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Outstanding Exposure - Components of BIG Net Par Outstanding (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Schedule of Insured Financial Obligations [Line Items]    
Net $ 233,379 $ 236,392
Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 224,463 227,164
Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 6,639 6,837
Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 8,916 9,228
BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net 5,639 7,356
BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 4,295 5,972
BIG | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 115 119
BIG | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,344 1,384
BIG | BIG 1    
Schedule of Insured Financial Obligations [Line Items]    
Net 2,033 2,443
BIG | BIG 1 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,980 2,321
BIG | BIG 1 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 0 1
BIG | BIG 1 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 53 122
BIG | BIG 2    
Schedule of Insured Financial Obligations [Line Items]    
Net 236 181
BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 116 116
BIG | BIG 2 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 39 41
BIG | BIG 2 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 120 65
BIG | BIG 3    
Schedule of Insured Financial Obligations [Line Items]    
Net 3,370 4,732
BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 2,199 3,535
BIG | BIG 3 | Other structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 76 77
BIG | BIG 3 | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,171 1,197
UNITED STATES | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 175,957 177,219
UNITED STATES | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 2,277 2,391
UNITED STATES | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 8,101 8,374
UNITED STATES | BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 3,734 5,372
UNITED STATES | BIG | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,229 1,265
UNITED STATES | BIG | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,344 1,384
UNITED STATES | BIG | BIG 1 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,462 1,765
UNITED STATES | BIG | BIG 1 | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 53 121
UNITED STATES | BIG | BIG 2 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 116 116
UNITED STATES | BIG | BIG 2 | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 81 24
UNITED STATES | BIG | BIG 3 | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 2,156 3,491
UNITED STATES | BIG | BIG 3 | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Net 1,095 1,120
Non-U.S. public finance | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 48,506 49,945
Non-U.S. public finance | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 815 854
Non-U.S. public finance | BIG | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net 561 600
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 518 556
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 $ 43 $ 44