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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share [Abstract] |  |  |
Net income (loss) | $ 470 | $ 642 | $ (74)
Less: preferred stock dividends declared | (2) | (2) | (53)
Net income (loss) available to Arconic common shareholders - basic | 468 | 640 | (127)
Add: interest expense related to convertible notes | 9 | 11 | 0
Net income (loss) available to Arconic common shareholders - diluted | $ 477 | $ 651 | $ (127)
Average shares outstanding - basic | 446 | 483 | 451
Effect of dilutive securities: |  |  |
Stock options | 1 | 1 | 0
Stock and performance awards | 5 | 5 | 0
Convertible notes(1) | 11 | 14 | 0
Average shares outstanding - diluted | 463 | 503 | 451

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