Inventories

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

Inventories

Inventories

	June 30, 2021		December 31, 2020
Finished goods	$	500	$	528
Work-in-process	656		629
Purchased raw materials	263		292
Operating supplies	37		39
Total inventories	$	1,456	$	1,488

At June 30, 2021 and December 31, 2020, the portion of inventories valued on a last-in, first-out (“LIFO”) basis was $490 and $458, respectively. If valued on an average-cost basis, total inventories would have been $152 and $131 higher at June 30, 2021 and December 31, 2020, respectively.