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Contingencies and Commitments (Details) € in Millions, $ in Millions |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 06, 2019 plaintiff | Mar. 31, 2020 USD ($) location | Mar. 31, 2020 EUR (€) location | Mar. 31, 2020 EUR (€) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Nov. 01, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of cleanup locations | location |  | 100 | 100 |  |  |  |
Remediation reserve balance |  |  |  |  | $ 230 | $ 229 |
Remediation reserve balance, classified as a current liability |  |  |  |  | 94 | 93 |
Payments related to remediation expenses applied against the reserve |  | $ 2 |  |  |  |  |
Income tax examination assessment outstanding |  | 170 |  | € 154 |  |  |
Income tax reserve |  | 59 | € 53 |  |  |  |
Tax indemnification receivable |  | 29 |  | € 26 |  |  |
Number of plaintiffs | plaintiff | 247 |  |  |  |  |  |
Guarantees of third party related to project financing |  | 27 |  |  |  |  |
Combined fair value of guarantees |  | 10 |  |  |  | 9 |
Total amount committed under outstanding surety bonds |  | 64 |  |  |  |  |
Surety bonds, amount outstanding |  | 27 |  |  |  |  |
Bank Loan Obligations |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Letters of credit, total amount |  | 138 |  |  |  |  |
Other Noncurrent Liabilities and Deferred Credits | Separation Agreement |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Guarantees of third party related to project financing |  | $ 882 |  |  | 1,353 |  |
Massena West, NY |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Remediation reserve balance |  |  |  |  | $ 171 | $ 169 |
Alcoa Corporation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Tax agreement, indemnification of ultimate liability (percent) |  | 49.00% |  | 49.00% |  |  |
Recurring Costs of Managing Hazardous Substances and Environmental Programs | Maximum |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of cost of goods sold (percent) |  | 1.00% | 1.00% |  |  |  |
Alcoa Corporation Workers Compensation Claims |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Letters of credit, total amount outstanding |  |  |  |  |  |  | $ 54

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