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Inventories
6 Months Ended
Jun. 30, 2012
Inventory Disclosure [Abstract]  
Inventories
   Inventories
 
Inventories (principally using the last-in, first-out (LIFO) method) are comprised of the following:
 
(Millions of dollars)
June 30,
2012
 
December 31,
2011
Raw materials
$
4,143

 
$
3,766

Work-in-process
3,504

 
2,959

Finished goods
9,429

 
7,562

Supplies
268

 
257

Total inventories
$
17,344

 
$
14,544