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Financial Instruments - Income Statement Effects on Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Foreign currency | Other (income) expense, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Derivative Pretax (Gain) Loss Recognized in Income $ 118 $ 28
Forecasted transactions | Sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Derivative Pretax (Gain) Loss Recognized in Income $ 10 $ 8