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CONTINGENCIES (Financial Assurances) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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New Mexico, Arizona, Colorado and Other States |  |
Guarantor Obligations [Line Items] |  |
Environmental costs associated with closure and reclamation/restoration costs | $ 1,200 |
Guarantee | New Mexico, Arizona, Colorado and Other States |  |
Guarantor Obligations [Line Items] |  |
Environmental costs associated with closure and reclamation/restoration costs | 703 |
Freeport-McMoRan Oil & Gas |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations, carrying value | 614 |
NEW MEXICO |  |
Guarantor Obligations [Line Items] |  |
Legally restricted funds for asset retirement obligations at New Mexico mines | $ 180 | $ 173

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- Definition Carrying amount as of the balance sheet date of the liability for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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