Statement of Combined Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total sales	$ 1,890	$ 1,415	$ 5,366	$ 4,213
Cost of goods sold (exclusive of expenses below)	1,676	1,218	4,674	3,614
Selling, general administrative, and other expenses	63	59	183	194
Research and development expenses	8	8	25	27
Provision for depreciation and amortization	61	63	186	191
Restructuring and other charges (E)	14	3	612	61
Operating income (loss)	68	64	(314)	126
Interest expense	26	22	74	97
Other expenses, net	15	27	52	69
Income (Loss) before income taxes	27	15	(440)	(40)
Provision (Benefit) for income taxes	11	10	(81)	5
Net income (loss)	16	5	(359)	(45)
Less: Net income attributable to noncontrolling interest	0	0	0	0
Net income (loss) attributable to Arconic Corporation	$ 16	$ 5	$ (359)	$ (45)
Earnings Per Share Attributable to Arconic Corporation Common Stockholders
Basic	$ 0.15	$ 0.05	$ (3.28)	$ (0.41)
Diluted	$ 0.15	$ 0.05	$ (3.28)	$ (0.41)