Inventories

12 Months Ended

Dec. 31, 2021

Inventory Disclosure [Abstract]

Inventories

Inventories

December 31,	2021		2020
Finished goods	$	478	$	528
Work-in-process	631		629
Purchased raw materials	256		292
Operating supplies	37		39
Total inventories	$	1,402	$	1,488

At December 31, 2021 and 2020, the portion of inventories valued on a LIFO basis was $523 and $458, respectively. These amounts exclude the effects of LIFO valuation reductions, which were $192 and $131 at December 31, 2021 and 2020, respectively.