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Separation Transactions - Additional Information (Details) |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 08, 2019 company | Oct. 02, 2017 shares | May 04, 2017 | Feb. 28, 2017 USD ($) $ / shares shares | Nov. 30, 2016 shares | Sep. 30, 2014 shares | May 31, 2017 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) | Jun. 30, 2017 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Feb. 07, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of independent, publicly-traded companies resulting from proposed separation transaction | company | 2 |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  |  |  |  |  | $ 620,000,000 | $ 9,000,000 | $ 165,000,000 |
Common stock sold (in shares) | shares |  | 24,022 |  |  |  | 25,000,000 |  |  | 12,958,767 |  |  |  |
Common stock sold per share (usd per share) | $ / shares |  |  |  |  |  |  |  |  | $ 35.91 |  |  |  |
Pre-tax gain on sale of common stock |  |  |  |  |  |  |  |  | $ 167,000,000 |  |  | 167,000,000 |
Proceeds from Alcoa Corporation's sale of Yadkin Hydroelectric Project |  |  |  |  |  |  |  |  |  | (2,000,000) | $ (1,000,000) | 243,000,000 |
Costs related to separation transaction, pre-tax |  |  |  |  |  |  |  | $ 34,000,000 |  |  |  |  |
Costs related to separation transaction, after-tax |  |  |  |  |  |  |  | $ 28,000,000 |  |  |  |  |
Selling, General Administrative, and Other Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Costs related to separation transaction, pre-tax |  |  |  |  |  |  |  |  |  |  |  | 18,000,000 |
Costs related to separation transaction, after-tax |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 |
Alcoa Corporation |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock retained |  |  |  |  | 19.90% |  |  |  |  |  |  |  |
Number of common stock retained (in shares) | shares |  |  |  |  | 36,311,767 |  |  |  |  |  |  |  |
Common stock sold (in shares) | shares |  |  |  | 23,353,000 |  |  | 12,958,767 |  |  |  |  |  |
Common stock sold per share (usd per share) | $ / shares |  |  |  | $ 38.03 |  |  |  |  |  |  |  |  |
Cash proceeds sale of common stock |  |  |  | $ 888,000,000 |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of common stock |  |  |  | $ 351,000,000 |  |  |  |  |  |  |  |  |
Proceeds from Alcoa Corporation's sale of Yadkin Hydroelectric Project |  |  |  |  |  |  |  |  |  |  |  | $ 243,000,000 |
Percentage of ownership after transaction |  |  | 0.00% |  |  |  |  |  |  |  |  |  |
Investment Banks |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 805,000,000 |  |  |  |
Common stock sold per share (usd per share) | $ / shares |  |  |  |  |  |  | $ 35.91 |  |  |  |  |  |
Pre-tax gain on sale of common stock |  |  |  |  |  |  | $ 167,000,000 |  |  |  |  |  |
Other Restructuring | Proposed Separation Transaction | Selling, General Administrative, and Other Expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other charges |  |  |  |  |  |  |  |  |  | $ 78,000,000 |  |  |
Subsequent Event | Second-Lien Notes Due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000,000
Convertible notes, interest rate percentage |  |  |  |  |  |  |  |  |  |  |  |  | 6.125%

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