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Contracts Accounted for as Credit Derivatives - Credit Derivatives Subordination and Ratings (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 01, 2018
Dec. 31, 2016
Net Par Outstanding on Credit Derivatives        
Net Par Outstanding $ 6,182 $ 6,207    
Fair value of credit derivative asset (liability), net (207) (269)    
Expected Loss to be recovered (2) (14)    
Net Expected Loss to be Paid (Recovered) $ 1,183 $ 1,303   $ 1,198
Estimated remaining weighted average life of credit derivatives (in years) 11 years 7 months 2 days 11 years 8 months    
Pooled corporate obligations [Member] | TruPS CDOs [Member]        
Net Par Outstanding on Credit Derivatives        
Net Par Outstanding $ 642 $ 878    
Fair value of credit derivative asset (liability), net (28) (72)    
Residential Mortgage-Backed Securities (RMBS) [Member] | United States [Member]        
Net Par Outstanding on Credit Derivatives        
Net Par Outstanding 641 916    
Fair value of credit derivative asset (liability), net (31) (53)    
Net Expected Loss to be Paid (Recovered) 293 73   $ 206
Pooled infrastructure [Member]        
Net Par Outstanding on Credit Derivatives        
Net Par Outstanding 1,373 1,561    
Pooled infrastructure [Member] | United States [Member]        
Net Par Outstanding on Credit Derivatives        
Fair value of credit derivative asset (liability), net (34) (42)    
Infrastructure finance [Member]        
Net Par Outstanding on Credit Derivatives        
Net Par Outstanding 1,300 572    
Infrastructure finance [Member] | United States [Member]        
Net Par Outstanding on Credit Derivatives        
Fair value of credit derivative asset (liability), net (63) (36)    
Regulated utilities [Member] | TruPS CDOs [Member]        
Net Par Outstanding on Credit Derivatives        
Net Par Outstanding 1,096 548    
Fair value of credit derivative asset (liability), net (11) (10)    
Other [Member]        
Net Par Outstanding on Credit Derivatives        
Net Par Outstanding 1,130 1,732    
Fair value of credit derivative asset (liability), net $ (40) $ (56)    
Reinsurance of SGI Insured Portfolio [Member] | Syncora Guarantee Inc [Member] | United States [Member]        
Net Par Outstanding on Credit Derivatives        
Net Par Outstanding     $ 1,500  
Fair value of credit derivative asset (liability), net     68  
Net Expected Loss to be Paid (Recovered)     $ 0