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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Ore Reserves) (Details) | Dec. 31, 2014 MT
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Total 100% basis [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 15,316,000,000 fcx_AmountOfOreReserves / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember | [1]
North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Morenci [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 3,923,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_MorenciMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of copper per metric ton | 0.27%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_MorenciMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.00 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_MorenciMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_MorenciMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1],[2]
North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Bagdad [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 1,334,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_BagdadMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of copper per metric ton | 0.32%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_BagdadMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.00 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_BagdadMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1],[2]
Average ore grade of molybdenum per metric ton | 0.02%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_BagdadMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Safford [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 122,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_SaffordMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of copper per metric ton | 0.47%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_SaffordMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.00 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_SaffordMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_SaffordMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Sierrita [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 2,464,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_SierritaMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of copper per metric ton | 0.23%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_SierritaMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.00 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_SierritaMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1],[2]
Average ore grade of molybdenum per metric ton | 0.02%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_SierritaMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Tyrone [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 59,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_TyroneMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of copper per metric ton | 0.32%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_TyroneMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.00 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_TyroneMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_TyroneMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Chino [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 301,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_ChinoMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of copper per metric ton | 0.39%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_ChinoMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.02 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_ChinoMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_ChinoMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1],[2]
North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Miami [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 3,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_MiamiMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of copper per metric ton | 0.58%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_MiamiMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.00 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_MiamiMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_MiamiMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Henderson [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 90,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_HendersonMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of copper per metric ton | 0.00%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_HendersonMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.00 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_HendersonMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of molybdenum per metric ton | 0.17%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_HendersonMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Climax [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 185,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_ClimaxMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of copper per metric ton | 0.00%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_ClimaxMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.00 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_ClimaxMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of molybdenum per metric ton | 0.16%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_ClimaxMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
North America [Member] | Total 100% basis [Member] | Undeveloped [Member] | Cobre [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 71,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_CobreMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of copper per metric ton | 0.37%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_CobreMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.00 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_CobreMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_CobreMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [1]
South America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Cerro Verde [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 3,953,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_CerroVerdeMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [1]
Average ore grade of copper per metric ton | 0.37%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_CerroVerdeMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.00 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_CerroVerdeMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [1]
Average ore grade of molybdenum per metric ton | 0.01%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_CerroVerdeMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [1]
South America [Member] | Total 100% basis [Member] | Developed and producing [Member] | El Abra [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 444,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_ElAbraMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [1]
Average ore grade of copper per metric ton | 0.46%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_ElAbraMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.00 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_ElAbraMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_ElAbraMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [1]
