Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Inventories

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

(Millions of dollars)	March 31, 2019		December 31, 2018
Raw materials	$	3,592	$	3,382
Work-in-process	2,737		2,674
Finished goods	5,785		5,241
Supplies	226		232
Total inventories	$	12,340	$	11,529