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COMMITMENTS AND GUARANTEES (Community Development Programs) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
PT Freeport Indonesia [Member] |  |  |
Contractual obligations community development programs [line items] |  |  |
Percentage of annual revenue committed for the development of the local people in the area of operations | 1.00%fcx_PercentageOfAnnualRevenueCommittedForDevelopmentOfLocalPeople / fcx_ContractualObligationsCommunityDevelopmentProgramsAxis = fcx_PtFreeportIndonesiaMember |  |
Amount charged to cost of sales for the commitment | $ 31 fcx_AmountChargedToCostOfSalesForCommunityDevelopmentPrograms / fcx_ContractualObligationsCommunityDevelopmentProgramsAxis = fcx_PtFreeportIndonesiaMember | $ 41 fcx_AmountChargedToCostOfSalesForCommunityDevelopmentPrograms / fcx_ContractualObligationsCommunityDevelopmentProgramsAxis = fcx_PtFreeportIndonesiaMember | $ 39 fcx_AmountChargedToCostOfSalesForCommunityDevelopmentPrograms / fcx_ContractualObligationsCommunityDevelopmentProgramsAxis = fcx_PtFreeportIndonesiaMember
Tenke Fungurume [Member] |  |  |
Contractual obligations community development programs [line items] |  |  |
Amount charged to cost of sales for the commitment | $ 4 fcx_AmountChargedToCostOfSalesForCommunityDevelopmentPrograms / fcx_ContractualObligationsCommunityDevelopmentProgramsAxis = fcx_TenkeFungurumeMember | $ 4 fcx_AmountChargedToCostOfSalesForCommunityDevelopmentPrograms / fcx_ContractualObligationsCommunityDevelopmentProgramsAxis = fcx_TenkeFungurumeMember | $ 4 fcx_AmountChargedToCostOfSalesForCommunityDevelopmentPrograms / fcx_ContractualObligationsCommunityDevelopmentProgramsAxis = fcx_TenkeFungurumeMember
Percentage of net sales revenue from production to community development fund to assist the local communities with development of local infrastructure and related services | 0.30%fcx_PercentageOfNetSalesRevenueFromProductionToCommunityDevelopmentFund / fcx_ContractualObligationsCommunityDevelopmentProgramsAxis = fcx_TenkeFungurumeMember |  |

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- Definition The amount charged to cost of sales for the commitment to community development programs. + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | fcx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of annual revenue committed for the development of the local people in the area of operations. + References No definition available. + Details
Name: | fcx_PercentageOfAnnualRevenueCommittedForDevelopmentOfLocalPeople
Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of net sales revenue from production to community development fund to assist the local communities with development of local infrastructure and related services. + References No definition available. + Details
Name: | fcx_PercentageOfNetSalesRevenueFromProductionToCommunityDevelopmentFund
Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | fcx_ContractualObligationsCommunityDevelopmentProgramsAxis=fcx_PtFreeportIndonesiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | fcx_ContractualObligationsCommunityDevelopmentProgramsAxis=fcx_TenkeFungurumeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |