Inventories

3 Months Ended

Mar. 31, 2016

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, 2016		December 31, 2015
Raw materials	$	2,500	$	2,467
Work-in-process	1,897		1,857
Finished goods	5,205		5,122
Supplies	247		254
Total inventories	$	9,849	$	9,700