Inventories

6 Months Ended

Jun. 30, 2017

Inventory Disclosure [Abstract]

Inventories

Inventories

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

(Millions of dollars)	June 30, 2017		December 31, 2016
Raw materials	$	2,540	$	2,102
Work-in-process	1,954		1,719
Finished goods	4,690		4,576
Supplies	204		217
Total inventories	$	9,388	$	8,614