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Earnings Per Share - Schedule of Computation of Basic and Diluted EPS Attributable to Alcoa Corporation Common Shareholders (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Earnings Per Share [Abstract]
Net Income (Loss)	$ (252)	$ (231)	$ (231)
Average shares outstanding – basic	179	178
Effect of dilutive securities:
Average shares outstanding – diluted	179	178

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