Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Property, plant and equipment
Property, plant and equipment, gross	$ 7,044		$ 7,277
Accumulated depreciation	(2,684)		(2,735)
Net property, plant and equipment	4,360		4,542
Depreciation expense	122	$ 125
Land
Property, plant and equipment
Property, plant and equipment, gross	159		159
Buildings
Property, plant and equipment
Property, plant and equipment, gross	1,306		1,359
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, gross	5,069		5,250
Construction-in-progress
Property, plant and equipment
Property, plant and equipment, gross	$ 510		$ 509

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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