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OTHER LIABILITIES, INCLUDING EMPLOYEE BENEFITS (Target Asset Allocation) (Details) | 12 Months Ended
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Dec. 31, 2014
Alternative Investments [Member] |
Target asset allocation [Line Items] |
Defined benefit plan, target allocation percentage of assets | 10.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / invest_InvestmentAxis = fcx_AlternativeInvestmentsMember
Equity Investments [Member] |
Target asset allocation [Line Items] |
Defined benefit plan, target allocation percentage of assets | 45.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / invest_InvestmentAxis = us-gaap_EquitySecuritiesMember
Fixed Income Investments [Member] |
Target asset allocation [Line Items] |
Defined benefit plan, target allocation percentage of assets | 45.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / invest_InvestmentAxis = us-gaap_FixedIncomeInvestmentsMember

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
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