Indonesia [Member] | Total 100% basis [Member] | Developed and producing [Member] | Grasberg open pit [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 179,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_GrasbergOpenPitMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of copper per metric ton | 0.96%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_GrasbergOpenPitMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 1.06 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_GrasbergOpenPitMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_GrasbergOpenPitMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Indonesia [Member] | Total 100% basis [Member] | Developed and producing [Member] | Deep Ore Zone [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 146,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_DeepOreZoneMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of copper per metric ton | 0.54%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_DeepOreZoneMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.69 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_DeepOreZoneMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_DeepOreZoneMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Indonesia [Member] | Total 100% basis [Member] | Developed and producing [Member] | Big Gossan [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 54,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_BigGossanMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of copper per metric ton | 2.26%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_BigGossanMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.99 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_BigGossanMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_BigGossanMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Indonesia [Member] | Total 100% basis [Member] | Undeveloped [Member] | Grasberg block cave [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 1,012,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_GrasbergBlockCaveMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of copper per metric ton | 1.00%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_GrasbergBlockCaveMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.77 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_GrasbergBlockCaveMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_GrasbergBlockCaveMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Indonesia [Member] | Total 100% basis [Member] | Undeveloped [Member] | Kucing Liar [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 406,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_KucingLiarMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of copper per metric ton | 1.25%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_KucingLiarMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 1.07 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_KucingLiarMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_KucingLiarMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Indonesia [Member] | Total 100% basis [Member] | Undeveloped [Member] | Deep Mill Level Zone [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 472,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_DeepMillLevelZoneMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of copper per metric ton | 0.87%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_DeepMillLevelZoneMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.71 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_DeepMillLevelZoneMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_DeepMillLevelZoneMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [1]
Africa [Member] | Total 100% basis [Member] | Developed and producing [Member] | Tenke Fungurume [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Amount of ore reserves (in metric tons of ore) | 98,000,000 fcx_AmountOfOreReserves / dei_EntityByLocationAxis = fcx_TenkeFungurumeMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | [1]
Average ore grade of copper per metric ton | 3.27%fcx_AverageOreGradeOfCopperPerMetricTon / dei_EntityByLocationAxis = fcx_TenkeFungurumeMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | [1]
Average ore grade of gold per metric ton (in grams per metric ton) | 0.00 fcx_AverageOreGradeOfGoldPerMetricTon / dei_EntityByLocationAxis = fcx_TenkeFungurumeMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | [1]
Average ore grade of molybdenum per metric ton | 0.00%fcx_AverageOreGradeOfMolybdenumPerMetricTon / dei_EntityByLocationAxis = fcx_TenkeFungurumeMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | [1]
Copper (pounds) [Member] | Total 100% basis [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 120,100,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember | [3]
Copper (pounds) [Member] | Consolidated Basis [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 103,500,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_ConsolidatedBasisMember | [4],[5]
Copper (pounds) [Member] | Net Equity Interest [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 82,800,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_NetEquityInterestMember | [4],[6]
Copper (pounds) [Member] | North America [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 35,600,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [4]
Copper (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Morenci [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 15,100,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_MorenciMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Copper (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Bagdad [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 7,800,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_BagdadMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Copper (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Safford [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 1,100,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_SaffordMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Copper (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Sierrita [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 10,800,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_SierritaMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Copper (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Tyrone [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 400,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_TyroneMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Copper (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Chino [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 2,200,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_ChinoMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Copper (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Miami [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 100,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_MiamiMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Copper (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Henderson [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_HendersonMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Copper (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Climax [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_ClimaxMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Copper (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Undeveloped [Member] | Cobre [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 300,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_CobreMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Copper (pounds) [Member] | South America [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 31,800,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [4]
Copper (pounds) [Member] | South America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Cerro Verde [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 28,900,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_CerroVerdeMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [3]
Copper (pounds) [Member] | South America [Member] | Total 100% basis [Member] | Developed and producing [Member] | El Abra [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 2,900,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_ElAbraMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [3]
