Derivatives - Not Designated (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivatives not designated as hedging instruments
Gain (Loss) on Derivative Recognized in income	$ (64)	$ 16	$ (155)	$ 34
Foreign currency forward/option contracts | Cost of sales
Derivatives not designated as hedging instruments
Gain (Loss) on Derivative Recognized in income	3	(1)	8	(7)
Foreign currency forward contracts
Derivatives not designated as hedging instruments
Increase (decrease) from previously presented gain recognized in income due to revision		(4)		(22)
Foreign currency forward contracts | Interest expense
Derivatives not designated as hedging instruments
Gain (Loss) on Derivative Recognized in income	$ (67)	$ 17	$ (163)	$ 41