Statement of Consolidated Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Sales (C)	$ 3,209	$ 3,541
Cost of goods sold (exclusive of expenses below)	2,476	2,818
Selling, general administrative, and other expenses	169	178
Research and development expenses	15	22
Provision for depreciation and amortization	129	137
Restructuring and other charges (D)	21	12
Operating income	399	374
Interest expense	91	85
Other expense, net (E)	17	32
Income before income taxes	291	257
Provision for income taxes (G)	76	70
Net income	215	187
Amounts Attributable to Howmet Aerospace Common Shareholders (H):
Net income	$ 214	$ 186
Earning per share - basic (in usd per share)	$ 0.49	$ 0.40
Earning per share - diluted (in usd per share)	$ 0.49	$ 0.39
Average Shares Outstanding (H):
Average shares outstanding - basic (in shares)	435	471
Average shares outstanding - diluted (in shares)	440	489