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Expected Loss to be Paid (Recovered) - Additional Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2024
Sep. 30, 2024
USD ($)
Curve
Payment
scenario
Sep. 30, 2023
USD ($)
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 $ 5 $ 9   $ 25 $ 17  
Expected LAE to be paid 16     16   $ 22
Credit for estimated future recoveries of claims paid $ 206     $ 206   $ 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 50.00%   30.00%     30.00%
Benefit from updated assumptions on expected losses $ 15          
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       20.00%    
Projected loss assumptions, increase (decrease) in expected loss to be paid, net       $ 33    
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       80.00%    
Projected loss assumptions, increase (decrease) in expected loss to be paid, net       $ (31)    
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]            
Benefit from updated assumptions on expected losses $ 29          
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%   50.00% 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       20.00%    
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       $ 81    
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       $ 82    
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