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Expected Loss to be Paid (Recovered) - Narrative (Details)
$ in Millions
 12 Months Ended
Jun. 26, 2023
USD ($)
Dec. 31, 2024
USD ($)
Payment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2024
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   $ 30 $ 25 $ 33  
Expected LAE to be paid   11 22    
Public finance estimated future recoveries of claims paid   262 193    
Net Par Outstanding   261,552 249,153    
Net   $ 415,966 397,636    
Recovery period   5 years      
PREPA | Guarantee Obligations          
Schedule of Expected Losses to be Paid [Line Items]          
Damages sought, estimate $ 2,400        
Damages sought, value $ 8,500        
First Lien          
Schedule of Expected Losses to be Paid [Line Items]          
Effect of recovery   $ 15      
U.S.          
Schedule of Expected Losses to be Paid [Line Items]          
Net Par Outstanding   209,628      
U.S. | RMBS          
Schedule of Expected Losses to be Paid [Line Items]          
Net Par Outstanding   $ 1,507 $ 1,774    
U.S. | RMBS | First Lien          
Schedule of Expected Losses to be Paid [Line Items]          
Projected loss assumptions, CDR, plateau rate, projection period   36 months      
Number of delinquent payments | Payment   2      
U.S. | RMBS | First Lien | Base Scenario          
Schedule of Expected Losses to be Paid [Line Items]          
Future recovery for deferred principal balances   50.00% 30.00%    
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      
Projected loss assumptions, Final CDR, Period for voluntary prepayments to continue   1 year      
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]          
Future recovery for deferred principal balances   20.00%      
Projected loss assumptions, period to reach final loss severity rate   9 years      
Period to reach intermediate conditional default rate   16 months      
Projected loss assumptions, increase (decrease) in expected loss to be paid, net   $ 31      
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      
Future recovery for deferred principal balances   80.00%      
Period to reach intermediate conditional default rate   8 months      
Projected loss assumptions, increase (decrease) in expected loss to be paid, net   $ 28      
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]          
Loss recovery assumption   2.00% 2.00%    
Liquidation rate   40.00%     50.00%
Charge-off loan balances to be recovered, benefit   $ 29      
Period of conditional default rate downward trend   1 year      
Percent of original period of consistent conditional default rate   5.00%      
U.S. | RMBS | Second Lien | More Stressful Environment          
Schedule of Expected Losses to be Paid [Line Items]          
Future recovery for deferred principal balances   20.00%      
U.S. | RMBS | Second Lien | Least Stressful Environment          
Schedule of Expected Losses to be Paid [Line Items]          
Future recovery for deferred principal balances   80.00%      
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      
Ultimate prepayment rate   15.00%      
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   $ 78      
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   $ 78      
Non U.S.          
Schedule of Expected Losses to be Paid [Line Items]          
Net Par Outstanding   51,924      
Puerto Rico          
Schedule of Expected Losses to be Paid [Line Items]          
Net Par Outstanding   637 $ 1,105    
Net   756 1,508    
Puerto Rico | Puerto Rico Defaulted Exposures Subject to a Plan Support Agreement | PREPA          
Schedule of Expected Losses to be Paid [Line Items]          
Net Par Outstanding   532 624    
Net   629 751    
Puerto Rico | Other Puerto Rico Exposures          
Schedule of Expected Losses to be Paid [Line Items]          
Net Par Outstanding   $ 92 $ 109