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Contingencies and Commitments (Details) € in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 06, 2019 plaintiff | Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) location | Sep. 30, 2020 EUR (€) location | Sep. 30, 2020 EUR (€) | Dec. 31, 2019 USD ($) | Sep. 30, 2018
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of cleanup locations | location |  |  | 30 | 30 |  |  |
Remediation reserve balance |  | $ 9 | $ 9 |  |  | $ 8 |
Remediation reserve balance, classified as a current liability |  | 4 | 4 |  |  | 3 |
Payments related to remediation expenses applied against the reserve |  | 1 | 1 |  |  |  |
Income tax examination assessment outstanding |  | 181 | 181 |  | € 155 |  |
Income tax reserve |  |  | 63 | € 54 |  |  |
Tax indemnification receivable |  | 52 | 52 |  | € 45 |  |
Number of plaintiffs | plaintiff | 247 |  |  |  |  |  |
Guarantees of third party related to project financing |  | 26 | 26 |  |  |  |
Combined fair value of guarantees |  | 17 | 17 |  |  | 9 |
Total amount committed under outstanding surety bonds |  | 43 | 43 |  |  |  |
Surety bonds, amount outstanding |  | 26 | 26 |  |  |  |
Bank Loan Obligations |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Letters of credit, total amount |  | 105 | 105 |  |  |  |
Other Noncurrent Liabilities and Deferred Credits | Separation Agreement |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Guarantees of third party related to project financing |  | $ 1,183 | $ 1,183 |  |  | $ 1,353 |
Alcoa Corporation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Tax agreement, indemnification of ultimate liability (percent) |  | 49.00% | 49.00% |  | 49.00% |  | 49.00%
Arconic Corporation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Tax agreement, indemnification of ultimate liability (percent) |  | 34.00% | 34.00% |  | 34.00% |  |
Howmet Aerospace |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Tax agreement, indemnification of ultimate liability (percent) |  | 17.00% | 17.00% |  | 17.00% |  |
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 | $ 54 |  |  |  |
Arconic Corporation Environmental Obligations |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Letters of credit, total amount outstanding |  | 29 | 29 |  |  |  |
Arconic Corporation Environmental Obligations | Letters Of Credit, Pending Cancellation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Letters of credit, total amount outstanding |  | $ 13 | $ 13 |  |  |  |

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