Inventories

6 Months Ended

Jun. 30, 2018

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, 2018		December 31, 2017
Raw materials	$	3,277	$	2,802
Work-in-process	2,678		2,254
Finished goods	5,092		4,761
Supplies	208		201
Total inventories	$	11,255	$	10,018