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COMMITMENTS AND GUARANTEES (Special Mining License (IUPK)) (Details) - USD ($) $ in Millions | 12 Months Ended | 21 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 21, 2018
Contractual Obligations Mining Contracts [Line Items] |  |  |  |
Smelter Development Progress, Higher Threshold, Percent | 50.00% |  |  |
Royalty Expense | $ 246 | $ 181 | $ 138 |
Export Duties Expense | 180 | $ 115 | 95 |
Surety Bond |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |
Assurance Bond, Smelter Development | $ 342 |  |  |
PT-FI |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |
Progressive export duty on copper concentrates, lower threshold, percent | 2.50% | 5.00% |  |
Progressive export duty on copper concentrates, higher threshold, percent | 5.00% | 7.50% |  | 7.50%
Progressive export duty on copper concentrates, change, percent |  | 2.50% |  |
Restricted Cash and Cash Equivalents | $ 144 | $ 38 |  |
Smelter Development Progress, Lower Threshold, Percent | 30.00% |  |  |
Smelter Development Progress, Higher Threshold, Percent | 50.00% |  |  |
Royalty Expense | $ 238 | 173 | 131 |
Export Duties Expense | $ 180 | 115 | $ 95 |
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 | $ 126 |  |  |
Other Current Assets | PT-FI |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |
Restricted Cash and Cash Equivalents | $ 7 | $ 22 |  |
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% |  |  |

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