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

March 31, 2020

December 31, 2019
Land

$
88


$
97

Buildings

1,503


1,540

Machinery and equipment

7,953


8,108

Accumulated depreciation

(6,388
)

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

$
3,156


$
3,301