BIG | BIG 2    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,550 989
BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,499 926
BIG | BIG 2 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 22 27
BIG | BIG 2 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 51 63
BIG | BIG 3    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,615 2,038
BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 846 1,088
BIG | BIG 3 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 58 67
BIG | BIG 3 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 769 950
United States | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 195,837 190,289
United States | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,546 1,774
United States | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 8,717 8,632
United States | BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 3,132 3,271
United States | BIG | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 831 941
United States | BIG | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 911 1,035
United States | BIG | BIG 1 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,342 1,257
United States | BIG | BIG 1 | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 91 22
United States | BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 944 926
United States | BIG | BIG 2 | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 29 36
United States | BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 846 1,088
United States | BIG | BIG 3 | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 711 883
Non-U.S. public finance | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 52,083 49,007
Non-U.S. public finance | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,559 1,225
Non-U.S. public finance | BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 6,607 1,131
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 6,052 1,131
Non-U.S. public finance | BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 555 0
Non-U.S. public finance | BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 0 $ 0