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

March 31,
2017

December 31,
2016
Land

$
128


$
128

Buildings

1,632


1,652

Machinery and equipment

8,213


8,085

Accumulated depreciation

(6,181
)

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

$
3,792


$
3,810