Inventories (Tables)

3 Months Ended

Mar. 31, 2021

Inventory Disclosure [Abstract]

Schedule of Inventory Components

	March 31, 2021		December 31, 2020
Finished goods	$	303	$	321
Work-in-process		106		112
Bauxite and alumina		439		412
Purchased raw materials		397		377
Operating supplies		172		176
	$	1,417	$	1,398