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PROPERTY, PLANT AND EQUIPMENT
12 Months Ended
Dec. 31, 2014
Property Plant And Equipment [Abstract]  
Property, Plant and Equipment

Note 9. Property, Plant and Equipment - Net

  December 31,  
  2014 2013 
 Land and improvements $343 $376 
 Machinery and equipment  10,313  10,437 
 Buildings and improvements  3,119  3,157 
 Construction in progress  727  647 
   14,502  14,617 
 Less—Accumulated depreciation  (9,119)  (9,339) 
  $5,383 $5,278 

Depreciation expense was $667 million, $670 million and $660 million in 2014, 2013 and 2012, respectively.