Copper (pounds) [Member] | Indonesia [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 29,000,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / us-gaap_StatementGeographicalAxis = country_ID | [4]
Copper (pounds) [Member] | Indonesia [Member] | Total 100% basis [Member] | Developed and producing [Member] | Grasberg open pit [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 3,200,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_GrasbergOpenPitMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Copper (pounds) [Member] | Indonesia [Member] | Total 100% basis [Member] | Developed and producing [Member] | Deep Ore Zone [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 1,500,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_DeepOreZoneMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Copper (pounds) [Member] | Indonesia [Member] | Total 100% basis [Member] | Developed and producing [Member] | Big Gossan [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 2,400,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_BigGossanMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Copper (pounds) [Member] | Indonesia [Member] | Total 100% basis [Member] | Undeveloped [Member] | Grasberg block cave [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 18,900,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_GrasbergBlockCaveMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Copper (pounds) [Member] | Indonesia [Member] | Total 100% basis [Member] | Undeveloped [Member] | Kucing Liar [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 9,500,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_KucingLiarMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Copper (pounds) [Member] | Indonesia [Member] | Total 100% basis [Member] | Undeveloped [Member] | Deep Mill Level Zone [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 7,900,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_DeepMillLevelZoneMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Copper (pounds) [Member] | Africa [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 7,100,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_CopperMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | [4]
Copper (pounds) [Member] | Africa [Member] | Total 100% basis [Member] | Developed and producing [Member] | Tenke Fungurume [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 7,100,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_TenkeFungurumeMember / fcx_MineralTypeAxis = fcx_CopperMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | [3]
Gold (ounces) [Member] | Total 100% basis [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 40,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember | [3]
Gold (ounces) [Member] | Consolidated Basis [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 28,500,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_ConsolidatedBasisMember | [5]
Gold (ounces) [Member] | Net Equity Interest [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 25,900,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_NetEquityInterestMember | [6]
Gold (ounces) [Member] | North America [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 300,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember |
Gold (ounces) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Morenci [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_MorenciMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Gold (ounces) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Bagdad [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 100,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_BagdadMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Gold (ounces) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Safford [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_SaffordMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Gold (ounces) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Sierrita [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 100,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_SierritaMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Gold (ounces) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Tyrone [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_TyroneMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Gold (ounces) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Chino [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 100,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_ChinoMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Gold (ounces) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Miami [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_MiamiMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Gold (ounces) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Henderson [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_HendersonMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Gold (ounces) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Climax [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_ClimaxMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Gold (ounces) [Member] | North America [Member] | Total 100% basis [Member] | Undeveloped [Member] | Cobre [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_CobreMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Gold (ounces) [Member] | South America [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember |
Gold (ounces) [Member] | South America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Cerro Verde [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_CerroVerdeMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [3]
Gold (ounces) [Member] | South America [Member] | Total 100% basis [Member] | Developed and producing [Member] | El Abra [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_ElAbraMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [3]
Gold (ounces) [Member] | Indonesia [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 28,200,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / us-gaap_StatementGeographicalAxis = country_ID |
Gold (ounces) [Member] | Indonesia [Member] | Total 100% basis [Member] | Developed and producing [Member] | Grasberg open pit [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 4,900,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_GrasbergOpenPitMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Gold (ounces) [Member] | Indonesia [Member] | Total 100% basis [Member] | Developed and producing [Member] | Deep Ore Zone [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 2,500,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_DeepOreZoneMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Gold (ounces) [Member] | Indonesia [Member] | Total 100% basis [Member] | Developed and producing [Member] | Big Gossan [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 1,100,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_BigGossanMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Gold (ounces) [Member] | Indonesia [Member] | Total 100% basis [Member] | Undeveloped [Member] | Grasberg block cave [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 16,300,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_GrasbergBlockCaveMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Gold (ounces) [Member] | Indonesia [Member] | Total 100% basis [Member] | Undeveloped [Member] | Kucing Liar [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 6,300,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_KucingLiarMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Gold (ounces) [Member] | Indonesia [Member] | Total 100% basis [Member] | Undeveloped [Member] | Deep Mill Level Zone [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 8,600,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_DeepMillLevelZoneMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Gold (ounces) [Member] | Africa [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_GoldMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember |
