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

March 31, 2018

December 31, 2017
Land

$
125


$
123

Buildings

1,810


1,789

Machinery and equipment

9,017


8,946

Accumulated depreciation

(6,982
)

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

$
3,970


$
4,033