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PROPERTY, PLANT, EQUIPMENT AND MINING DEVELOPMENT COSTS, NET (Schedule of PPE) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Property, Plant and Equipment [Line Items] |  |
Property, plant, equipment and mining development costs | $ 37,484 us-gaap_PropertyPlantAndEquipmentGross | $ 34,249 us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation, depletion and amortization | (11,264)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (10,207)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant, equipment and mining development costs, net | 26,220 us-gaap_PropertyPlantAndEquipmentNet | 24,042 us-gaap_PropertyPlantAndEquipmentNet
Proven and probable reserves [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant, equipment and mining development costs | 4,651 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcx_ProvenAndProbableReservesMember | 4,651 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcx_ProvenAndProbableReservesMember
Value beyond proven and probable reserves (VBPP) [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant, equipment and mining development costs | 1,042 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcx_ValueBeyondProvenAndProbableReservesMember | 1,044 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcx_ValueBeyondProvenAndProbableReservesMember
Mining development and other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant, equipment and mining development costs | 4,712 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MineDevelopmentMember | 4,335 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MineDevelopmentMember
Buildings and infrastructure [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant, equipment and mining development costs | 5,100 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcx_BuildingsAndInfrastructureMember | 4,334 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcx_BuildingsAndInfrastructureMember
Machinery and equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant, equipment and mining development costs | 11,251 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember | 10,379 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember
Mobile equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant, equipment and mining development costs | 3,926 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_TransportationEquipmentMember | 3,903 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_TransportationEquipmentMember
Construction in progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant, equipment and mining development costs | $ 6,802 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember | $ 5,603 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember

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