Earnings Per Share and Common Stock - Reconciliation of Information Used to Compute Basic and Diluted EPS (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net income attributable to common shareholders	$ 148	$ 131
Less: preferred stock dividends declared	1	1
Net income available to Howmet Aerospace common shareholders - basic	147	130
Net income available to Howmet Aerospace common shareholders - diluted	$ 147	$ 130
Average shares outstanding - basic (in shares)	412	419
Effect of dilutive securities:
Stock and performance awards (in shares)	6	6
Average shares outstanding - diluted (in shares)	418	425