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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Recoverable Reserves) (Details)
Dec. 31, 2014
lb
Copper (pounds) [Member] | North America [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 35,600,000,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_CopperMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 [1]
Copper (pounds) [Member] | South America [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 31,800,000,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_CopperMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_SouthAmericaMember		 [1]
Copper (pounds) [Member] | Indonesia [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 29,000,000,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_CopperMember
/ us-gaap_StatementGeographicalAxis
= country_ID		 [1]
Copper (pounds) [Member] | Africa [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 7,100,000,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_CopperMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AfricaMember		 [1]
Gold (ounces) [Member] | North America [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 300,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_GoldMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
Gold (ounces) [Member] | South America [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 0fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_GoldMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_SouthAmericaMember
Gold (ounces) [Member] | Indonesia [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 28,200,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_GoldMember
/ us-gaap_StatementGeographicalAxis
= country_ID
Gold (ounces) [Member] | Africa [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 0fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_GoldMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AfricaMember
Molybdenum (pounds) [Member] | North America [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 2,420,000,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_MolybdenumMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
Molybdenum (pounds) [Member] | South America [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 690,000,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_MolybdenumMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_SouthAmericaMember
Molybdenum (pounds) [Member] | Indonesia [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 0fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_MolybdenumMember
/ us-gaap_StatementGeographicalAxis
= country_ID
Molybdenum (pounds) [Member] | Africa [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 0fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_MolybdenumMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AfricaMember
Consolidated Basis [Member] | Copper (pounds) [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 103,500,000,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_CopperMember
/ fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis
= fcx_ConsolidatedBasisMember		 [1],[2]
Consolidated Basis [Member] | Gold (ounces) [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 28,500,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_GoldMember
/ fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis
= fcx_ConsolidatedBasisMember		 [2]
Consolidated Basis [Member] | Molybdenum (pounds) [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 3,110,000,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_MolybdenumMember
/ fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis
= fcx_ConsolidatedBasisMember		 [2]
Consolidated Basis [Member] | Cobalt (pounds) [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 850,000,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_CobaltMember
/ fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis
= fcx_ConsolidatedBasisMember
Consolidated Basis [Member] | Silver (ounces) [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 282,900,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_SilverMember
/ fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis
= fcx_ConsolidatedBasisMember
Net Equity Interest [Member] | Copper (pounds) [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 82,800,000,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_CopperMember
/ fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis
= fcx_NetEquityInterestMember		 [1],[3]
Net Equity Interest [Member] | Gold (ounces) [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 25,900,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_GoldMember
/ fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis
= fcx_NetEquityInterestMember		 [3]
Net Equity Interest [Member] | Molybdenum (pounds) [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 2,790,000,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_MolybdenumMember
/ fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis
= fcx_NetEquityInterestMember		 [3]
Net Equity Interest [Member] | Cobalt (pounds) [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 470,000,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_CobaltMember
/ fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis
= fcx_NetEquityInterestMember
Net Equity Interest [Member] | Silver (ounces) [Member]  
Estimated Recoverable Proven and Probable Reserves [Line Items]  
Estimated Recoverable Proven And Probable Reserves 232,400,000fcx_EstimatedRecoverableProvenAndProbableReserves
/ fcx_MineralTypeAxis
= fcx_SilverMember
/ fcx_OreAverageOreGradesAndRecoverableProvenAndProbableReservesByOwnershipBasisAxis
= fcx_NetEquityInterestMember
[1] Consolidated recoverable copper reserves included 3.6 billion pounds in leach stockpiles and 0.9 billion pounds in mill stockpiles.
[2] 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.
[3] 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.