Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Property, plant and equipment
Property, plant and equipment, gross	$ 7,609		$ 7,386
Accumulated depreciation	(2,882)		(2,776)
Net property, plant and equipment	4,727		4,610
Depreciation expense	125	$ 107
Noncash capital expenditures	97		124
Land
Property, plant and equipment
Property, plant and equipment, gross	174		172
Buildings
Property, plant and equipment
Property, plant and equipment, gross	1,391		1,390
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, gross	5,378		5,282
Construction-in-progress
Property, plant and equipment
Property, plant and equipment, gross	$ 666		$ 542