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Outstanding Exposure - Financial Guaranty Portfolio by Asset Class (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding $ 261,552 $ 249,153
Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 250,375 239,296
Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 11,177 9,857
U.S.    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 209,628  
U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 201,175 190,289
U.S. | Public finance | General obligation    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 78,162 74,609
U.S. | Public finance | Tax backed    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 33,288 33,060
U.S. | Public finance | Municipal utilities    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 30,036 29,300
U.S. | Public finance | Transportation    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 26,958 22,052
U.S. | Public finance | Healthcare    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 14,007 12,604
U.S. | Public finance | Infrastructure finance    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 8,663 8,796
U.S. | Public finance | Higher education    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 7,381 7,250
U.S. | Public finance | Housing revenue    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 1,272 1,152
U.S. | Public finance | Investor-owned utilities    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 325 329
U.S. | Public finance | Renewable energy    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 164 167
U.S. | Public finance | Other    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 919 970
U.S. | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 8,453 8,632
U.S. | Structured finance | Other    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 955 892
U.S. | Structured finance | Insurance securitizations    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 4,495 4,379
U.S. | Structured finance | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 1,507 1,774
U.S. | Structured finance | Pooled corporate obligations    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 607 631
U.S. | Structured finance | Financial products    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 492 464
U.S. | Structured finance | Consumer receivables    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 212 314
U.S. | Structured finance | Subscription finance facilities    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 185 178
Non U.S.    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 51,924  
Non U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 49,200 49,007
Non U.S. | Public finance | Infrastructure finance    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 14,961 15,430
Non U.S. | Public finance | Renewable energy    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 1,596 2,030
Non U.S. | Public finance | Regulated utilities    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 22,361 20,545
Non U.S. | Public finance | Sovereign and sub-sovereign    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 9,181 9,869
Non U.S. | Public finance | Pooled infrastructure    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 1,101 1,133
Non U.S. | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 2,724 1,225
Non U.S. | Structured finance | Other    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 650 104
Non U.S. | Structured finance | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 221 252
Non U.S. | Structured finance | Pooled corporate obligations    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 468 425
Non U.S. | Structured finance | Subscription finance facilities    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding $ 1,385 $ 444