Inventories

9 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Inventories

   Inventories

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

 

(Millions of dollars)	September 30, 2019		December 31, 2018
Raw materials	$	4,424	$	4,477
Work-in-process	1,335		1,259
Finished goods	6,177		5,562
Supplies	244		231
Total inventories	$	12,180	$	11,529

During the third quarter of 2019, changes were made to the classification of inventories primarily related to purchased parts between Raw materials, Work-in-process and Finished goods. The prior year amounts have been retrospectively adjusted to conform to the current-year classification.