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BUSINESS SEGMENTS (Mine Production and Purchase Percentages) (Details)
 12 Months Ended
Dec. 31, 2014
Morenci [Member]  
Mining Segment Reporting Information [Line Items]  
Percentage of Division's Copper Production 41.00%fcx_SegmentsCopperProductionPercent
/ us-gaap_StatementBusinessSegmentsAxis
= fcx_MorenciNorthAmericaCopperMinesSegmentsMember
Cerro Verde [Member]  
Mining Segment Reporting Information [Line Items]  
Percentage of Division's Copper Production 43.00%fcx_SegmentsCopperProductionPercent
/ us-gaap_StatementBusinessSegmentsAxis
= fcx_CerroVerdeSouthAmericaSegmentsMember
South America [Member]  
Mining Segment Reporting Information [Line Items]  
Percentage of Atlantic Copper's annual concentrate requirements purchased from intercompany 21.00%fcx_SubsidiaryAnnualConcentrateRequirementsPurchasedFromIntercompany
/ us-gaap_StatementBusinessSegmentsAxis
= fcx_SouthAmericaMinesSegmentMember
Indonesia [Member]  
Mining Segment Reporting Information [Line Items]  
Percentage of Atlantic Copper's annual concentrate requirements purchased from intercompany 8.00%fcx_SubsidiaryAnnualConcentrateRequirementsPurchasedFromIntercompany
/ us-gaap_StatementBusinessSegmentsAxis
= fcx_IndonesiaMember
North America Copper Mines Segment [Member]  
Mining Segment Reporting Information [Line Items]  
Percentage of Atlantic Copper's annual concentrate requirements purchased from intercompany 21.00%fcx_SubsidiaryAnnualConcentrateRequirementsPurchasedFromIntercompany
/ us-gaap_StatementBusinessSegmentsAxis
= fcx_NorthAmericaCopperMinesSegmentMember
PT Smelting [Member]  
Mining Segment Reporting Information [Line Items]  
Deferred Intercompany Profit, Percentage 25.00%fcx_DeferredIntercompanyProfitPercentage
/ dei_LegalEntityAxis
= fcx_PtSmeltingMember