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Contingencies and Commitments (Details) € in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 06, 2019 plaintiff | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) location | Sep. 30, 2019 EUR (€) location | Sep. 30, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Nov. 01, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of cleanup locations | location |  |  |  | 100 | 100 |  |  |
Remediation reserve balance |  | $ 253 |  | $ 253 |  |  | $ 266 |
Remediation reserve balance, classified as a current liability |  | 88 |  | 88 |  |  | 81 |
Payments related to remediation expenses applied against the reserve |  | 22 |  | 38 |  |  |  |
umber of plaintiffs | plaintiff | 247 |  |  |  |  |  |  |
Income tax examination assessment outstanding |  | 166 |  | 166 |  | € 152 |  |
Guarantees of third party related to project financing |  | 31 |  | 31 |  |  |  |
Total amount committed under outstanding surety bonds |  | 49 |  | 49 |  |  |  |
Bank Loan Obligations |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Letters of credit, total amount |  | 146 |  | 146 |  |  |  |
Separation Agreement |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total amount committed under outstanding surety bonds |  | 24 |  | 24 |  |  |  |
Other Noncurrent Liabilities and Deferred Credits |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Combined fair value of guarantees |  | 8 |  | 8 |  |  | 6 |
Other Noncurrent Liabilities and Deferred Credits | Separation Agreement |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Guarantees of third party related to project financing |  | 1,265 |  | 1,265 |  |  | 1,087 |
Massena West, NY |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Remediation reserve balance |  | 191 |  | 191 |  |  | $ 198 |
Increase in accrual for environmental loss contingency |  |  | $ 25 |  |  |  |  |
Spain |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Established tax reserve |  |  |  | 58 | € 53 |  |  |
Tax indemnification receivable |  | $ 28 |  | $ 28 |  | € 26 |  |
Alcoa Corporation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Tax agreement, indemnification of ultimate liability, percent |  | 49.00% |  | 49.00% |  | 49.00% |  |
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 Workers Compensation Claims |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Letters of credit, total amount outstanding |  |  |  |  |  |  |  | $ 52

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