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Financial Instruments, Derivatives and Hedging Activities - Gain (Losses) Recognized in Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Hedging relationships        
Loss expected to be reclassified into earnings during the next twelve months, net of tax     $ (36)  
Loss expected to be reclassified into earnings during the next twelve months, income tax effect     13  
Fair Value Hedging | Interest Rate Contracts | Financing costs, net        
Hedging relationships        
Gains (losses) recognized in income, Hedging instruments $ (4) $ 3 (1) $ 3
Gains (losses) recognized in income, Hedged item $ 4 $ (3) $ 1 $ (3)