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COMMITMENTS AND GUARANTEES (Financial Guarantees) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Morenci [Member] |
Financial guarantees [line items] |
Percentage of undivided interest in the Morenci complex | 85.00%fcx_PercentageOfUndividedInterestOwnedByCompany / dei_LegalEntityAxis = fcx_MorenciMember
Maximum potential payment the company is obligated to make to Sumitomo upon exercise of the put option | $ 354 us-gaap_GuaranteeObligationsMaximumExposure / dei_LegalEntityAxis = fcx_MorenciMember
Sumitomo's Share in Joint Venture [Member] |
Financial guarantees [line items] |
Percentage of undivided interest owned by third party | 15.00%fcx_PercentOfUndividedInterestOwnedByThirdParty / dei_LegalEntityAxis = fcx_SumitomoShareInJointVentureMember

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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