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Fair Value Measurement (Unaudited) Unobservable Inputs (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Liability   $ 99us-gaap_DerivativeLiabilities
Derivative Liability 51us-gaap_DerivativeLiabilities 99us-gaap_DerivativeLiabilities
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Liability   0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [1],[2]
Derivative Liability 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [1],[2] 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [1],[2]
Crude Oil Options [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Liability 316us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= fcx_CrudeOilOptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		  
Net realized gains (losses) 3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_DerivativeInstrumentRiskAxis
= fcx_CrudeOilOptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [3]  
Net unrealized gains included in earnings related to assets and liabilities still held at the end of the period 48us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= fcx_CrudeOilOptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		  
Net settlement (receipts) payments (99)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= fcx_CrudeOilOptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [4]  
Derivative Liability 268us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= fcx_CrudeOilOptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		  
Crude Oil Options [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value Assumptions, Implied Volatilities 31.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_DerivativeInstrumentRiskAxis
= fcx_CrudeOilOptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Crude Oil Options [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value Assumptions, Implied Volatilities 56.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_DerivativeInstrumentRiskAxis
= fcx_CrudeOilOptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Crude Oil Options [Member] | Weighted Average [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Deferred Premium Price 6.89fcx_DeferredPremiumPrice
/ us-gaap_DerivativeInstrumentRiskAxis
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/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		  
Crude Oil Options [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value Assumptions, Implied Volatilities 38.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_DerivativeInstrumentRiskAxis
= fcx_CrudeOilOptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		  
Sales [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net realized gains (losses) 4us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_DerivativeInstrumentRiskAxis
= fcx_CrudeOilOptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember		  
Interest Expense [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net realized gains (losses) (1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
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= fcx_CrudeOilOptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		 [3]  
Net settlement (receipts) payments $ (1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= fcx_CrudeOilOptionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		  
[1] Refer to Note 6 for further discussion and balance sheet classifications. Crude oil options are net of $159 million at March 31, 2015, and $210 million at December 31, 2014, for deferred premiums and accrued interest.
[2] Recorded at fair value.
[3] Includes net realized gains of $4 million, partially offset by $1 million of interest expense associated with the deferred premiums.
[4] Includes interest payments of $1 million.