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Expected Loss to be Paid (Recovered) - Additional Information (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Payment
scenario
Curve
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
scenario
Dec. 31, 2020
USD ($)
Schedule of Expected Losses to be Paid [Line Items]        
Period of insured credit performance of guaranteed obligations (in some cases over) 30 years      
Discount factor (as a percent) 2.26%   1.02%  
Net Expected Loss to be Paid (Recovered) $ 432 $ 472 $ 411 $ 529
Loss and LAE Reserve paid 13 4    
Expected LAE to be paid 17   26  
Ceded expected loss to be recovered (paid) (2)   10  
Net par outstanding 233,379   236,392  
Net economic loss development (benefit) $ (44) 13    
Additional loss recovery assumption, recovery period 5 years      
Loss recovery assumption, additional increase in recovery projection, percent 40.00%      
Loss recovery assumption, additional increase in recovery projection, economic benefit $ 40      
Loss recovery assumption, additional decrease in recovery projection, percent 20.00%      
Loss recovery assumption, additional decrease in recovery projection, economic loss $ 40      
Public Finance Stockton Pension Obligation Bonds        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 100      
Public finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net Expected Loss to be Paid (Recovered) 191 252 209 341
Net par outstanding 224,463   227,164  
Net economic loss development (benefit) (50) 3    
Other structured finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net Expected Loss to be Paid (Recovered) 46 39 52 40
Net par outstanding 6,639   6,837  
Net economic loss development (benefit) (1) (1)    
BIG        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 5,639   7,356  
BIG | Public finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 4,295   5,972  
BIG | Other structured finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 115   $ 119  
BIG | Student Loan        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 53      
BIG | Life insurance transactions        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding $ 40      
UNITED STATES        
Schedule of Expected Losses to be Paid [Line Items]        
Net expected loss to be paid after recoveries for representations and warranties, percent 98.00%   97.20%  
UNITED STATES | Public finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net Expected Loss to be Paid (Recovered) $ 181 228 $ 197 305
Net par outstanding 175,957   177,219  
Net economic loss development (benefit) (48) 15    
UNITED STATES | RMBS        
Schedule of Expected Losses to be Paid [Line Items]        
Net Expected Loss to be Paid (Recovered) 195 181 150 $ 148
Net par outstanding 2,277   2,391  
Net economic loss development (benefit) $ 7 11    
UNITED STATES | RMBS | Second Lien        
Schedule of Expected Losses to be Paid [Line Items]        
Period from plateau to intermediate conditional default rate (in months) 28 months      
UNITED STATES | RMBS | Home Equity Line of Credit        
Schedule of Expected Losses to be Paid [Line Items]        
Final CPR 1.00%      
UNITED STATES | RMBS | First Lien        
Schedule of Expected Losses to be Paid [Line Items]        
Net Expected Loss to be Paid (Recovered) $ 204   $ 167  
Net economic loss development (benefit) $ 18 25    
Number of delinquent payments | Payment 2      
Projected loss assumptions, CDR, plateau rate, projection period 36 months      
Projected loss assumptions, final CPR, period for voluntary prepayments to continue 12 months      
Percent of deferred loan balances to be recovered 20.00%      
Intermediate conditional default rate (as a percent) 5.00%      
Number of scenarios weighted in estimating expected losses | scenario 5   5  
UNITED STATES | RMBS | First Lien | Base Scenario        
Schedule of Expected Losses to be Paid [Line Items]        
Projected loss assumptions, CDR, plateau rate, projection period 36 months      
Period from plateau to intermediate conditional default rate (in months) 12 months      
Intermediate conditional default rate as a percentage of plateau conditional default rate 20.00%      
Final conditional default rate as a percentage of plateau conditional default rate 5.00%      
Projected loss assumptions, final CPR, period for voluntary prepayments to continue 1 year 3 months      
Default from delinquentor rate, term 36 months      
Performing or projected to reperform, projection period 36 months      
Projected loss assumptions, loss severity, subsequent period 18 months      
