Property, Plant and Equipment, Net

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment, Net [Abstract]

Property, Plant and Equipment, Net

Property, Plant and Equipment, Net

	As of December 31,
	2019		2018
	(In $ millions)
Land	46		46
Land improvements	78		77
Buildings and building improvements	775		760
Machinery and equipment	5,316		5,223
Construction in progress	455		416
Gross asset value	6,670		6,522
Accumulated depreciation	(2,957	)	(2,803	)
Net book value	3,713		3,719

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

	As of December 31,
	2019		2018
	(In $ millions)
Buildings	13		14
Machinery and equipment	272		279
Accumulated depreciation	(202	)	(188	)
Net book value	83		105

Capitalized interest costs and depreciation expense are as follows:

	Year Ended December 31,
	2019	2018	2017
	(In $ millions)
Capitalized interest	8	10	6
Depreciation expense	327	319	285

During 2019 and 2017, certain long-lived assets were impaired (Note 18). No long-lived assets were impaired during 2018.