Common Stock	3 Months Ended
Mar. 31, 2019
Equity [Abstract]
Common Stock	Common Stock On February 19, 2019, the Company entered into an accelerated share repurchase (ASR) agreement with JPMorgan Chase Bank to repurchase $700 of its common stock, pursuant to the share repurchase programs previously authorized by its Board of Directors (the Board). Under the ASR agreement, Arconic received an initial delivery of 31,908,831 shares on February 21, 2019, which were immediately retired. On April 25, 2019, the ASR concluded with the Company receiving 4,525,592 additional shares on April 29, 2019, which were immediately retired. A total of 36,434,423 shares, at an average price of $19.21 per share, were repurchased under the agreement. As of April 29, 2019, there were 448,629,078 shares of common stock outstanding. After giving effect to the ASR, $300 remains available under the prior authorizations by the Board for share repurchases through the end of 2020.

Common Stock

3 Months Ended

Mar. 31, 2019

On February 19, 2019, the Company entered into an accelerated share repurchase (ASR) agreement with JPMorgan Chase Bank to repurchase $700 of its common stock, pursuant to the share repurchase programs previously authorized by its Board of Directors (the Board). Under the ASR agreement, Arconic received an initial delivery of 31,908,831 shares on February 21, 2019, which were immediately retired. On April 25, 2019, the ASR concluded with the Company receiving 4,525,592 additional shares on April 29, 2019, which were immediately retired. A total of 36,434,423 shares, at an average price of $19.21 per share, were repurchased under the agreement. As of April 29, 2019, there were 448,629,078 shares of common stock outstanding.

After giving effect to the ASR, $300 remains available under the prior authorizations by the Board for share repurchases through the end of 2020.