Gold (ounces) [Member] | Africa [Member] | Total 100% basis [Member] | Developed and producing [Member] | Tenke Fungurume [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_TenkeFungurumeMember / fcx_MineralTypeAxis = fcx_GoldMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | [3]
Molybdenum (pounds) [Member] | Total 100% basis [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 3,130,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember | [3]
Molybdenum (pounds) [Member] | Consolidated Basis [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 3,110,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_ConsolidatedBasisMember | [5]
Molybdenum (pounds) [Member] | Net Equity Interest [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 2,790,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_NetEquityInterestMember | [6]
Molybdenum (pounds) [Member] | North America [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 2,420,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember |
Molybdenum (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Morenci [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 170,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_MorenciMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Molybdenum (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Bagdad [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 380,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_BagdadMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Molybdenum (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Safford [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_SaffordMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Molybdenum (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Sierrita [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 1,010,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_SierritaMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Molybdenum (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Tyrone [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_TyroneMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Molybdenum (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Chino [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 10,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_ChinoMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Molybdenum (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Miami [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_MiamiMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Molybdenum (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Henderson [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 280,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_HendersonMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Molybdenum (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Climax [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 590,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_ClimaxMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Molybdenum (pounds) [Member] | North America [Member] | Total 100% basis [Member] | Undeveloped [Member] | Cobre [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_CobreMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | [3]
Molybdenum (pounds) [Member] | South America [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 690,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember |
Molybdenum (pounds) [Member] | South America [Member] | Total 100% basis [Member] | Developed and producing [Member] | Cerro Verde [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 690,000,000 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_CerroVerdeMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [3]
Molybdenum (pounds) [Member] | South America [Member] | Total 100% basis [Member] | Developed and producing [Member] | El Abra [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_ElAbraMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_SouthAmericaMember | [3]
Molybdenum (pounds) [Member] | Indonesia [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / us-gaap_StatementGeographicalAxis = country_ID |
Molybdenum (pounds) [Member] | Indonesia [Member] | Total 100% basis [Member] | Developed and producing [Member] | Grasberg open pit [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_GrasbergOpenPitMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Molybdenum (pounds) [Member] | Indonesia [Member] | Total 100% basis [Member] | Developed and producing [Member] | Deep Ore Zone [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_DeepOreZoneMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Molybdenum (pounds) [Member] | Indonesia [Member] | Total 100% basis [Member] | Developed and producing [Member] | Big Gossan [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_BigGossanMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Molybdenum (pounds) [Member] | Indonesia [Member] | Total 100% basis [Member] | Undeveloped [Member] | Grasberg block cave [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_GrasbergBlockCaveMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Molybdenum (pounds) [Member] | Indonesia [Member] | Total 100% basis [Member] | Undeveloped [Member] | Kucing Liar [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_KucingLiarMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Molybdenum (pounds) [Member] | Indonesia [Member] | Total 100% basis [Member] | Undeveloped [Member] | Deep Mill Level Zone [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_DeepMillLevelZoneMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_UndevelopedMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = country_ID | [3]
Molybdenum (pounds) [Member] | Africa [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / fcx_MineralTypeAxis = fcx_MolybdenumMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember |
Molybdenum (pounds) [Member] | Africa [Member] | Total 100% basis [Member] | Developed and producing [Member] | Tenke Fungurume [Member] |  |
Ore, average ore grades and recoverable proven and probable reserves [Line Items] |  |
Estimated Recoverable Proven And Probable Reserves | 0 fcx_EstimatedRecoverableProvenAndProbableReserves / dei_EntityByLocationAxis = fcx_TenkeFungurumeMember / fcx_MineralTypeAxis = fcx_MolybdenumMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByMineTypeAxis = fcx_DevelopedAndProducingMember / fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis = fcx_Total100PercentBasisMember / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | [3]
[1] | Excludes material contained in stockpiles.
[2] | Amounts not shown because of rounding.
[3] | Includes estimated recoverable metals contained in stockpiles.
[4] | Consolidated recoverable copper reserves included 3.6 billion pounds in leach stockpiles and 0.9 billion pounds in mill stockpiles.
[5] | Consolidated reserves represent estimated metal quantities after reduction for joint venture partner interests at the Morenci mine in North America and the Grasberg minerals district in Indonesia. Excluded from the table above were FCX’s estimated recoverable proven and probable reserves of 0.85 billion pounds of cobalt at Tenke and 282.9 million ounces of silver in Indonesia, South America and North America, which were determined using long-term average prices of $10 per pound for cobalt and $15 per ounce for silver.
[6] | Net equity interest reserves represent estimated consolidated metal quantities further reduced for noncontrolling interest ownership. Excluded from the table above were FCX’s estimated recoverable proven and probable reserves of 0.47 billion pounds of cobalt at Tenke and 232.4 million ounces of silver in Indonesia, South America and North America.

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