Property, Plant and Equipment, Net

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment, Net [Abstract]

Property, Plant and Equipment, Net

Property, Plant and Equipment, Net

	As of December 31,
	2018		2017
	(In $ millions)
Land	46		47
Land improvements	77		72
Buildings and building improvements	760		758
Machinery and equipment	5,223		5,101
Construction in progress	416		368
Gross asset value	6,522		6,346
Accumulated depreciation	(2,803	)	(2,584	)
Net book value	3,719		3,762

Assets under capital leases, net, included in the amounts above are as follows:

	As of December 31,
	2018		2017
	(In $ millions)
Buildings	14		14
Machinery and equipment	279		296
Accumulated depreciation	(188	)	(179	)
Net book value	105		131

Capitalized interest costs and depreciation expense are as follows:

	Year Ended December 31,
	2018	2017	2016
	(In $ millions)
Capitalized interest	10	6	5
Depreciation expense	319	285	281

No long-lived assets were impaired during 2018. During 2017 and 2016, certain long-lived assets were impaired (Note 18).