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Property, Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment, Net [Abstract]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
As of December 31,
20202019
(In $ millions)
Land53 46 
Land improvements79 78 
Buildings and building improvements826 775 
Machinery and equipment5,768 5,316 
Construction in progress492 455 
Gross asset value7,218 6,670 
Accumulated depreciation(3,279)(2,957)
Net book value3,939 3,713 
Assets under finance leases, net, included in the amounts above are as follows:
As of December 31,
20202019
(In $ millions)
Buildings14 13 
Machinery and equipment365 272 
Accumulated depreciation(231)(202)
Net book value148 83 
Capitalized interest costs and depreciation expense are as follows:
Year Ended December 31,
202020192018
(In $ millions)
Capitalized interest8 8 10 
Depreciation expense327 327 319 
During 2020 and 2019, certain long-lived assets were impaired (Note 16). No long-lived assets were impaired during 2018.