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Other Expense (Income), Net - Additional Information (Details) € in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 EUR (€)
Other Non operating Income Expense [Line Items] |  |  |  |
Income tax benefit | $ 40 | $ (84) | $ (119) |
Alcoa Corporation |  |  |  |
Other Non operating Income Expense [Line Items] |  |  |  |
Tax agreement, indemnification of ultimate liability, percent |  |  |  | 49.00%
Spain |  |  |  |
Other Non operating Income Expense [Line Items] |  |  |  |
Income taxes receivable | € |  |  |  | € 53
Tax agreement, indemnification of ultimate liability, percent |  |  | 49.00% | 33.66%
Spain | Other Nonoperating Income (Expense) | Alcoa Corporation |  |  |  |
Other Non operating Income Expense [Line Items] |  |  |  |
Income tax benefit |  |  | $ 29 |

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