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Inventories
3 Months Ended
Mar. 31, 2015
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,
2015
 
December 31,
2014
Raw materials
$
2,990

 
$
2,986

Work-in-process
2,335

 
2,455

Finished goods
6,514

 
6,504

Supplies
260

 
260

Total inventories
$
12,099

 
$
12,205