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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
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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

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