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Contingencies and Commitments - Contingencies (Details) € in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 06, 2019 plaintiff | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) location | Dec. 31, 2019 EUR (€) location | Dec. 31, 2018 USD ($) | Dec. 31, 2019 EUR (€) | Sep. 30, 2018
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of cleanup locations (more than) | location |  |  | 100 | 100 |  |  |
Remediation reserve balance |  |  | $ 230 |  | $ 266 |  |
Remediation reserve balance, classified as a current liability |  |  | 94 |  | 81 |  |
Payments related to remediation expenses applied against the reserve |  |  | 65 |  | $ 32 |  |
Total combined assessments |  |  | 172 |  |  | € 154 |
Tax agreement, indemnification of ultimate liability, percent |  |  |  |  | 49.00% |  |
Income tax reserve |  |  | 59 |  |  |  |
Number of plaintiffs | plaintiff | 247 |  |  |  |  |  |
Massena West, NY |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Remediation reserve balance |  |  | $ 171 |  | $ 198 |  |
Accrual for environmental loss contingency |  | $ 25 |  |  |  |  |
Spain |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Income taxes receivable | € |  |  |  |  |  | 29 |
Recurring Costs of Managing Hazardous Substances and Environmental Programs | Maximum |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of cost of goods sold |  |  | 1.00% | 1.00% |  |  |
Alcoa Corporation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Tax agreement, indemnification of ultimate liability, percent |  |  |  |  |  |  | 49.00%
Euro |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Income tax reserve | € |  |  |  | € 53 |  |  |
Euro | Spain |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Income taxes receivable | € |  |  |  |  |  | € 26 |

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