Statement of Consolidated Operations (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Sales (L)	$ 5,213	$ 5,573	$ 15,455	$ 17,289
Cost of goods sold (exclusive of expenses below)	4,217	4,559	12,474	13,665
Selling, general administrative, and other expenses (R)	275	261	821	717
Research and development expenses	38	55	119	178
Provision for depreciation, depletion, and amortization	316	318	934	958
Restructuring and other charges (D)	18	66	134	460
Interest expense	133	123	389	369
Other income, net (K)	(117)	(15)	(120)	(27)
Total costs and expenses	4,880	5,367	14,751	16,320
Income before income taxes	333	206	704	969
Provision for income taxes	147	100	329	401
Net income	186	106	375	568
Less: Net income attributable to noncontrolling interests	20	62	58	189
Consolidated net income attributable to Arconic	166	44	317	379
AMOUNTS ATTRIBUTABLE TO ARCONIC COMMON SHAREHOLDERS (N):
Net income	$ 148	$ 26	$ 265	$ 327
Earnings per share:
Basic	$ 0.34	$ 0.06	$ 0.60	$ 0.79
Diluted	0.33	0.06	0.60	0.78
Dividends paid per share	$ 0.09	$ 0.09	$ 0.27	$ 0.27