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Property, Plant & Equipment (Tables)
6 Months Ended
Jun. 30, 2020
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
The following table summarizes our property, plant and equipment at June 30, 2020 and December 31, 2019:
Millions of dollars

June 30, 2020

December 31, 2019
Land

$
89


$
97

Buildings

1,518


1,540

Machinery and equipment

8,022


8,108

Accumulated depreciation

(6,497
)

(6,444
)
Property, plant and equipment, net

$
3,132


$
3,301