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Inventories
3 Months Ended
Mar. 31, 2012
Inventories  
Inventories

5.                                      Inventories

 

Inventories (principally using the last-in, first-out (LIFO) method) are comprised of the following:

 

(Millions of dollars)

 

March 31,
2012

 

December 31,
2011

 

Raw materials

 

$

4,094

 

$

3,766

 

Work-in-process

 

3,345

 

2,959

 

Finished goods

 

8,807

 

7,562

 

Supplies

 

265

 

257

 

Total inventories

 

$

16,511

 

$

14,544