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Contracts Accounted for as Credit Derivatives - CDS Spread and Components of Credit Derivative Assets (Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Credit Derivatives            
Fair value of credit derivatives before effect of AGC and AGM credit spreads $ (382)   $ (555)      
Plus: Effect of AGC and AGM credit spreads 145   286      
Net fair value of credit derivatives $ (237)   $ (269)      
Credit Risk Contract, 5 Year Spread [Member] | AGC [Member]            
Credit Derivatives            
Quoted price of CDS contract (as a percent) 0.77% 1.05% 1.63% 1.90% 1.36% 1.58%
Credit Risk Contract, 5 Year Spread [Member] | AGM [Member]            
Credit Derivatives            
Quoted price of CDS contract (as a percent) 0.81% 1.06% 1.45% 1.90% 1.40% 1.58%
Credit Risk Contract, 1 Year Spread [Member] | AGC [Member]            
Credit Derivatives            
Quoted price of CDS contract (as a percent) 0.15% 0.22% 0.70% 0.81% 0.15% 0.35%
Credit Risk Contract, 1 Year Spread [Member] | AGM [Member]            
Credit Derivatives            
Quoted price of CDS contract (as a percent) 0.17% 0.21% 0.28% 0.81% 0.15% 0.29%