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Outstanding Exposure - Additional Information (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended
Aug. 31, 2021
Mar. 31, 2022
Mar. 15, 2022
Jan. 18, 2022
Dec. 31, 2021
Schedule of Insured Financial Obligations [Line Items]          
Loss mitigation securities and other   $ 1,200     $ 1,300
Net par outstanding   233,379     236,392
Residual value insurance policies exposure downgraded   1,616     1,605
Net Exposure   1,090     1,071
Guarantor, maximum exposure   257      
Puerto Rico          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   2,237     3,572
Puerto Rico | GO and PBA POA          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   41      
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   1,308     2,643
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO/PBA PSA          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   52     1,219
Cash received net of outbound reinsurance     $ 530    
Recovery bonds received, net     605    
Contingent value instruments received, net     258    
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO/PBA PSA | Second-to-Pay          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   10      
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO/PBA PSA | Assumed          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   1      
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO/PBA PSA | Direct          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   41      
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   47     1,097
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO | Second-to-Pay          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   10      
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO | Assumed          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   1      
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | GO | Direct          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   36      
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PBA          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   5     122
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PBA | Second-to-Pay          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   0      
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PBA | Assumed          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   0      
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PBA | Direct          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   5      
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | HTA/CCDA PSA          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   1,256     1,408
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PRHTA (Transportation revenue)          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   799     799
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PRHTA (Highway revenue)          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   457     457
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | Puerto Rico Convention Center District Authority          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   0     152
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PREPA          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   748     748
Puerto Rico | Puerto Rico Exposures Subject to a Plan or Support Agreement | PRIFA          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   0     16
Puerto Rico | Constitutionally Guaranteed | GO          
Schedule of Insured Financial Obligations [Line Items]          
Litigation amount       $ 35,000  
Puerto Rico | Constitutionally Guaranteed | GO and PBA POA          
Schedule of Insured Financial Obligations [Line Items]          
Amount of outstanding principal to be paid, in percent 100.00%        
Puerto Rico | Constitutionally Guaranteed | PRCCDA and PRIFA          
Schedule of Insured Financial Obligations [Line Items]          
Cash received for bonds     47    
Notional amount of contingent value instrument received for bonds     $ 98    
Puerto Rico | Pension Obligations | GO          
Schedule of Insured Financial Obligations [Line Items]          
Litigation amount       $ 50,000  
Puerto Rico | Other Public Corporations | University of Puerto Rico          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   1      
Puerto Rico | Other Public Corporations | PRASA (Puerto Rico Aqueduct and Sewer Authority)          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   1      
Puerto Rico | PRHTA          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   1,300      
U.S. Virgin Islands          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   443      
Principal amount upgraded (downgraded)   256      
Public finance          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   224,463     227,164
Structured finance          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   8,916     9,228
Commitment to Provide Guarantees | Public finance          
Schedule of Insured Financial Obligations [Line Items]          
Outstanding commitments to provide guaranties   1,174      
Commitment to Provide Guarantees | Structured finance          
Schedule of Insured Financial Obligations [Line Items]          
Outstanding commitments to provide guaranties   $ 860      
BIG          
Schedule of Insured Financial Obligations [Line Items]          
Maximum period of liquidity claims (in years)   1 year      
Net par outstanding   $ 5,639     7,356
Residual value insurance policies exposure downgraded   144     144
Net Exposure   84     84
BIG | Puerto Rico          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   2,237     3,572
Decrease in net par outstanding   1,335      
BIG | U.S. Virgin Islands          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   185     469
BIG | Public finance          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   4,295     5,972
BIG | Structured finance          
Schedule of Insured Financial Obligations [Line Items]          
Net par outstanding   $ 1,344     $ 1,384
Minimum          
Schedule of Insured Financial Obligations [Line Items]          
Probability of paying more claims than being reimbursed (as a percent)   50.00%