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Property, Plant & Equipment (Tables)
9 Months Ended
Sep. 30, 2015
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
The following table summarizes our property, plant and equipment as of September 30, 2015 and December 31, 2014:
Millions of dollars
 
September 30,
2015
 
December 31,
2014
Land
 
$
133

 
$
142

Buildings
 
1,592

 
1,616

Machinery and equipment
 
7,923

 
8,182

Accumulated depreciation
 
(5,964
)
 
(5,959
)
Property, plant and equipment, net
 
$
3,684

 
$
3,981