Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Reconciliation of Information Used to Compute Basic and Diluted EPS

The information used to compute basic and diluted EPS attributable to Arconic common shareholders was as follows (shares in millions):

	2017			2016			2015
Net loss from continuing operations attributable to Arconic	$	(74	)	$	(1,062	)	$	(156	)
Net income from continuing operations attributable to noncontrolling interests	—			—			(1		)
Less: preferred stock dividends declared	(53		)	(69		)	(69		)
Loss from continuing operations available to Arconic common shareholders	(127		)	(1,131		)	(226		)
Income (loss) from discontinued operations after income taxes and noncontrolling interests(1)	—			121			(165		)
Net loss available to Arconic common shareholders—basic	(127		)	(1,010		)	(391		)
Add: interest expense related to convertible notes	—			—			—
Add: dividends related to mandatory convertible preferred stock	—			—			—
Net loss available to Arconic common shareholders—diluted	$	(127	)	$	(1,010	)	$	(391	)
Average shares outstanding—basic	451			438			420
Effect of dilutive securities:
Stock options	—			—			—
Stock and performance awards	—			—			—
Mandatory convertible preferred stock	—			—			—
Convertible notes	—			—			—
Average shares outstanding—diluted	451			438			420

⁽¹⁾  Calculated from the Statement of Consolidated Operations as Income (loss) from discontinued operations after income taxes less Net income from discontinued operations attributable to noncontrolling interests.