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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
Mar. 31, 2023
Mar. 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 $ 522 $ 411
Accretion of discount 5 2
Changes in discount rates 10 (47)
Changes in timing and assumptions (4) 1
Total economic loss development (benefit) 11 (44)
Net (paid) recovered losses (16) 65
Net expected loss to be paid (recovered), end of period $ 517 $ 432
Period after the end of the reporting period within which the ceded paid losses are typically settled (in days) 45 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 $ 412 $ 209
Total economic loss development (benefit) 5 (50)
Net (paid) recovered losses (24) 32
Net expected loss to be paid (recovered), end of period 393 191
Public finance | United States    
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 403 197
Total economic loss development (benefit) 1 (48)
Net (paid) recovered losses (24) 32
Net expected loss to be paid (recovered), end of period 380 181
Public finance | 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 9 12
Total economic loss development (benefit) 4 (2)
Net (paid) recovered losses 0 0
Net expected loss to be paid (recovered), end of period 13 10
RMBS | United States    
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 66 150
Total economic loss development (benefit) 5 7
Net (paid) recovered losses 11 38
Net expected loss to be paid (recovered), end of period 82 195
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 52
Total economic loss development (benefit) 1 (1)
Net (paid) recovered losses (3) (5)
Net expected loss to be paid (recovered), end of period 42 46
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 110 202
Total economic loss development (benefit) 6 6
Net (paid) recovered losses 8 33
Net expected loss to be paid (recovered), end of period $ 124 $ 241