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BUSINESS SEGMENTS (Revenue by Major Customers and Labor Matters) (Details) (USD $) In Billions, unless otherwise specified | 12 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Oct. 06, 2014
Major Customer and Labor Matters [Line Items] |  |  |  |  |
Entity Wide Revenue, Major Customer Threshold, Percent | 10.00%fcx_EntityWideRevenueMajorCustomerThresholdPercent |  |  |  |
Percentage of Employees Covered by Collective Bargaining Agreements | 48.00%fcx_PercentageOfEmployeesCoveredByCollectiveBargainingAgreements |  |  | 48.00%fcx_PercentageOfEmployeesCoveredByCollectiveBargainingAgreements |
Percentage of Employees Covered by Collective Bargaining Agreements that Expire within One Year | 28.00%fcx_PercentageOfEmployeesCoveredByCollectiveBargainingAgreementsThatExpireWithinOneYear |  |  | 28.00%fcx_PercentageOfEmployeesCoveredByCollectiveBargainingAgreementsThatExpireWithinOneYear |
PT Smelting [Member] |  |  |  |  |
Major Customer and Labor Matters [Line Items] |  |  |  |  |
Revenues to major customers | 1.8 us-gaap_Revenues / us-gaap_MajorCustomersAxis = fcx_PtSmeltingMember | $ 1.7 us-gaap_Revenues / us-gaap_MajorCustomersAxis = fcx_PtSmeltingMember | $ 2.1 us-gaap_Revenues / us-gaap_MajorCustomersAxis = fcx_PtSmeltingMember |  |
Percent of revenues to major customers as compared to total consolidated revenues | 8.00%fcx_EntityWideRevenueMajorCustomerAsComparedToTotalConsolidatedRevenuesPercent / us-gaap_MajorCustomersAxis = fcx_PtSmeltingMember | 8.00%fcx_EntityWideRevenueMajorCustomerAsComparedToTotalConsolidatedRevenuesPercent / us-gaap_MajorCustomersAxis = fcx_PtSmeltingMember | 11.00%fcx_EntityWideRevenueMajorCustomerAsComparedToTotalConsolidatedRevenuesPercent / us-gaap_MajorCustomersAxis = fcx_PtSmeltingMember |  |
Phillips 66 [Member] |  |  |  |  |
Major Customer and Labor Matters [Line Items] |  |  |  |  |
Revenues to major customers | 2.5 us-gaap_Revenues / us-gaap_MajorCustomersAxis = fcx_Phillips66Member |  |  |  |
Percent of revenues to major customers as compared to total consolidated revenues | 12.00%fcx_EntityWideRevenueMajorCustomerAsComparedToTotalConsolidatedRevenuesPercent / us-gaap_MajorCustomersAxis = fcx_Phillips66Member |  |  |  |
Candelaria and Ojos del Salado Mining Complex [Member] |  |  |  |  |
Major Customer and Labor Matters [Line Items] |  |  |  |  |
Disposal Date |  |  |  | Nov. 03, 2014 |
Company's direct ownership percentage |  |  |  |  | 80.00%us-gaap_InvestmentOwnedPercentOfNetAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember

X
- Definition Amount of revenue generated from a single external customer reported as a percentage of total consolidated revenues (disclsoure only required if revenues account for 10 percent or more of an entity's revenues). + References No definition available. + Details
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- Definition Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph 2 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.3) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611133-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column D.2) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611225-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph 3 -Article 12 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column D -Article 12 + Details
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