Inventories (Tables)
 6 Months Ended
Jun. 30, 2011
Inventories - (Policies) [Abstract]  
Inventories [Table]
   
June 30,
  
December 31,
 
Millions of dollars
 
2011
  
2010
 
Finished products and parts
    $1,559     $1,369 
Raw materials and supplies
  621   496 
Work in process
  55   75 
Total
    $2,235     $1,940