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Earnings Per Share - Reconciliation of Information Used to Compute Basic and Diluted EPS (Detail) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]      
Net loss from continuing operations attributable to Arconic $ (1,062) $ (156) $ (61)
Net income from continuing operations attributable to noncontrolling interests   1  
Less: preferred stock dividends declared 69 69 21
Loss from continuing operations available to Arconic common shareholders (1,131) (226) (82)
Income (loss) from discontinued operations after income taxes and noncontrolling interests 121 165 (329)
Net (loss) income available to Arconic common shareholders-basic (1,010) (391) 247
Add: interest expense related to convertible notes 0 0 0
Add: dividends related to mandatory convertible preferred stock 0 0 0
Net (loss) income available to Arconic common shareholders-diluted $ (1,010) $ (391) $ 247
Average shares outstanding-basic 438 420 387
Stock options     2
Stock and performance awards     4
Mandatory convertible preferred stock 0 0 0
Convertible notes 0 0 0
Average shares outstanding-diluted 438 420 393