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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) (USD $) | 3 Months Ended | 7 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 5,235,000,000 us-gaap_SalesRevenueNet | [1] | $ 5,696,000,000 us-gaap_SalesRevenueNet | [1] | $ 5,522,000,000 us-gaap_SalesRevenueNet | [1] | $ 4,985,000,000 us-gaap_SalesRevenueNet | [1] | $ 5,885,000,000 us-gaap_SalesRevenueNet | [2] | $ 6,165,000,000 us-gaap_SalesRevenueNet | [2] | $ 4,288,000,000 us-gaap_SalesRevenueNet | [2] | $ 4,583,000,000 us-gaap_SalesRevenueNet |  |  | $ 21,438,000,000 us-gaap_SalesRevenueNet | [1],[3] | $ 20,921,000,000 us-gaap_SalesRevenueNet | [2],[3] | $ 18,010,000,000 us-gaap_SalesRevenueNet | [3]
Operating income | (3,299,000,000)us-gaap_OperatingIncomeLoss | [4],[5] | 1,132,000,000 us-gaap_OperatingIncomeLoss | [4],[5] | 1,153,000,000 us-gaap_OperatingIncomeLoss |  | 1,111,000,000 us-gaap_OperatingIncomeLoss |  | 1,650,000,000 us-gaap_OperatingIncomeLoss | [6],[7] | 1,707,000,000 us-gaap_OperatingIncomeLoss | [6] | 639,000,000 us-gaap_OperatingIncomeLoss | [6] | 1,355,000,000 us-gaap_OperatingIncomeLoss | [6] |  | 97,000,000 us-gaap_OperatingIncomeLoss | [4],[5] | 5,351,000,000 us-gaap_OperatingIncomeLoss | [6],[7] | 5,814,000,000 us-gaap_OperatingIncomeLoss |
Net (loss) income | (2,735,000,000)us-gaap_ProfitLoss | [8],[9] | 704,000,000 us-gaap_ProfitLoss | [8],[9] | 660,000,000 us-gaap_ProfitLoss | [8],[9] | 626,000,000 us-gaap_ProfitLoss |  | 959,000,000 us-gaap_ProfitLoss | [10] | 1,048,000,000 us-gaap_ProfitLoss |  | 610,000,000 us-gaap_ProfitLoss | [10] | 824,000,000 us-gaap_ProfitLoss |  |  | (745,000,000)us-gaap_ProfitLoss | [8],[9] | 3,441,000,000 us-gaap_ProfitLoss | [10] | 3,980,000,000 us-gaap_ProfitLoss |
Net Income (Loss) Attributable to Noncontrolling Interests and Preferred Dividends | 117,000,000 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends |  | 152,000,000 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends |  | 178,000,000 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends |  | 116,000,000 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends |  | 252,000,000 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends |  | 227,000,000 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends |  | 128,000,000 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends |  | 176,000,000 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends |  |  | 563,000,000 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends |  | 783,000,000 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends |  |  |
Net income attributable to FCX common stockholders | (2,852,000,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1],[4],[5],[8],[9] | 552,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1],[4],[5],[8],[9] | 482,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1],[8],[9] | 510,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1] | 707,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [10],[11],[2],[6],[7] | 821,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [2],[6] | 482,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [10],[11],[12],[2],[6] | 648,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [11],[6] |  | (1,308,000,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1],[4],[5],[8],[9] | 2,658,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [10],[11],[12],[2],[6],[7] | 3,041,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Basic net (loss) income per share attributable to FCX common stockholders | $ (2.75)us-gaap_EarningsPerShareBasic |  | $ 0.53 us-gaap_EarningsPerShareBasic |  | $ 0.46 us-gaap_EarningsPerShareBasic |  | $ 0.49 us-gaap_EarningsPerShareBasic |  | $ 0.68 us-gaap_EarningsPerShareBasic |  | $ 0.79 us-gaap_EarningsPerShareBasic |  | $ 0.49 us-gaap_EarningsPerShareBasic |  | $ 0.68 us-gaap_EarningsPerShareBasic |  |  | $ (1.26)us-gaap_EarningsPerShareBasic |  | $ 2.65 us-gaap_EarningsPerShareBasic |  | $ 3.20 us-gaap_EarningsPerShareBasic |
