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Contracts Accounted for as Credit Derivatives - CDS Spread and Components of Credit Derivative Assets (Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Credit Derivatives        
Fair value of credit derivatives before effect of AGC and AGM credit spreads $ (370) $ (407)    
Plus: Effect of AGC and AGM credit spreads 142 200    
Net fair value of credit derivatives $ (228) $ (207)    
Credit Risk Contract, 5 Year Spread [Member] | AGC [Member]        
Credit Derivatives        
Quoted price of CDS contract (as a percent) 0.74% 1.10% 1.21% 1.63%
Credit Risk Contract, 5 Year Spread [Member] | AGM [Member]        
Credit Derivatives        
Quoted price of CDS contract (as a percent) 0.72% 1.16% 1.09% 1.45%
Credit Risk Contract, 1 Year Spread [Member] | AGC [Member]        
Credit Derivatives        
Quoted price of CDS contract (as a percent) 0.20% 0.22% 0.25% 0.70%
Credit Risk Contract, 1 Year Spread [Member] | AGM [Member]        
Credit Derivatives        
Quoted price of CDS contract (as a percent) 0.13% 0.24% 0.22% 0.28%