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FINANCIAL INSTRUMENTS (Unrealized gains losses) (Details) (Commodity Contract [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Embedded derivatives in provisional sales contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Amounts recorded in Sales [Member] |  |  |  |  |  |
Realized gains (losses): |  |  |  |  |  |
Realized and unrealized gains (losses) | $ (289)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = fcx_EmbeddedDerivativesInProvisionalSalesContractsMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember | [1] | $ (136)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = fcx_EmbeddedDerivativesInProvisionalSalesContractsMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember | [1] | $ 77 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = fcx_EmbeddedDerivativesInProvisionalSalesContractsMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember | [1]
Crude Oil Options [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Freeport-McMoRan Oil & Gas [Member] | Amounts recorded in Sales [Member] |  |  |  |  |  |
Realized gains (losses): |  |  |  |  |  |
Realized and unrealized gains (losses) | 513 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilOptionsMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember | [1] | (344)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilOptionsMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember | [1] | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilOptionsMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember | [1]
Natural Gas Swaps [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Freeport-McMoRan Oil & Gas [Member] | Amounts recorded in Sales [Member] |  |  |  |  |  |
Realized gains (losses): |  |  |  |  |  |
Realized and unrealized gains (losses) | (8)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = fcx_NaturalGasSwapsMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember | [1] | 10 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = fcx_NaturalGasSwapsMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember | [1] | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = fcx_NaturalGasSwapsMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember | [1]
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Amounts recorded in Cost of Sales [Member] |  |  |  |  |  |
Realized gains (losses): |  |  |  |  |  |
Realized and unrealized gains (losses) | (4)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | [2] | 3 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | [2] | 15 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | [2]
Fair Value Hedging [Member] | Copper Futures and Swap Contracts [Member] | Amounts recorded in Sales [Member] |  |  |  |  |  |
Unrealized gains (losses): |  |  |  |  |  |
Derivative financial instruments | (12)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_FmcsCopperFuturesAndSwapContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember |  | 1 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_FmcsCopperFuturesAndSwapContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember |  | 15 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_FmcsCopperFuturesAndSwapContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember |
Hedged item – firm sales commitments | 12 us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_FmcsCopperFuturesAndSwapContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember |  | (1)us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_FmcsCopperFuturesAndSwapContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember |  | (15)us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_FmcsCopperFuturesAndSwapContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember |
Realized gains (losses): |  |  |  |  |  |
Matured derivative financial instruments | $ (9)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = fcx_FmcsCopperFuturesAndSwapContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember |  | $ (17)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = fcx_FmcsCopperFuturesAndSwapContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember |  | $ (2)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = fcx_FmcsCopperFuturesAndSwapContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember |
[1] | Amounts recorded in revenues.
[2] | Amounts recorded in cost of sales as production and delivery costs.

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