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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