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DISPOSITIONS AND ACQUISITIONS (Morenci) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 21, 2018 | May 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from divestiture, net | $ 350 |  |  |  |
Net gain (loss) on sales of assets |  |  | $ 208 | $ 81 | $ 649
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 (loss) on sales of assets |  | $ 576 |  |  |
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% |  |  |
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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