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BUSINESS SEGMENTS (Mine Production and Purchase Percentages) (Details) | 12 Months Ended
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Dec. 31, 2013
Morenci [Member] |
Mining Segment Reporting Information [Line Items] |
Percentage of Division's Copper Production | 39.00%
Cerro Verde [Member] |
Mining Segment Reporting Information [Line Items] |
Percentage of Division's Copper Production | 42.00%
Candelaria [Member] |
Mining Segment Reporting Information [Line Items] |
Percentage of Division's Copper Production | 28.00%
South America [Member] |
Mining Segment Reporting Information [Line Items] |
Percentage of Atlantic Copper's annual concentrate requirements purchased from intercompany | 32.00%
Indonesia [Member] |
Mining Segment Reporting Information [Line Items] |
Percentage of Atlantic Copper's annual concentrate requirements purchased from intercompany | 16.00%
North America Copper Mines Segment [Member] |
Mining Segment Reporting Information [Line Items] |
Percentage of Atlantic Copper's annual concentrate requirements purchased from intercompany | 13.00%
PT Smelting [Member] |
Mining Segment Reporting Information [Line Items] |
Deferred Intercompany Profit, Percentage | 25.00%

X
- 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

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

X
- 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

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