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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Earnings Per Share [Abstract] |  |  |  |
Net income | $ 95 | $ 161 | $ 161 | $ 424
Less: preferred stock dividends declared | (1) | (1) | (2) | (2)
Net income available to Arconic common shareholders - basic | 94 | 160 | 159 | 422
Add: Interest expense related to convertible notes | 3 | 3 | 0 | 8
Net income available to Arconic common shareholders - diluted | $ 97 | $ 163 | $ 159 | $ 430
Average shares outstanding - basic (in shares) | 436 | 483 | 451 | 483
Effect of dilutive securities: |  |  |  |
Stock options (in shares) | 1 | 0 | 1 | 1
Stock and performance awards (in shares) | 5 | 5 | 3 | 5
Convertible notes (in shares) | 15 | 14 | 0 | 14
Average shares outstanding - diluted (in shares) | 457 | 502 | 455 | 503
Common stock outstanding (in shares) | 434 | 483 | 434 | 483
Incremental common shares attributable to dilutive effect of accelerated share repurchase agreements (in shares) |  |  | 52 |

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