Inventories

9 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Inventories

Inventories

	September 30, 2019		December 31, 2018
Finished goods	$	696	$	668
Work-in-process	1,410		1,371
Purchased raw materials	350		366
Operating supplies	99		87
Total inventories	$	2,555	$	2,492

At September 30, 2019 and December 31, 2018, the portion of inventories valued on a last-in, first-out (LIFO) basis was $1,310 and $1,292, respectively. If valued on an average-cost basis, total inventories would have been $471 and $530 higher at September 30, 2019 and December 31, 2018, respectively.