Inventories (Tables)
9 Months Ended
Sep. 30, 2011
Inventories [Abstract] 
Inventories
 
September 30,
  
December 31,
 
Millions of dollars
 
2011
  
2010
 
Finished products and parts
 $1,675  $1,369 
Raw materials and supplies
  646   496 
Work in process
  91   75 
Total
 $2,412  $1,940