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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 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 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 $ 433 $ 517 $ 505 $ 522 $ 522
Accretion of discount 4 4 9 9  
Changes in discount rates 1 (6) (2) 4  
Changes in timing and assumptions 16 51 7 47  
Total economic loss development (benefit) 21 49 14 60  
Net (paid) recovered losses (7) (6) (72) (22)  
Net expected loss to be paid (recovered), end of period 447 560 $ 447 560 $ 505
Weighted average risk free discount rate     4.55%   4.10%
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 398 393 $ 418 412 $ 412
Total economic loss development (benefit) 29 54 26 59  
Net (paid) recovered losses (16) (4) (33) (28)  
Net expected loss to be paid (recovered), end of period 411 443 411 443 418
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 37 42 44 44 44
Total economic loss development (benefit) 2 4 1 5  
Net (paid) recovered losses (3) (2) (9) (5)  
Net expected loss to be paid (recovered), end of period 36 44 36 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 35 124 87 110 110
Total economic loss development (benefit) (8) (5) (12) 1  
Net (paid) recovered losses 9 (2) (39) 6  
Net expected loss to be paid (recovered), end of period 36 117 $ 36 117 $ 87
Minimum          
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]          
Risk free discount rate     4.28%   3.79%
Maximum          
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]          
Risk free discount rate     5.33%   5.40%
United States          
Present Value of Net Expected Loss and Loss Adjustment Expenses to be Paid [Roll Forward]          
Net expected loss to be paid after recoveries for representations and warranties, percent     91.80%   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 378 380 $ 398 403 $ 403
Total economic loss development (benefit) 12 57 9 58  
Net (paid) recovered losses (16) (4) (33) (28)  
Net expected loss to be paid (recovered), end of period 374 433 374 433 398
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 (2) 82 43 66 66
Total economic loss development (benefit) (10) (9) (13) (4)  
Net (paid) recovered losses 12 0 (30) 11  
Net expected loss to be paid (recovered), end of period 0 73 0 73 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 20 13 20 9 9
Total economic loss development (benefit) 17 (3) 17 1  
Net (paid) recovered losses 0 0 0 0  
Net expected loss to be paid (recovered), end of period $ 37 $ 10 $ 37 $ 10 $ 20