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Financial Instruments, Derivatives and Hedging Activities - Gain (Losses) Recognized in Income (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Hedging relationships    
Loss expected to be reclassified into earnings during the next twelve months, net of tax $ (3)  
Loss expected to be reclassified into earnings during the next twelve months, income tax effect 1  
Fair Value Hedging | Interest Rate Contracts | Financing costs, net    
Hedging relationships    
Gains (losses) recognized in income, Hedging instruments (1) $ 3
Gains (losses) recognized in income, Hedged item $ 1 $ (3)