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Inventories (Tables)
12 Months Ended
Dec. 31, 2011
Inventories [Abstract]  
Inventories
   
December 31
 
Millions of dollars
 
2011
  
2010
 
Finished products and parts
 $1,801  $1,369 
Raw materials and supplies
  673   496 
Work in process
  96   75 
Total
 $2,570  $1,940