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BUSINESS SEGMENTS (Mine Production and Purchase Percentages) (Details) | 12 Months Ended
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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

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- Definition Percentage of deferred intercompany profit on sales to equity method investee. + References No definition available. + Details
Name: | fcx_DeferredIntercompanyProfitPercentage
Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
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 Percentage of primary division's copper production produced by that mine. + References No definition available. + Details
Name: | fcx_SegmentsCopperProductionPercent
Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of annual concentrate requirements purchased from intercompany sites. + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=fcx_PtSmeltingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=fcx_CerroVerdeSouthAmericaSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=fcx_IndonesiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=fcx_MorenciNorthAmericaCopperMinesSegmentsMember
Namespace Prefix: |
Data Type: | na
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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=fcx_NorthAmericaCopperMinesSegmentMember
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Data Type: | na
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Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=fcx_SouthAmericaMinesSegmentMember
Namespace Prefix: |
Data Type: | na
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Period Type: |