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Earnings Per Share - Reconciliation of Information Used to Compute Basic and Diluted EPS (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Earnings Per Share [Abstract] |  |  |  |
Net income from continuing operations attributable to common shareholders | $ 27 | $ 36 | $ 181 | $ 105
Income from discontinued operations | 0 | 0 | 0 | 50
Net income | 27 | 36 | 181 | 155
Less: preferred stock dividends declared | 1 | 1 | 2 | 2
Net income available to Howmet Aerospace common shareholders - basic | 26 | 35 | 179 | 153
Net income available to Howmet Aerospace common shareholders - diluted | $ 26 | $ 35 | $ 179 | $ 153
Average shares outstanding - basic (in shares) | 429 | 436 | 431 | 436
Effect of dilutive securities: |  |  |  |
Stock options (in shares) | 1 | 0 | 1 | 0
Stock and performance awards (in shares) | 4 | 3 | 5 | 4
Average shares outstanding - diluted (in shares) | 434 | 439 | 437 | 440

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