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Outstanding Exposure - Components of BIG Net Par Outstanding (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Aug. 31, 2023
Dec. 31, 2022
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding $ 249,153 $ 108 $ 233,258
Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 239,296   224,099
Other structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 8,083   7,203
Structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 9,857   9,159
U.S.      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 198,921    
U.S. | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 190,289   179,636
U.S. | RMBS      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 1,774   1,956
U.S. | Structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 8,632   8,228
Non U.S.      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 50,232    
Non U.S. | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 49,007   44,463
Non U.S. | Structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 1,225   931
BIG      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 5,437   5,892
BIG | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 4,402   4,777
BIG | Other structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 94   105
BIG | Structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 1,035   1,115
BIG | U.S. | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 3,271   3,796
BIG | U.S. | RMBS      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 941   1,010
BIG | U.S. | Structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 1,035   1,115
BIG | Non U.S. | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 1,131   981
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 2,410   3,363
BIG | BIG 1 | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 2,388   3,345
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 22   18
BIG | BIG 1 | U.S. | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 1,257   2,364
BIG | BIG 1 | U.S. | RMBS      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 22   18
BIG | BIG 1 | Non U.S. | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 1,131   981
BIG | BIG 2      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 989   181
BIG | BIG 2 | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 926   108
BIG | BIG 2 | Other structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 27   34
BIG | BIG 2 | Structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 63   73
BIG | BIG 2 | U.S. | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 926   108
BIG | BIG 2 | U.S. | RMBS      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 36   39
BIG | BIG 2 | Non U.S. | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 0   0
BIG | BIG 3      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 2,038   2,348
BIG | BIG 3 | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 1,088   1,324
BIG | BIG 3 | Other structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 67   71
BIG | BIG 3 | Structured finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 950   1,024
BIG | BIG 3 | U.S. | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 1,088   1,324
BIG | BIG 3 | U.S. | RMBS      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding 883   953
BIG | BIG 3 | Non U.S. | Public finance      
Schedule of Insured Financial Obligations [Line Items]      
Net Par Outstanding $ 0   $ 0