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Earnings Per Share - Reconciliation of Information Used to Compute Basic and Diluted EPS (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Income from continuing operations after income taxes	$ 322	$ 110
Less: Preferred stock dividends declared	(17)	(18)
Income from continuing operations available to Arconic common shareholders	305	92
Income (loss) from discontinued operations after income taxes and noncontrolling interests		(94)
Net income (loss) available to Arconic common shareholders - basic	305	(2)
Add: Interest expense related to convertible notes	2
Add: Dividends related to mandatory convertible preferred stock	17
Net income (loss) available to Arconic common shareholders - diluted	$ 324	$ (2)
Average shares outstanding - basic	440	438
Stock options	1
Stock and performance awards	5
Mandatory convertible preferred stock	39
Convertible notes	14
Average shares outstanding - diluted	499	438

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The after-tax amount of any dividends on convertible preferred stock.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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