Inventories

3 Months Ended

Mar. 31, 2023

Inventory Disclosure [Abstract]

Inventories

Inventories

	March 31, 2023		December 31, 2022
Finished goods	$	501	$	490
Work-in-process	782		748
Purchased raw materials	322		317
Operating supplies	57		54
Total inventories	$	1,662	$	1,609

At March 31, 2023 and December 31, 2022, the portion of inventories valued on a last-in, first-out (“LIFO”) basis was $438 and $441, respectively. If valued on an average-cost basis, total inventories would have been $224 and $220 higher as of March 31, 2023 and December 31, 2022, respectively.