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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, 2022
Mar. 31, 2021
Dec. 31, 2021
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  
Accretion of discount 2 1  
Changes in discount rates (47) (48)  
Changes in timing and assumptions 1 60  
Total economic loss development (benefit) (44) 13  
Net (paid) recovered losses 65 (70)  
Net expected loss to be paid (recovered), end of period $ 432 472  
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 $ 13 4  
Expected LAE to be paid 17   $ 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  
Total economic loss development (benefit) (50) 3  
Net (paid) recovered losses 32 (92)  
Net expected loss to be paid (recovered), end of period 191 252  
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 197 305  
Total economic loss development (benefit) (48) 15  
Net (paid) recovered losses 32 (92)  
Net expected loss to be paid (recovered), end of period 181 228  
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 12 36  
Total economic loss development (benefit) (2) (12)  
Net (paid) recovered losses 0 0  
Net expected loss to be paid (recovered), end of period 10 24  
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 150 148  
Total economic loss development (benefit) 7 11  
Net (paid) recovered losses 38 22  
Net expected loss to be paid (recovered), end of period 195 181  
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  
Total economic loss development (benefit) (1) (1)  
Net (paid) recovered losses (5) 0  
Net expected loss to be paid (recovered), end of period 46 39  
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  
Total economic loss development (benefit) 6 10  
Net (paid) recovered losses 33 22  
Net expected loss to be paid (recovered), end of period $ 241 $ 220