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Inventories (Tables)
 12 Months Ended
Dec. 31, 2013
Inventory Disclosure [Abstract]  
Inventories
Inventories (principally using the LIFO method) are comprised of the following:
 
 
 
December 31,
(Millions of dollars)
 
2013
 
2012
 
2011
Raw materials
 
$
2,966

 
$
3,573

 
$
3,766

Work-in-process
 
2,589

 
2,920

 
2,959

Finished goods
 
6,785

 
8,767

 
7,562

Supplies
 
285

 
287

 
257

Total inventories
 
$
12,625

 
$
15,547

 
$
14,544