Property, Plants, and Equipment, Net - Summary of Properties, Plants, and Equipment (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation and amortization	$ 6,721	$ 6,392
Properties, plants, and equipment, net	5,628	5,594
Land and land rights
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	142	140
Structures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,413	2,395
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,222	8,830
Construction in Progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	572	621
Depreciable Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,777	11,365
Properties, plants, and equipment, net	$ 5,056	$ 4,973