Inventories (Tables)

9 Months Ended

Sep. 30, 2017

Inventory Disclosure [Abstract]

Inventories

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

(Millions of dollars)	September 30, 2017		December 31, 2016
Raw materials	$	2,777	$	2,102
Work-in-process	2,241		1,719
Finished goods	4,990		4,576
Supplies	204		217
Total inventories	$	10,212	$	8,614