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Expected Loss to be Paid (Recovered) - Additional Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
scenario
Payment
Curve
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
scenario
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
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)     2.90%   1.02%      
Net Expected Loss to be Paid (Recovered) $ 442 $ 466 $ 442 $ 466 $ 411 $ 432 $ 472 $ 529
Loss and LAE Reserve paid 7 6 20 10        
Expected LAE to be paid 14   14   26      
Ceded expected loss to be recovered (paid) (3)   (3)   10      
Net par outstanding 232,812   232,812   236,392      
Net economic loss development (benefit) $ (32) (20) $ (76) (7)        
Additional loss recovery assumption, recovery period     5 years          
Loss recovery assumption, additional increase in recovery projection, percent 40.00%   40.00%          
Loss recovery assumption, additional increase in recovery projection, economic benefit $ 40   $ 40          
Loss recovery assumption, additional decrease in recovery projection, percent 20.00%   20.00%          
Loss recovery assumption, additional decrease in recovery projection, economic loss $ 40   $ 40          
Public Finance Stockton Pension Obligation Bonds                
Schedule of Expected Losses to be Paid [Line Items]                
Net par outstanding 100   100          
Public finance                
Schedule of Expected Losses to be Paid [Line Items]                
Net Expected Loss to be Paid (Recovered) 217 243 217 243 209 191 252 341
Net par outstanding 224,095   224,095   227,164      
Net economic loss development (benefit) 6 0 (44) 3        
Other structured finance                
Schedule of Expected Losses to be Paid [Line Items]                
Net Expected Loss to be Paid (Recovered) 46 45 46 45 52 46 39 40
Net par outstanding 6,546   6,546   6,837      
Net economic loss development (benefit) 1 8 0 7        
BIG                
Schedule of Expected Losses to be Paid [Line Items]                
Net par outstanding 5,386   5,386   7,356      
BIG | Public finance                
Schedule of Expected Losses to be Paid [Line Items]                
Net par outstanding 4,091   4,091   5,972      
BIG | Other structured finance                
Schedule of Expected Losses to be Paid [Line Items]                
Net par outstanding 110   110   $ 119      
BIG | Student Loan                
Schedule of Expected Losses to be Paid [Line Items]                
Net par outstanding 51   51          
BIG | Life insurance transactions                
Schedule of Expected Losses to be Paid [Line Items]                
Net par outstanding 40   $ 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     98.60%   97.20%      
United States | Public finance                
Schedule of Expected Losses to be Paid [Line Items]                
Net Expected Loss to be Paid (Recovered) 210 221 $ 210 221 $ 197 181 228 305
Net par outstanding 179,648   179,648   177,219      
Net economic loss development (benefit) 8 1 (40) 16        
United States | RMBS                
Schedule of Expected Losses to be Paid [Line Items]                
Net Expected Loss to be Paid (Recovered) 179 178 179 178 150 $ 195 $ 181 $ 148
Net par outstanding 2,171   2,171   2,391      
Net economic loss development (benefit) $ (39) (28) $ (32) (17)        
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%   1.00%          
United States | RMBS | First Lien                
Schedule of Expected Losses to be Paid [Line Items]                
Net Expected Loss to be Paid (Recovered) $ 195   $ 195   $ 167      
Net economic loss development (benefit) $ (14) (14) $ 4 11        
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%   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          
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%   40.00%          
Projected loss assumptions, period to reach final loss severity rate     2 years 6 months          
Final CPR 15.00%   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     $ (15)          
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     $ 11          
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) $ (16)   $ (16)   $ (17)      
Net economic loss development (benefit) $ (25) $ (14) $ (36) $ (28)        
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%   2.00%      
Number of conditional default rate curves modeled in estimating losses | Curve     5          
Liquidation rate 30.00%   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%   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     $ 5          
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 $ 3,570   $ 3,570   $ 5,372      
United States | BIG | RMBS                
Schedule of Expected Losses to be Paid [Line Items]                
Net par outstanding 1,185   1,185   1,265      
Puerto Rico                
Schedule of Expected Losses to be Paid [Line Items]                
Net par outstanding 2,227   2,227   3,572      
Puerto Rico | BIG                
Schedule of Expected Losses to be Paid [Line Items]                
Net par outstanding 2,227   2,227   3,572      
Non United States | Public finance                
Schedule of Expected Losses to be Paid [Line Items]                
Net Expected Loss to be Paid (Recovered) 7   7   $ 12      
Net economic loss development (benefit) $ (2)   $ (4)          
Minimum                
Schedule of Expected Losses to be Paid [Line Items]                
Risk free discount rate     1.67%   0.00%      
Maximum                
Schedule of Expected Losses to be Paid [Line Items]                
Risk free discount rate     3.41%   1.98%