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Earnings Per Share - Reconciliation of Information Used to Compute Basic and Diluted EPS (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]      
Net income (loss) from continuing operations attributable to Arconic $ 642 $ (74) $ (1,062)
Less: preferred stock dividends declared (2) (53) (69)
Income (loss) from continuing operations available to Arconic common shareholders 640 (127) (1,131)
Income (loss) from discontinued operations after income taxes and noncontrolling interests 0 0 121
Net income (loss) available to Arconic common shareholders—basic 640 (127) (1,010)
Add: interest expense related to convertible notes 11 0 0
Net income (loss) available to Arconic common shareholders - diluted $ 651 $ (127) $ (1,010)
Average shares outstanding - basic 483 451 438
Effect of dilutive securities:      
Stock options 1 0 0
Stock and performance awards 5 0 0
Convertible notes 14 0 0
Average shares outstanding - diluted 503 451 438