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Financial Instruments - Effects of Derivatives Not Designated as Hedging Instruments (Details) - Foreign exchange contracts - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other (income) expense, net      
Derivative [Line Items]      
Amount of Derivative Pretax (Gain) Loss Recognized in Income $ 260 $ (110) $ (132)
Sales      
Derivative [Line Items]      
Amount of Derivative Pretax (Gain) Loss Recognized in Income $ 8 $ 3 $ 0