Estimated loss severity rate, one through six months (as a percent) 18 months      
Loss severity (as a percent) 40.00%      
Projected loss assumptions, period to reach final loss severity rate 2 years 6 months      
Final CPR 15.00%      
UNITED STATES | RMBS | First Lien | More Stressful Environment        
Schedule of Expected Losses to be Paid [Line Items]        
Period from plateau to intermediate conditional default rate (in months) 15 months      
Projected loss assumptions, increase (decrease) in expected loss to be paid, net $ (20)      
UNITED STATES | RMBS | First Lien | Least Stressful Environment        
Schedule of Expected Losses to be Paid [Line Items]        
Projected loss assumptions, CDR, plateau rate, projection period 30 months      
Period from plateau to intermediate conditional default rate (in months) 9 months      
Projected loss assumptions, increase (decrease) in expected loss to be paid, net $ 12      
Decrease in the plateau period used to calculate potential change in loss estimate (in months) 6 months      
UNITED STATES | RMBS | First Lien | Most Stressful        
Schedule of Expected Losses to be Paid [Line Items]        
Projected loss assumptions, period to reach final loss severity rate 9 years      
UNITED STATES | RMBS | Second Lien        
Schedule of Expected Losses to be Paid [Line Items]        
Net Expected Loss to be Paid (Recovered) $ (9)   $ 17  
Net economic loss development (benefit) $ (11) $ (14)    
Period from plateau to intermediate conditional default rate (in months) 28 months      
Period of loan default estimate 6 months      
Number of preceding months average liquidation rates used to estimate loan default rate 6 months      
Projected loss assumptions, period of consistent conditional default rate 6 months      
Stress period (in months) 34 months      
Monthly delinquency threshold 6 months      
Loss recovery assumption (as a percent) 2.00%   2.00%  
Number of conditional default rate curves modeled in estimating losses | Curve 5      
Liquidation rate 30.00%      
UNITED STATES | RMBS | Second Lien | Home Equity Line of Credit and Closed-end Mortgage        
Schedule of Expected Losses to be Paid [Line Items]        
Final CPR 15.00%      
UNITED STATES | RMBS | Second Lien | Base Scenario        
Schedule of Expected Losses to be Paid [Line Items]        
Stress period (in months) 34 months      
UNITED STATES | RMBS | Second Lien | Most Stressful        
Schedule of Expected Losses to be Paid [Line Items]        
Projected loss assumptions, CDR, plateau rate, projection period 8 months      
Period from plateau to intermediate conditional default rate (in months) 31 months      
Stress period (in months) 39 months      
Increase in conditional default rate ramp down period 3 months      
UNITED STATES | RMBS | Second Lien | Most Stressful | Home Equity Line of Credit        
Schedule of Expected Losses to be Paid [Line Items]        
Change in estimate for increased conditional default rate plateau period $ 5      
UNITED STATES | RMBS | Second Lien | Least Stressful        
Schedule of Expected Losses to be Paid [Line Items]        
Stress period (in months) 29 months      
Period of constant conditional default rate (in months) 4 months      
Decreased conditional default rate ramp down period 25 months      
Change in estimate for decreased prepayment rate, Percent 10.00%      
UNITED STATES | RMBS | Second Lien | Least Stressful | Home Equity Line of Credit        
Schedule of Expected Losses to be Paid [Line Items]        
Change in estimate for decreased conditional default rate ramp down period $ 6      
UNITED STATES | Home Equity Line of Credit        
Schedule of Expected Losses to be Paid [Line Items]        
Initial period for which borrower can pay only interest payments 10 years      
UNITED STATES | BIG | Public finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding $ 3,734   $ 5,372  
UNITED STATES | BIG | RMBS        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 1,229   1,265  
Puerto Rico        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 2,237   3,572  
Puerto Rico | BIG        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 2,237   3,572  
Non United States | Public finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net Expected Loss to be Paid (Recovered) 10   $ 12  
Net economic loss development (benefit) $ 2      
Minimum        
Schedule of Expected Losses to be Paid [Line Items]        
Risk free discount rate 0.00%   0.00%  
Maximum        
Schedule of Expected Losses to be Paid [Line Items]        
Risk free discount rate 2.61%   1.98%