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Outstanding Exposure - Components of BIG Net Par Outstanding (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Schedule of Insured Financial Obligations [Line Items]    
Net $ 244,013 $ 233,258
Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 233,981 224,099
Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 8,169 7,203
Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 10,032 9,159
BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net 5,634 5,892
BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 4,566 4,777
BIG | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 98 105
BIG | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,068 1,115
BIG | BIG 1    
Schedule of Insured Financial Obligations [Line Items]    
Net 2,326 3,363
BIG | BIG 1 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 2,315 3,345
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 11 18
BIG | BIG 2    
Schedule of Insured Financial Obligations [Line Items]    
Net 999 181
BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 931 108
BIG | BIG 2 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 31 34
BIG | BIG 2 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 68 73
BIG | BIG 3    
Schedule of Insured Financial Obligations [Line Items]    
Net 2,309 2,348
BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,320 1,324
BIG | BIG 3 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 67 71
BIG | BIG 3 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 989 1,024
United States | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 186,323 179,636
United States | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,863 1,956
United States | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 8,827 8,228
United States | BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 3,540 3,796
United States | BIG | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 970 1,010
United States | BIG | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,068 1,115
United States | BIG | BIG 1 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,289 2,364
United States | BIG | BIG 1 | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 11 18
United States | BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 931 108
United States | BIG | BIG 2 | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 37 39
United States | BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,320 1,324
United States | BIG | BIG 3 | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 922 953
Non-U.S. public finance | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 47,658 44,463
Non-U.S. public finance | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,205 931
Non-U.S. public finance | BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,026 981
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 1,026 981
Non-U.S. public finance | BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 0 0
Non-U.S. public finance | BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 0 $ 0