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CONTINGENCIES (Financial Assurances) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Freeport-McMoRan Oil & Gas |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations, carrying value | $ 481 |
NEW MEXICO |  |
Guarantor Obligations [Line Items] |  |
Legally restricted funds for asset retirement obligations at New Mexico mines | 196 | $ 180
New Mexico, Arizona, Colorado and Other States |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations, carrying value | 1,300 |
New Mexico, Arizona, Colorado and Other States | Guarantee |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations, carrying value | $ 822 |

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