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COMMITMENTS AND GUARANTEES (Mining Contracts) (Details) T in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) T $ / lb | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 | Jul. 31, 2014
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |
Progressive Export Duty on Copper Concentrates, Change, Percent | 2.50% |  |  |  |
Surety Bond |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |
Assurance Bond, Smelter Development | $ 326 |  |  |  |
PT-FI |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |
Number of Extention Periods Available Under Mining Contract | 2 |  |  |  |
Period For Option To Extend Mining Contract | 10 years |  |  |  |
Gold And Silver Sales Royalty Rate | 1.00% |  |  |  |
Ore Delivery Commitments and Contracts Daily Production, Per Day | T | 0.2 |  |  |  |
Progressive Export Duty on Copper Concentrates, Lower Threshold, Percent | 5.00% |  |  | 5.00% |
Progressive Export Duty on Copper Concentrates, Higher Threshold, Percent | 7.50% |  |  | 7.50% |
Restricted Cash and Cash Equivalents | $ 38 |  |  |  |
Smelter Development Progress, Lower Threshold, Percent | 7.50% |  |  |  |
Smelter Development Progress, Higher Threshold, Percent | 30.00% |  |  |  |
Royalty Expense | $ 173 | $ 131 | $ 114 |  |
Export Duties Expense | $ 115 | $ 95 | $ 109 |  |
Incremental Percent of Undivided Interest Owned by Third Party | 20.64% |  |  |  |
PT-FI | Copper |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |
Royalty Interest in Future Production | 4.00% |  |  |  | 3.50%
PT-FI | Gold and silver [Member] |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |
Royalty Interest in Future Production | 3.75% |  |  |  | 1.00%
PT-FI | Construction Contracts | Surety Bond |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |
Assurance Bond, Smelter Development | $ 115 |  |  |  |
PT-FI | Minimum |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |
Copper Royalty Rate Payable | 1.50% |  |  |  |
Price Of Copper Per Pound | $ / lb | 0.90 |  |  |  |
PT-FI | Maximum |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |
Copper Royalty Rate Payable | 3.50% |  |  |  |
Price Of Copper Per Pound | $ / lb | 1.10 |  |  |  |
Other Current Assets [Member] | PT-FI |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |
Restricted Cash and Cash Equivalents | $ 22 |  |  |  |
Other Noncurrent Assets [Member] | PT-FI |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |
Restricted Cash and Cash Equivalents | $ 16 |  |  |  |
PT-FI |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |
Ownership percentage | 81.28% |  |  |  |
PT-FI | PT Indocopper Investama [Member] |  |  |  |  |
Contractual Obligations Mining Contracts [Line Items] |  |  |  |  |
Ownership percentage | 9.36% |  |  |  |

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