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Outstanding Exposure - Components of BIG Net Par Outstanding (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding $ 233,258 $ 236,392
Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 224,099 227,164
Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 7,203 6,837
Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 9,159 9,228
U.S.    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 187,864  
U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 179,636 177,219
U.S. | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 1,956 2,391
U.S. | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 8,228 8,374
Non U.S.    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 45,394  
Non U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 44,463 49,945
Non U.S. | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 931 854
BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 5,892 7,356
BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 4,777 5,972
BIG | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 105 119
BIG | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 1,115 1,384
BIG | U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 3,796 5,372
BIG | U.S. | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 1,010 1,265
BIG | U.S. | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 1,115 1,384
BIG | Non U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 981 600
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 3,363 2,443
BIG | BIG 1 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 3,345 2,321
BIG | BIG 1 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 0 1
BIG | BIG 1 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 18 122
BIG | BIG 1 | U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 2,364 1,765
BIG | BIG 1 | U.S. | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 18 121
BIG | BIG 1 | Non U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 981 556
BIG | BIG 2    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 181 181
BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 108 116
BIG | BIG 2 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 34 41
BIG | BIG 2 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 73 65
BIG | BIG 2 | U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 108 116
BIG | BIG 2 | U.S. | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 39 24
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 2,348 4,732
BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 1,324 3,535
BIG | BIG 3 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 71 77
BIG | BIG 3 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 1,024 1,197
BIG | BIG 3 | U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 1,324 3,491
BIG | BIG 3 | U.S. | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding 953 1,120
BIG | BIG 3 | Non U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding $ 0 $ 44