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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Details) | 12 Months Ended
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Dec. 31, 2014 | Feb. 20, 2015
California [Member] |  |
Oil and Gas In Process Activities [Line Items] |  |
Total Reserve Volumes Subject to Reference Price Differential Quality Adjustments, Percentage | 39.00%fcx_TotalReserveVolumesSubjecttoReferencePriceDifferentialQualityAdjustmentsPercentage / us-gaap_StatementGeographicalAxis = stpr_CA |
Gulf of Mexico [Member] |  |
Oil and Gas In Process Activities [Line Items] |  |
Total Reserve Volumes Subject to Reference Price Differential Quality Adjustments, Percentage | 35.00%fcx_TotalReserveVolumesSubjecttoReferencePriceDifferentialQualityAdjustmentsPercentage / us-gaap_StatementGeographicalAxis = fcx_GulfofMexicoMember |
Natural Gas [Member] |  |
Oil and Gas In Process Activities [Line Items] |  |
Average Sales Prices | 4.35 us-gaap_AverageSalesPrices / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember |
Crude Oil [Member] |  |
Oil and Gas In Process Activities [Line Items] |  |
Average Sales Prices | 94.99 us-gaap_AverageSalesPrices / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilMember |
Subsequent Event [Member] | Natural Gas [Member] |  |
Oil and Gas In Process Activities [Line Items] |  |
Average Sales Prices |  | 4.04 us-gaap_AverageSalesPrices / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event [Member] | Crude Oil [Member] |  |
Oil and Gas In Process Activities [Line Items] |  |
Average Sales Prices |  | 87.12 us-gaap_AverageSalesPrices / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition The percentage of total reserve volumes subject to reference price differentials due to transportation, refining costs and other quality adjustments. + References No definition available. + Details
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- Definition The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 3 -Subparagraph A + Details
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