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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, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Payment
scenario
Curve
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
scenario
Schedule of Expected Losses to be Paid [Line Items]          
Period of insured credit performance of guaranteed obligations (in some cases over)     30 years    
Loss and LAE Reserve paid $ 13 $ 5 $ 20 $ 8  
Expected LAE to be paid 11   11   $ 22
Credit for estimated future recoveries of claims paid $ 197   $ 197   $ 193
Additional loss recovery assumption, recovery period     5 years    
United States | RMBS | First Lien          
Schedule of Expected Losses to be Paid [Line Items]          
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%   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]          
Percent of deferred loan balances to be recovered     30.00%    
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%   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)     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     $ 26    
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     $ (19)    
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]          
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%   2.00%
Liquidation rate 40.00%   40.00%    
Number of conditional default rate curves modeled in estimating losses | Curve     5    
United States | RMBS | Second Lien | More Stressful Environment          
Schedule of Expected Losses to be Paid [Line Items]          
Percent of deferred loan balances to be recovered     10.00%    
United States | RMBS | Second Lien | Least Stressful Environment          
Schedule of Expected Losses to be Paid [Line Items]          
Percent of deferred loan balances to be recovered     80.00%    
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 | 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    
Increase in conditional default rate ramp down period     4 months    
Stress period (in months)     58 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     $ 83    
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     $ 111    
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