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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net income $ 120 $ 212 $ 263 $ 534
Less: Preferred stock dividends declared 0 (18) (1) (35)
Net income available to Arconic common shareholders - basic 120 194 262 499
Add: Interest expense related to convertible notes 3 2 6 4
Add: Dividends related to mandatory convertible preferred stock 0 0 0 34
Net income available to Arconic common shareholders - diluted $ 123 $ 196 $ 268 $ 537
Average shares outstanding - basic (in shares) 483 441 483 440
Effect of dilutive securities:        
Stock options (in shares) 0 2 0 2
Stock and performance awards (in shares) 5 5 5 5
Mandatory convertible preferred stock (in shares) 0 0 0 39
Convertible notes (in shares) 14 14 14 14
Weighted average shares outstanding - diluted (in shares) 502 462 502 500