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Contracts Accounted for as Credit Derivatives - Credit Derivatives Net Par Outstanding by Sector (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Credit Derivatives    
Estimated remaining weighted average life of credit derivatives (in years) 11 years 6 months 11 years 7 months 6 days
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding $ 5,956 $ 6,182
Fair value of credit derivative asset (liability), net (185) (207)
Expected Loss to be recovered (4) (2)
Public Finance [Member] | United States [Member]    
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding 1,942 1,783
Fair value of credit derivative asset (liability), net (83) (65)
Public Finance [Member] | Non United States [Member]    
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding 2,676 2,807
Fair value of credit derivative asset (liability), net (39) (51)
Structured Finance [Member] | United States [Member]    
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding 1,206 1,465
Fair value of credit derivative asset (liability), net (58) (85)
Structured Finance [Member] | Non United States [Member]    
Net Par Outstanding on Credit Derivatives    
Net Par Outstanding 132 127
Fair value of credit derivative asset (liability), net $ (5) $ (6)