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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Accumulated Other Comprehensive Income) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Accumulated Other Comprehensive Income) [Abstract]        
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax $ (6)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ (5)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ (4)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ (4)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 10us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 10us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 5us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 6us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax (548)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (410)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (507)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (467)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Accumulated other comprehensive loss (544)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (405)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (506)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (465)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Translation adjustments and unrealized losses on securities (1)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [1],[2],[3],[4] (1)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [1],[2],[3] 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax [1],[2],[3],[4]  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax [1],[2],[3],[4] 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax [1],[2],[3] (1)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax [1],[2],[3],[4]  
Other Comprehensive Income (Loss), Pension and Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax, Portion Attributable to Parent (162)fcx_OtherComprehensiveIncomeLossPensionAndPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTaxPortionAttributableToParent [1],[2],[3],[4] 67fcx_OtherComprehensiveIncomeLossPensionAndPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTaxPortionAttributableToParent [1],[2],[3] (66)fcx_OtherComprehensiveIncomeLossPensionAndPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTaxPortionAttributableToParent [1],[2],[3],[4]  
Other Comprehensive Income (Loss), Net of Tax, Amount Attributable to Parent, Before Reclassification Adjustments (163)fcx_OtherComprehensiveIncomeLossNetOfTaxAmountAttributableToParentBeforeReclassificationAdjustments [1],[2],[3],[4] 66fcx_OtherComprehensiveIncomeLossNetOfTaxAmountAttributableToParentBeforeReclassificationAdjustments [1],[2],[3] (67)fcx_OtherComprehensiveIncomeLossNetOfTaxAmountAttributableToParentBeforeReclassificationAdjustments [1],[2],[3],[4]  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [5] 5us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [5] 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax [5]  
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax 24us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [5] 30us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [5] 26us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax [5]  
Other Comprehensive Income (Loss), Net of Tax, Amount Attributable to Parent, Reclassification Adjustments 24fcx_OtherComprehensiveIncomeLossNetOfTaxAmountAttributableToParentReclassificationAdjustments [5] 35fcx_OtherComprehensiveIncomeLossNetOfTaxAmountAttributableToParentReclassificationAdjustments [5] 26fcx_OtherComprehensiveIncomeLossNetOfTaxAmountAttributableToParentReclassificationAdjustments [5]  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax (252)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax 126us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax (106)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax   33us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax 1us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 11us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 3us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Tax 94us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax (37)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax 39us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax  
Other Comprehensive Income (Loss), Valuation Allowance, Deferred Tax Asset, Change in Amount 5fcx_OtherComprehensiveIncomeLossValuationAllowanceDeferredTaxAssetChangeInAmount 0fcx_OtherComprehensiveIncomeLossValuationAllowanceDeferredTaxAssetChangeInAmount 1fcx_OtherComprehensiveIncomeLossValuationAllowanceDeferredTaxAssetChangeInAmount  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, before Reclassification Adjustments, Tax $ 14us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax $ 17us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax $ 15us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax  
[1] Includes foreign exchange gains (losses), net of noncontrolling interest, totaling $3 million for 2012, $11 million for 2013 and $1 million for 2014.
[2] Includes tax benefits (provision) totaling $39 million for 2012, $(37) million for 2013 and $94 million for 2014.
[3] Includes net actuarial (losses) gains, net of noncontrolling interest, totaling $(106) million for 2012, $126 million for 2013 and $(252) million for 2014. The year 2013 also included $33 million for prior service costs.
[4] Includes adjustments to deferred tax valuation allowance of $1 million for 2012 and $5 million for 2014.
[5] Includes amortization primarily related to actuarial losses that were net of taxes of $15 million for 2012, $17 million for 2013 and $14 million for 2014.