Inventories

9 Months Ended

Sep. 30, 2020

Inventory Disclosure [Abstract]

Inventories

Inventories

	September 30, 2020		December 31, 2019
Finished goods	$	539	$	524
Work-in-process	683		741
Purchased raw materials	326		299
Operating supplies	44		43
Total inventories	$	1,592	$	1,607

At September 30, 2020 and December 31, 2019, the portion of inventories valued on a last-in, first-out (LIFO) basis was $488 and $503, respectively. If valued on an average-cost basis, total inventories would have been $127 and $133 higher at September 30, 2020 and December 31, 2019, respectively.