Inventories

3 Months Ended

Mar. 31, 2021

Inventory Disclosure [Abstract]

Inventories

Inventories

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

(Millions of dollars)	March 31, 2021		December 31, 2020
Raw materials	$	4,233	$	4,021
Work-in-process	1,267		1,052
Finished goods	6,371		6,054
Supplies	278		275
Total inventories	$	12,149	$	11,402