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DISPOSITIONS AND ACQUISITIONS (Morenci) (Details) - USD ($) $ in Millions | Dec. 21, 2018 | Dec. 31, 2019 | May 31, 2016
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Proceeds from divestiture, net | $ 350 |  |
Morenci |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Ownership percentage |  | 72.00% |
Morenci | SMM Morenci Inc. |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Ownership percentage |  |  | 13.00%
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% |

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