Inventories

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Inventories

Inventories

	September 30, 2021		December 31, 2020
Finished goods	$	479	$	528
Work-in-process	640		629
Purchased raw materials	264		292
Operating supplies	37		39
Total inventories	$	1,420	$	1,488

At September 30, 2021 and December 31, 2020, the portion of inventories valued on a last-in, first-out (“LIFO”) basis was $500 and $458, respectively. These amounts exclude the effects of LIFO valuation reductions, which were $173 and $131 at September 30, 2021 and December 31, 2020, respectively.