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Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
The following table summarizes our property, plant and equipment at September 30, 2020 and December 31, 2019:
Millions of dollarsSeptember 30, 2020December 31, 2019
Land$91 $97 
Buildings1,540 1,540 
Machinery and equipment8,186 8,108 
Accumulated depreciation(6,681)(6,444)
Property, plant and equipment, net$3,136 $3,301