Inventories

3 Months Ended

Mar. 31, 2022

Inventory Disclosure [Abstract]

Inventories

Inventories

	March 31, 2022		December 31, 2021
Finished goods	$	487	$	478
Work-in-process	676		631
Purchased raw materials	279		256
Operating supplies	41		37
Total inventories	$	1,483	$	1,402

At March 31, 2022 and December 31, 2021, the portion of inventories valued on a last-in, first-out (“LIFO”) basis was $588 and $523, respectively. These amounts exclude the effects of LIFO valuation reductions, which were $201 and $192 at March 31, 2022 and December 31, 2021, respectively.