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CONTINGENCIES (Financial Assurances) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Freeport-McMoRan Oil & Gas |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations, carrying value | $ 545 |
NEW MEXICO |  |
Guarantor Obligations [Line Items] |  |
Legally restricted funds for asset retirement obligations at New Mexico mines | 180 | $ 180
New Mexico, Arizona, Colorado and Other States |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations, carrying value | 1,200 |
New Mexico, Arizona, Colorado and Other States | Guarantee |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations, carrying value | $ 703 |

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