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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Income from continuing operations after income taxes $ 119 $ 66 $ 653 $ 229
Less: Preferred stock dividends declared (18) (18) (53) (52)
Income from continuing operations available to Arconic common shareholders 101 48 600 177
Income from discontinued operations after income taxes and noncontrolling interests   100   88
Net income available to Arconic common shareholders - basic 101 148 600 265
Add: Interest expense related to convertible notes 2 2 7  
Add: Dividends related to mandatory convertible preferred stock     50  
Net income available to Arconic common shareholders - diluted $ 103 $ 150 $ 657 $ 265
Weighted average shares outstanding - basic 442 438 441 438
Stock options 1 1 2 1
Stock and performance awards 5 5 5 4
Mandatory convertible preferred stock     39  
Convertible notes 14 9 14  
Weighted average shares outstanding - diluted 462 453 501 443