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Expected Loss to be Paid (Recovered) - Net Expected Loss to be Paid (Recovered) Roll Forward (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
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 $ 505 $ 522 $ 411
Accretion of discount 16 20 16
Changes in discount rates 4 3 (115)
Changes in timing and assumptions (23) 141 (26)
Total economic loss development (benefit) (3) 164 (125)
Net (paid) recovered losses (396) (181) 236
Net expected loss to be paid (recovered), end of period $ 106 $ 505 522
Weighted average risk free discount rate 4.38% 4.09%  
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 $ 418 $ 412 209
Total economic loss development (benefit) 72 212 17
Net (paid) recovered losses (374) (206) 186
Net expected loss to be paid (recovered), end of period 116 418 412
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 44 44 52
Total economic loss development (benefit) 0 8 1
Net (paid) recovered losses (11) (8) (9)
Net expected loss to be paid (recovered), end of period 33 44 44
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 87 110 202
Total economic loss development (benefit) (75) (48) (142)
Net (paid) recovered losses (22) 25 50
Net expected loss to be paid (recovered), end of period (10) 87 110
U.S. | 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 398 403 197
Total economic loss development (benefit) (9) 201 19
Net (paid) recovered losses (371) (206) 187
Net expected loss to be paid (recovered), end of period 18 398 403
U.S. | 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 66 150
Total economic loss development (benefit) (75) (56) (143)
Net (paid) recovered losses (11) 33 59
Net expected loss to be paid (recovered), end of period (43) 43 66
Non U.S. | 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 20 9 12
Total economic loss development (benefit) 81 11 (2)
Net (paid) recovered losses (3) 0 (1)
Net expected loss to be paid (recovered), end of period $ 98 $ 20 $ 9
Minimum      
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]      
Risk free discount rate 1.98% 1.90%  
Maximum      
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]      
Risk free discount rate 5.22% 5.40%