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Financial Instruments, Derivatives and Hedging Activities - Gain (Losses) Recognized in Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Hedging relationships      
Loss expected to be reclassified into earnings during the next twelve months, net of tax $ (7)    
Loss expected to be reclassified into earnings during the next twelve months, income tax effect 2    
Fair Value Hedging | Interest Rate Contracts | Financing costs, net      
Hedging relationships      
Gains (losses) recognized in income, Hedging instruments 2 $ (2) $ (2)
Gains (losses) recognized in income, Hedged item $ (2) $ 2 $ 2