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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings Per Share [Abstract] |  |  |  |
Net (loss) income | $ (121) | $ 120 | $ 66 | $ 263
Less: preferred stock dividends declared | 0 | 0 | (1) | (1)
Net (loss) income available to Arconic common shareholders - basic | (121) | 120 | 65 | 262
Add: Interest expense related to convertible notes | 0 | 3 | 0 | 6
Net (loss) income available to Arconic common shareholders - diluted | $ (121) | $ 123 | $ 65 | $ 268
Average shares outstanding - basic (in shares) | 445 | 483 | 458 | 483
Effect of dilutive securities: |  |  |  |
Stock options (in shares) | 0 | 0 | 0 | 0
Stock and performance awards (in shares) | 0 | 5 | 4 | 5
Convertible notes (in shares) | 0 | 14 | 0 | 14
Average shares outstanding - diluted (in shares) | 445 | 502 | 462 | 502
Common stock outstanding (in shares) | 440 | 483 | 440 | 483
Incremental common shares attributable to dilutive effect of accelerated share repurchase agreements (in shares) |  |  | 45 |

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