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Property, Plant & Equipment (Tables)
6 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
The following table summarizes our property, plant and equipment at June 30, 2019 and December 31, 2018:
Millions of dollars

June 30, 2019

December 31, 2018
Land

$
101


$
102

Buildings

1,607


1,593

Machinery and equipment

7,971


7,909

Accumulated depreciation

(6,361
)

(6,190
)
Property, plant and equipment, net

$
3,318


$
3,414