Derivatives - Not Designated (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivatives not designated as hedging instruments
Gain (Loss) on Derivative Recognized in income	$ 20	$ 41
Foreign currency forward/option contracts | Cost of sales
Derivatives not designated as hedging instruments
Gain (Loss) on Derivative Recognized in income	(3)	(1)
Foreign currency forward contracts | Interest expense.
Derivatives not designated as hedging instruments
Gain (Loss) on Derivative Recognized in income	$ 23	$ 42