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DISPOSITIONS AND ACQUISITIONS (Morenci) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
May 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net gain on sales of assets |  | $ 81 | $ 649 | $ 39
Morenci |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage | 85.00% |  |  |
Proceeds from divestiture, net | $ 1,000 |  |  |
Net gain on sales of assets | $ 576 |  |  |
Morenci | Sumitomo Metal Mining Co., Ltd. |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage | 15.00% |  |  |
Morenci | SMM Morenci Inc. [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage |  |  | 13.00% |
Morenci |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage |  | 72.00% |  |
Morenci | Sumitomo Metal Mining Co., Ltd. |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage |  | 15.00% |  |
Morenci | SMM Morenci Inc. [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage |  | 13.00% |  |

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