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Inventories
3 Months Ended
Mar. 31, 2013
Inventory Disclosure [Abstract]  
Inventories
   Inventories
 
Inventories (principally using the last-in, first-out (LIFO) method) are comprised of the following:
 
(Millions of dollars)
March 31,
2013
 
December 31,
2012
Raw materials
$
3,536

 
$
3,573

Work-in-process
2,906

 
2,920

Finished goods
8,345

 
8,767

Supplies
287

 
287

Total inventories
$
15,074

 
$
15,547