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Property, Plant & Equipment (Tables)
9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
The following table summarizes our property, plant and equipment as of September 30, 2018 and December 31, 2017:
Millions of dollars

September 30, 2018

December 31, 2017
Land

$
122


$
123

Buildings

1,671


1,789

Machinery and equipment

7,819


8,946

Accumulated depreciation

(6,216
)

(6,825
)
Property, plant and equipment, net

$
3,396


$
4,033