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COMMITMENTS AND GUARANTEES (Special Mining License (IUPK)) (Details) T in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended | 13 Months Ended | 21 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 08, 2020 T | Dec. 21, 2018 | Jan. 01, 2023
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Smelter Development Progress, Higher Threshold, Percent |  | 50.00% |  |  |  |  |
Royalty Expense |  | $ 113 | $ 246 | $ 181 |  |  |
Export Duties Expense |  | 221 | 180 | 115 |  |  |
Surety Bond |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Assurance Bond, Smelter Development |  | $ 344 |  |  |  |  |
PT-FI |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Progressive export duty on copper concentrates, lower threshold, percent |  | 2.50% |  |  |  |  |
Progressive export duty on copper concentrates, higher threshold, percent |  | 5.00% |  |  |  | 7.50% |
Smelter Development Progress, Lower Threshold, Percent |  | 30.00% |  |  |  |  |
Royalty Expense |  | $ 106 | 238 | 173 |  |  |
Export Duties Expense |  | $ 66 | $ 180 | $ 115 |  |  |
PT-FI | Copper |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Royalty Interest in Future Production |  | 4.00% |  |  |  |  |
PT-FI | Gold |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Royalty Interest in Future Production |  | 3.75% |  |  |  |  |
PT-FI | Silver |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Royalty Interest in Future Production |  | 3.25% |  |  |  |  |
PT-FI | Construction Contracts | Surety Bond |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Assurance Bond, Smelter Development |  | $ 157 |  |  |  |  |
PT-FI |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Ownership percentage |  | 48.76% |  |  |  | 81.28% |
PT-FI | PT Indocopper Investama [Member] |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 9.36% |
Tax Authority, In Papua, Indonesia |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Foreign income tax rate under new stability agreement |  | 25.00% |  |  |  |  |
Foreign Profits Tax Rate on Net Income Under New Stability Agreement |  | 10.00% |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Copper Concentrate, Export Quota, Original | T |  |  |  |  | 180 |  |
Copper Concentrate, Export Quota, Revised | T |  |  |  |  | 680 |  |
Forecast [Member] | PT-FI |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 48.76%
Memorandum of Understanding with the Indonesian Government, Indonesia Supreme Court Appeal [Member] | Indonesia Tax Authority | PT-FI |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Progressive export duty on copper concentrates, lower threshold, percent |  | 5.00% |  |  |  |  |
Loss Contingency, Loss in Period | $ 155 | $ 155 |  |  |  |  |
Annual Surface Water Tax Payments [Member] | PT-FI |  |  |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |  |  |
Payments for Other Taxes |  | $ 15 |  |  |  |  |

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