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Investments (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity Method Investments And Joint Ventures [Abstract] |
Summary of Unaudited Financial Information for Alcoa Corporation's Equity Investments | A summary of unaudited financial information for Alcoa Corporation’s equity investments is as follows (amounts represent 100% of investee financial information):
Second quarter ended June 30, 2021 |  | Saudi Arabia Joint Venture |  |  | Mining |  |  | Energy |  |  | Other |
Sales |  | $ | 741 |  |  | $ | 197 |  |  | $ | 60 |  |  | $ | 96 |
Cost of goods sold |  |  | 508 |  |  |  | 146 |  |  |  | 32 |  |  |  | 78 |
Net income (loss) |  |  | 102 |  |  |  | 25 |  |  |  | 27 |  |  |  | (4 | )
Equity in net income (loss) of affiliated companies, before reconciling adjustments |  |  | 26 |  |  |  | 9 |  |  |  | 11 |  |  |  | (2 | )
Other |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | 8 |
Alcoa Corporation’s equity in net income of affiliated companies |  |  | 26 |  |  |  | 8 |  |  |  | 11 |  |  |  | 6 |
Second quarter ended June 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 507 |  |  | $ | 209 |  |  | $ | 47 |  |  | $ | 85 |
Cost of goods sold |  |  | 446 |  |  |  | 130 |  |  |  | 24 |  |  |  | 75 |
Net (loss) income |  |  | (75 | ) |  |  | (5 | ) |  |  | 20 |  |  |  | (6 | )
Equity in net (loss) income of affiliated companies, before reconciling adjustments |  |  | (19 | ) |  |  | 3 |  |  |  | 7 |  |  |  | (3 | )
Other |  |  | (1 | ) |  |  | 2 |  |  |  | 1 |  |  |  | 5 |
Alcoa Corporation’s equity in net (loss) income of affiliated companies |  |  | (20 | ) |  |  | 5 |  |  |  | 8 |  |  |  | 2 |
Six months ended June 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 1,423 |  |  | $ | 370 |  |  | $ | 115 |  |  | $ | 191 |
Cost of goods sold |  |  | 1,011 |  |  |  | 269 |  |  |  | 57 |  |  |  | 171 |
Net income (loss) |  |  | 147 |  |  |  | 20 |  |  |  | 52 |  |  |  | (6 | )
Equity in net income (loss) of affiliated companies, before reconciling adjustments |  |  | 37 |  |  |  | 10 |  |  |  | 21 |  |  |  | (3 | )
Other |  |  | (4 | ) |  |  | (1 | ) |  |  | — |  |  |  | 11 |
Alcoa Corporation’s equity in net income of affiliated companies |  |  | 33 |  |  |  | 9 |  |  |  | 21 |  |  |  | 8 |
Six months ended June 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 1,092 |  |  | $ | 427 |  |  | $ | 106 |  |  | $ | 158 |
Cost of goods sold |  |  | 908 |  |  |  | 278 |  |  |  | 50 |  |  |  | 142 |
Net (loss) income |  |  | (88 | ) |  |  | 4 |  |  |  | 47 |  |  |  | (15 | )
Equity in net (loss) income of affiliated companies, before reconciling adjustments |  |  | (22 | ) |  |  | 9 |  |  |  | 18 |  |  |  | (7 | )
Other |  |  | (4 | ) |  |  | (1 | ) |  |  | (1 | ) |  |  | 10 |
Alcoa Corporation’s equity in net (loss) income of affiliated companies |  |  | (26 | ) |  |  | 8 |  |  |  | 17 |  |  |  | 3 |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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