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Expected Loss to be Paid (Recovered) - Net Expected Loss to be Paid After Net Expected Recoveries for Breaches of R&W Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]      
Net expected loss to be paid (recovered), beginning of period $ 106 $ 505 $ 505
Accretion of discount 1 5  
Changes in discount rates 5 (3)  
Changes in timing and assumptions (21) (9)  
Total economic loss development (benefit) (15) (7)  
Net (paid) recovered losses 59 (65)  
Net expected loss to be paid (recovered), end of period $ 150 433 106
Period after the end of the reporting period within which the ceded paid losses are typically settled (in days) 45 days    
Public finance      
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]      
Net expected loss to be paid (recovered), beginning of period $ 116 418 418
Total economic loss development (benefit) 53 (3)  
Net (paid) recovered losses (12) (17)  
Net expected loss to be paid (recovered), end of period 157 398 116
Other structured finance      
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]      
Net expected loss to be paid (recovered), beginning of period 33 44 44
Total economic loss development (benefit) (65) (1)  
Net (paid) recovered losses 62 (6)  
Net expected loss to be paid (recovered), end of period 30 37 33
Structured finance      
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]      
Net expected loss to be paid (recovered), beginning of period (10) 87 87
Total economic loss development (benefit) (68) (4)  
Net (paid) recovered losses 71 (48)  
Net expected loss to be paid (recovered), end of period $ (7) 35 $ (10)
Minimum      
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]      
Risk free discount rate 1.99%   1.98%
Maximum      
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]      
Risk free discount rate 5.41%   5.22%
Weighted Average      
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]      
Risk free discount rate 4.18%   4.38%
United States | Public finance      
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]      
Net expected loss to be paid (recovered), beginning of period $ 18 398 $ 398
Total economic loss development (benefit) 29 (3)  
Net (paid) recovered losses (12) (17)  
Net expected loss to be paid (recovered), end of period 35 378 18
United States | RMBS      
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]      
Net expected loss to be paid (recovered), beginning of period (43) 43 43
Total economic loss development (benefit) (3) (3)  
Net (paid) recovered losses 9 (42)  
Net expected loss to be paid (recovered), end of period (37) (2) (43)
Non-U.S. public finance | Public finance      
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]      
Net expected loss to be paid (recovered), beginning of period 98 20 20
Total economic loss development (benefit) 24 0  
Net (paid) recovered losses 0 0  
Net expected loss to be paid (recovered), end of period $ 122 $ 20 $ 98