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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
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Earnings Per Share [Abstract] |  |
Net income from continuing operations attributable to common shareholders | $ 80 | $ 153
Income from discontinued operations | 0 | 62
Net income | 80 | 215
Less: preferred stock dividends declared | 1 | 1
Net income available to Howmet Aerospace common shareholders - basic and diluted | $ 79 | $ 214
Average shares outstanding - basic (in shares) | 434 | 435
Effect of dilutive securities: |  |
Stock options (in shares) | 1 | 1
Stock and performance awards (in shares) | 4 | 4
Average shares outstanding - diluted (in shares) | 439 | 440

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