Inventories

6 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

Inventories

Inventories

	June 30, 2019		December 31, 2018
Finished goods	$	701	$	668
Work-in-process	1,447		1,371
Purchased raw materials	361		366
Operating supplies	97		87
Total inventories	$	2,606	$	2,492

At June 30, 2019 and December 31, 2018, the portion of inventories valued on a last-in, first-out (LIFO) basis was $1,343 and $1,292, respectively. If valued on an average-cost basis, total inventories would have been $506 and $530 higher at June 30, 2019 and December 31, 2018, respectively.