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Financial Instruments - Income Statement Effects on Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Foreign currency | Other (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Derivative Pretax (Gain) Loss Recognized in Income $ 2 $ (195) $ 120 $ (167)
Forecasted transactions | Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Derivative Pretax (Gain) Loss Recognized in Income $ (6) $ (14) $ 4 $ (5)