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Expected Loss to be Paid (Recovered) - Net Expected Loss to be Paid (Recovered) Roll Forward by Sector (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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 $ 529 $ 737
Economic Loss Development (Benefit) (125) (287) 145
Net (paid) recovered losses 236 169 (353)
Net expected loss to be paid (recovered), end of period $ 522 411 529
Period after the end of the reporting period within which the ceded paid losses are typically settled (in days) 45 days    
Loss and LAE reserve paid $ 33 36 25
Expected LAE to be paid 11 26  
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 209 341 554
Economic Loss Development (Benefit) 17 (204) 203
Net (paid) recovered losses 186 72 (416)
Net expected loss to be paid (recovered), end of period 412 209 341
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 52 40 37
Economic Loss Development (Benefit) 1 17 13
Net (paid) recovered losses (9) (5) (10)
Net expected loss to be paid (recovered), end of period 44 52 40
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 202 188 183
Economic Loss Development (Benefit) (142) (83) (58)
Net (paid) recovered losses 50 97 63
Net expected loss to be paid (recovered), end of period 110 202 188
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 197 305 531
Economic Loss Development (Benefit) 19 (182) 190
Net (paid) recovered losses 187 74 (416)
Net expected loss to be paid (recovered), end of period 403 197 305
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 150 148 146
Economic Loss Development (Benefit) (143) (100) (71)
Net (paid) recovered losses 59 102 73
Net expected loss to be paid (recovered), end of period 66 150 148
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 12 36 23
Economic Loss Development (Benefit) (2) (22) 13
Net (paid) recovered losses (1) (2) 0
Net expected loss to be paid (recovered), end of period $ 9 $ 12 $ 36