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Property, Plant & Equipment (Tables)
 6 Months Ended
Jun. 30, 2017
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
The following table summarizes our property, plant and equipment as of June 30, 2017 and December 31, 2016:
Millions of dollars

June 30,
2017

December 31,
2016
Land

$
123


$
128

Buildings

1,666


1,652

Machinery and equipment

8,564


8,085

Accumulated depreciation

(6,542
)

(6,055
)
Property, plant and equipment, net

$
3,811


$
3,810