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Expected Loss to be Paid (Recovered) - Additional Information (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
scenario
Payment
Curve
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
scenario
Dec. 31, 2021
USD ($)
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) 3.75%   4.08%  
Net Expected Loss to be Paid (Recovered) $ 517 $ 432 $ 522 $ 411
Loss and LAE Reserve paid 3 13    
Expected LAE to be paid 9   11  
Net par outstanding 236,383   233,258  
Net economic loss development (benefit) $ 11 (44)    
Additional loss recovery assumption, recovery period 5 years      
First Lien        
Schedule of Expected Losses to be Paid [Line Items]        
Effect of recovery $ 1      
Second Lien        
Schedule of Expected Losses to be Paid [Line Items]        
Effect of recovery 1      
Public finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net Expected Loss to be Paid (Recovered) 393 191 412 209
Net par outstanding 226,746   224,099  
Net economic loss development (benefit) 5 (50)    
Other structured finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net Expected Loss to be Paid (Recovered) 42 46 44 52
Net par outstanding 7,727   7,203  
Net economic loss development (benefit) 1 (1)    
BIG        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 5,882   5,892  
BIG | Public finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 4,794   4,777  
BIG | Other structured finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 100   $ 105  
BIG | Student Loan        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 46      
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 97.60%   98.50%  
United States | Public finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net Expected Loss to be Paid (Recovered) $ 380 181 $ 403 197
Net par outstanding 180,837   179,636  
Net economic loss development (benefit) 1 (48)    
United States | RMBS        
Schedule of Expected Losses to be Paid [Line Items]        
Net Expected Loss to be Paid (Recovered) 82 195 66 $ 150
Net par outstanding 1,910   $ 1,956  
Net economic loss development (benefit) 5 7    
United States | RMBS | First Lien        
Schedule of Expected Losses to be Paid [Line Items]        
Net economic loss development (benefit) $ 0 $ 18    
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      
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 | Pessimistic Scenario        
Schedule of Expected Losses to be Paid [Line Items]        
Percent of deferred loan balances to be recovered 10.00%      
United States | RMBS | First Lien | Optimistic Scenario        
Schedule of Expected Losses to be Paid [Line Items]        
Percent of deferred loan balances to be recovered 50.00%      
United States | RMBS | First Lien | Base Scenario        
Schedule of Expected Losses to be Paid [Line Items]        
Percent of deferred loan balances to be recovered 20.00% 20.00%    
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      
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      
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) 16 months      
Projected loss assumptions, period to reach final loss severity rate 9 years      
Percent of deferred loan balances to be recovered 10.00%      
Projected loss assumptions, increase (decrease) in expected loss to be paid, net $ 23      
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) 8 months      
Percent of deferred loan balances to be recovered 50.00%      
Projected loss assumptions, increase (decrease) in expected loss to be paid, net $ (33)      
Decrease in the plateau period used to calculate potential change in loss estimate (in months) 6 months      
United States | RMBS | Second Lien        
Schedule of Expected Losses to be Paid [Line Items]        
Net economic loss development (benefit) $ 5 $ (11)    
Projected loss assumptions, period of consistent conditional default rate 36 months      
Period of conditional default rate downward trend 1 year      
Percent of original period of consistent conditional default rate 5.00%      
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 | Pessimistic Scenario        
Schedule of Expected Losses to be Paid [Line Items]        
Percent of deferred loan balances to be recovered 10.00%      
United States | RMBS | Second Lien | Optimistic Scenario        
Schedule of Expected Losses to be Paid [Line Items]        
Percent of deferred loan balances to be recovered 50.00%      
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 | More Stressful Environment        
Schedule of Expected Losses to be Paid [Line Items]        
Projected loss assumptions, CDR, plateau rate, projection period 42 months      
Period from plateau to intermediate conditional default rate (in months) 16 months      
Stress period (in months) 58 months      
Increase in conditional default rate ramp down period 4 months      
United States | RMBS | Second Lien | More Stressful Environment | Home Equity Line of Credit        
Schedule of Expected Losses to be Paid [Line Items]        
Change in estimate for increased conditional default rate plateau period $ (65)      
United States | RMBS | Second Lien | Least Stressful Environment        
Schedule of Expected Losses to be Paid [Line Items]        
Stress period (in months) 38 months      
Period of constant conditional default rate (in months) 30 months      
Decreased conditional default rate ramp down period 8 months      
Change in estimate for decreased prepayment rate, Percent 10.00%      
United States | RMBS | Second Lien | Least Stressful Environment | 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 $ 66      
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 | Home Equity Line of Credit Insured        
Schedule of Expected Losses to be Paid [Line Items]        
Initial period for which borrower can pay only interest payments 15 years      
United States | BIG | Public finance        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding $ 3,804   $ 3,796  
United States | BIG | RMBS        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 988   1,010  
Puerto Rico        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding 1,351   1,361  
Puerto Rico | BIG        
Schedule of Expected Losses to be Paid [Line Items]        
Net par outstanding $ 1,400   $ 1,400  
Minimum        
Schedule of Expected Losses to be Paid [Line Items]        
Risk free discount rate 3.44%   3.82%  
Maximum        
Schedule of Expected Losses to be Paid [Line Items]        
Risk free discount rate 4.87%   4.69%