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DISPOSITIONS AND ACQUISITIONS (TF Holdings Limited) (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 16, 2016 USD ($) $ / lb | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 15, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Other assets |  | $ 2,270 | $ 1,956 |  |
Net gain on sales of assets |  | $ (81) | (649) | $ (39) |
Freeport Cobalt |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Ownership percentage |  | 56.00% |  |  |
Kisanfu Exploration Project |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Ownership percentage |  | 100.00% |  |  |
Disposed of by Sale, Discontinued Operations | TF Holdings Limited |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Revenues |  | $ 13 | 959 | 1,270 |
Proceeds from divestiture, net | $ 2,650 |  |  |  |
Contingent receivable | 120 |  |  |  |
Discontinued Operation, Change in Contingent Receivable |  | 61 | 13 |  |
Other assets |  | 74 | 13 |  |
Loss on disposal |  |  | 33 |  |
TF Holdings Limited |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Ownership percentage |  |  |  |  | 70.00%
Tenke Fungurume mine | TF Holdings Limited |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Ownership percentage |  |  |  |  | 80.00%
Copper | Disposed of by Sale, Discontinued Operations | TF Holdings Limited |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Contingent receivable | $ 60 |  |  |  |
Contingent consideration, reference threshold, price per barrel (in us dollars per pound) | $ / lb | 3.50 |  |  |  |
Cobalt | Disposed of by Sale, Discontinued Operations | TF Holdings Limited |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Contingent receivable | $ 60 |  |  |  |
Contingent consideration, reference threshold, price per barrel (in us dollars per pound) | $ / lb | 20 |  |  |  |
Eliminations | Disposed of by Sale, Discontinued Operations | TF Holdings Limited |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Revenues |  | $ (13) | $ 157 | $ 114 |

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