Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory Components

December 31,	2018			2017
Finished goods	$	346		$	296
Work-in-process		315			258
Bauxite and alumina		609			585
Purchased raw materials		535			473
Operating supplies		146			147
LIFO reserve		(307	)		(306	)
	$	1,644		$	1,453