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Expected Loss to be Paid (Recovered) - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2023
Mar. 31, 2023
Jun. 30, 2023
Dec. 31, 2023
USD ($)
scenario
Payment
Curve
Dec. 31, 2022
USD ($)
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    
Loss and LAE reserve paid       $ 25 $ 33 $ 36
Expected LAE to be paid       $ 22 $ 11  
Projected loss assumptions, number of scenarios considered | scenario       5 5  
Recovery period       5 years    
First Lien            
Schedule of Expected Losses to be Paid [Line Items]            
Effect of recovery       $ 7    
Second Lien            
Schedule of Expected Losses to be Paid [Line Items]            
Effect of recovery       $ 31    
U.S. | 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    
Final conditional prepayment rates, term         12 months  
Deferred loan balances to be recovered, percent       30.00%    
Intermediate conditional default rate (as a percent)       5.00%    
U.S. | RMBS | First Lien | More Stressful Environment            
Schedule of Expected Losses to be Paid [Line Items]            
Deferred loan balances to be recovered, percent   10.00%        
U.S. | RMBS | First Lien | Least Stressful Environment            
Schedule of Expected Losses to be Paid [Line Items]            
Deferred loan balances to be recovered, percent   50.00%        
U.S. | RMBS | First Lien | Base Scenario            
Schedule of Expected Losses to be Paid [Line Items]            
Deferred loan balances to be recovered, percent 30.00% 20.00% 20.00%      
U.S. | 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 to reach intermediate conditional default rate       12 months    
Final conditional default rate as a percentage of plateau conditional default rate       5.00%    
Projected loss assumptions, Final CDR, Period for voluntary prepayments to continue       1 year    
Period for which estimated defaults are attributed to loans currently delinquent or in foreclosure       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    
U.S. | RMBS | First Lien | More Stressful Environment            
Schedule of Expected Losses to be Paid [Line Items]            
Period to reach intermediate conditional default rate       16 months    
Projected loss assumptions, period to reach final loss severity rate       9 years    
Deferred loan balances to be recovered, percent       10.00%    
Projected loss assumptions, increase (decrease) in expected loss to be paid, net       $ 30    
U.S. | 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 to reach intermediate conditional default rate       8 months    
Deferred loan balances to be recovered, percent       50.00%    
Projected loss assumptions, increase (decrease) in expected loss to be paid, net       $ 22    
Decrease in the plateau period used to calculate potential change in loss estimate (in months)       6 months    
U.S. | RMBS | Second Lien            
Schedule of Expected Losses to be Paid [Line Items]            
Period of conditional default rate downward trend       1 year    
Percent of original period of consistent conditional default rate       5.00%    
Loss recovery assumption       2.00% 2.00%  
Liquidation rate 30.00%     40.00%    
Conditional prepayment rate, final rate       15.00%    
Number of conditional default rate curves modeled in estimating losses | Curve       5    
U.S. | RMBS | Second Lien | More Stressful Environment            
Schedule of Expected Losses to be Paid [Line Items]            
Deferred loan balances to be recovered, percent       10.00%    
U.S. | RMBS | Second Lien | Least Stressful Environment            
Schedule of Expected Losses to be Paid [Line Items]            
Deferred loan balances to be recovered, percent       80.00%    
U.S. | RMBS | Second Lien | Base Scenario            
Schedule of Expected Losses to be Paid [Line Items]            
Current conditional prepayment rate used in alternate scenario for loss estimate (as a percent)         15.00%  
U.S. | 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 to reach intermediate conditional default rate       16 months    
Increase in conditional default rate ramp down period       4 months    
Stress period (in months)       58 months    
U.S. | 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       $ 87    
U.S. | 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    
Ultimate prepayment rate       10.00%    
U.S. | 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       $ 118    
U.S. | 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    
U.S. | 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