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FAIR VALUE MEASUREMENT FAIR VALUE MEASUREMENT (Unobservable inputs) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Asset (Liability) - End of Period $ 99us-gaap_DerivativeLiabilities $ 320us-gaap_DerivativeLiabilities
Deferred Option Premiums and Accrued Interest [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Asset (Liability) - End of Period 210us-gaap_DerivativeLiabilities
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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
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Asset (Liability) - End of Period 0us-gaap_DerivativeLiabilities
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Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Asset (Liability) - Beginning of Period (309)us-gaap_DerivativeLiabilities
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Crude oil options assumed in the PXP acquisition   (83)fcx_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssumedAssetsandLiabilitiesIntoLevel3
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Net realized losses (42)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
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Net unrealized gains included in earnings related to assets still held at the end of the period 430us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
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Net unrealized (gains) losses included in earnings related to liabilities still held at the end of the period   (230)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
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Derivative Asset (Liability) - End of Period 316us-gaap_DerivativeLiabilities
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Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 3 [Member] | Sales [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net realized losses 41us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
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Net unrealized (gains) losses included in earnings related to liabilities still held at the end of the period (432)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
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Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Expense [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net realized losses 1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
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Net unrealized (gains) losses included in earnings related to liabilities still held at the end of the period $ 2us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
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Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 3 [Member] | Minimum [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value Assumptions, Implied Volatility Rate 34.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
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Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 3 [Member] | Maximum [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value Assumptions, Implied Volatility Rate 53.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
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Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value Assumptions, Implied Volatility Rate 39.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
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[1] Recorded at fair value.
[2] Refer to Note 14 for further discussion and balance sheet classifications. Crude oil options were net of $210 million at December 31, 2014, and $444 million at December 31, 2013, for deferred premiums and accrued interest.
[3] Includes net realized losses of $37 million recorded in revenues in 2013 and $41 million in 2014, and $1 million of interest expense associated with deferred premiums in 2013 and 2014.
[4] Includes unrealized losses (gains) of $228 million recorded in revenues in 2013 and $(432) million in 2014, and $2 million of interest expense associated with deferred premiums in 2013 and 2014.