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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 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
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 $ 447 $ 560 $ 505 $ 522 $ 522
Accretion of discount 5 6 14 15  
Changes in discount rates 3 (12) 1 (8)  
Changes in timing and assumptions (42) 93 (35) 140  
Total economic loss development (benefit) (34) 87 (20) 147  
Net (paid) recovered losses (107) (157) (179) (179)  
Net expected loss to be paid (recovered), end of period 306 490 $ 306 490 505
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 411 443 $ 418 412 412
Total economic loss development (benefit) 23 134 49 193  
Net (paid) recovered losses (115) (169) (148) (197)  
Net expected loss to be paid (recovered), end of period 319 408 319 408 418
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 36 44 44 44 44
Total economic loss development (benefit) (1) 1 0 6  
Net (paid) recovered losses (2) (1) (11) (6)  
Net expected loss to be paid (recovered), end of period 33 44 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 36 117 87 110 110
Total economic loss development (benefit) (57) (47) (69) (46)  
Net (paid) recovered losses 8 12 (31) 18  
Net expected loss to be paid (recovered), end of period (13) 82 $ (13) 82 $ 87
United States          
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]          
Weighted average risk free discount rate     3.74%   4.10%
Net expected loss to be paid after recoveries for representations and warranties, percent     71.70%   96.10%
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 374 433 $ 398 403 $ 403
Total economic loss development (benefit) (23) 135 (14) 193  
Net (paid) recovered losses (113) (169) (146) (197)  
Net expected loss to be paid (recovered), end of period 238 399 238 399 398
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 0 73 43 66 66
Total economic loss development (benefit) (56) (48) (69) (52)  
Net (paid) recovered losses 10 13 (20) 24  
Net expected loss to be paid (recovered), end of period (46) 38 $ (46) 38 $ 43
United States | Minimum          
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]          
Risk free discount rate     3.52%   3.79%
United States | Maximum          
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]          
Risk free discount rate     4.96%   5.40%
Non-U.S. public finance          
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]          
Weighted average risk free discount rate     3.94%   3.28%
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 37 10 $ 20 9 $ 9
Total economic loss development (benefit) 46 (1) 63 0  
Net (paid) recovered losses (2) 0 (2) 0  
Net expected loss to be paid (recovered), end of period $ 81 $ 9 $ 81 $ 9 $ 20
Non-U.S. public finance | Minimum          
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]          
Risk free discount rate     1.86%   1.90%
Non-U.S. public finance | Maximum          
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]          
Risk free discount rate     4.95%   5.21%