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Property (Tables)
9 Months Ended
Sep. 30, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
The following table summarizes our property, plant and equipment as of September 30, 2014 and December 31, 2013:
Millions of dollars
 
September 30,
2014
 
December 31,
2013
Land
 
$
73

 
$
76

Buildings
 
1,282

 
1,303

Machinery and equipment
 
7,793

 
7,940

Accumulated depreciation
 
(6,162
)
 
(6,278
)
Property, plant and equipment, net
 
$
2,986

 
$
3,041