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Financial Instruments, Derivatives and Hedging Activities - Additional information - FV hedges (Details) - Fair Value Hedging - Long-term debt - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Additional information pertaining to fair value hedges    
Carrying Amount of the Hedged Liabilities $ (201) $ (199)
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Liabilities $ (1)  
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Assets   $ 1