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Earnings Per Share | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Earnings Per Share | F. Earnings Per Share – Basic earnings per share (EPS) amounts are computed by dividing earnings by the average number of common shares outstanding. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive share equivalents outstanding. The information used to compute basic and diluted EPS attributable to Alcoa Corporation common shareholders was as follows (shares in millions):
|  | Second quarter ended June 30, |  |  | Six months ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Net income (loss) attributable to Alcoa Corporation |  | $ | 309 |  |  | $ | (197 | ) |  | $ | 484 |  |  | $ | (117 | )
Average shares outstanding – basic |  |  | 187 |  |  |  | 186 |  |  |  | 186 |  |  |  | 186 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Stock units |  |  | 3 |  |  |  | — |  |  |  | 3 |  |  |  | — |
Average shares outstanding – diluted |  |  | 190 |  |  |  | 186 |  |  |  | 189 |  |  |  | 186 |
Options to purchase less than one million shares of common stock outstanding at June 30, 2021 were excluded because they had a weighted average exercise price of $44.11 per share which was greater than the average market price of Alcoa Corporation’s common stock. In the second quarter and six-month period of 2020, basic average shares outstanding and diluted average shares outstanding were the same because the effect of potential shares of common stock was anti-dilutive. Had Alcoa generated net income in the second quarter or six-month period of 2020, one million common share equivalents related to six million outstanding stock units and stock options combined would have been included in diluted average shares outstanding for the periods. Options to purchase two million shares of common stock outstanding at June 30, 2020 were excluded because they had a weighted average exercise price of $26.45 per share which was greater than the average market price of Alcoa Corporation’s common stock.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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