Diluted net (loss) income per share attributable to FCX common stockholders | $ (2.75)us-gaap_EarningsPerShareDiluted | [1],[4],[5],[8],[9] | $ 0.53 us-gaap_EarningsPerShareDiluted | [1],[4],[5],[8],[9] | $ 0.46 us-gaap_EarningsPerShareDiluted | [1],[8],[9] | $ 0.49 us-gaap_EarningsPerShareDiluted | [1] | $ 0.68 us-gaap_EarningsPerShareDiluted | [10],[11],[2],[6],[7] | $ 0.79 us-gaap_EarningsPerShareDiluted | [2],[6] | $ 0.49 us-gaap_EarningsPerShareDiluted | [10],[11],[12],[2],[6] | $ 0.68 us-gaap_EarningsPerShareDiluted | [11],[6] |  | $ (1.26)us-gaap_EarningsPerShareDiluted | [1],[4],[5],[8],[9] | $ 2.64 us-gaap_EarningsPerShareDiluted | [10],[11],[12],[2],[6],[7] | $ 3.19 us-gaap_EarningsPerShareDiluted |
Impairment of oil and gas properties | 3,400,000,000 us-gaap_ImpairmentOfOilAndGasProperties |  | 308,000,000 us-gaap_ImpairmentOfOilAndGasProperties |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ImpairmentOfOilAndGasProperties | 3,737,000,000 us-gaap_ImpairmentOfOilAndGasProperties |  | 0 us-gaap_ImpairmentOfOilAndGasProperties |  | 0 us-gaap_ImpairmentOfOilAndGasProperties |
Impairment of Oil and Gas Properties, Net of Tax | 2,100,000,000 fcx_ImpairmentofOilandGasPropertiesNetofTax |  | 192,000,000 fcx_ImpairmentofOilandGasPropertiesNetofTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000,000 fcx_ImpairmentofOilandGasPropertiesNetofTax |  |  |  |  |
Impairment of Oil and Gas Properties, Amount per Share | $ 2.05 fcx_ImpairmentofOilandGasPropertiesAmountperShare |  | $ 0.18 fcx_ImpairmentofOilandGasPropertiesAmountperShare |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.24 fcx_ImpairmentofOilandGasPropertiesAmountperShare |  |  |  |  |
Goodwill impairment | 1,700,000,000 us-gaap_GoodwillImpairmentLoss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,717,000,000 us-gaap_GoodwillImpairmentLoss |  | 0 us-gaap_GoodwillImpairmentLoss |  | 0 us-gaap_GoodwillImpairmentLoss |
Goodwill, Impairment Loss, Amount per Share | $ 1.65 fcx_GoodwillImpairmentLossAmountperShare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.65 fcx_GoodwillImpairmentLossAmountperShare |  |  |  |  |
Gain (Loss) on Disposition of Assets | 671,000,000 us-gaap_GainLossOnDispositionOfAssets1 |  | 46,000,000 us-gaap_GainLossOnDispositionOfAssets1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 717,000,000 us-gaap_GainLossOnDispositionOfAssets1 |  | 0 us-gaap_GainLossOnDispositionOfAssets1 |  | 0 us-gaap_GainLossOnDispositionOfAssets1 |
Gain (Loss) on Disposition of Assets, Net of Tax | 450,000,000 fcx_GainLossonDispositionofAssetsNetofTax |  | 31,000,000 fcx_GainLossonDispositionofAssetsNetofTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 481,000,000 fcx_GainLossonDispositionofAssetsNetofTax |  |  |  |  |
Gain (Loss) on Disposition of Assets, Amount per Share | $ 0.43 fcx_GainLossonDispositionofAssetsAmountperShare |  | $ 0.03 fcx_GainLossonDispositionofAssetsAmountperShare |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.46 fcx_GainLossonDispositionofAssetsAmountperShare |  |  |  |  |
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances | 22,000,000 fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowances |  | 5,000,000 fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowances |  | 57,000,000 fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowances |  |  |  |  |  |  |  |  |  |  |  |  | 84,000,000 fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowances |  | (190,000,000)fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowances |  |  |
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances, Amount Per Share | $ 0.02 fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowancesAmountPerShare |  |  |  | $ 0.06 fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowancesAmountPerShare |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.08 fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowancesAmountPerShare |  |  |  |  |
Income Tax Expense (Benefit) Associated with Changes in Foreign Tax Rates and Certain Tax Elections | (17,000,000)fcx_IncomeTaxExpenseBenefitAssociatedwithChangesinForeignTaxRatesandCertainTaxElections |  | 54,000,000 fcx_IncomeTaxExpenseBenefitAssociatedwithChangesinForeignTaxRatesandCertainTaxElections |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,000,000 fcx_IncomeTaxExpenseBenefitAssociatedwithChangesinForeignTaxRatesandCertainTaxElections |  |  |  |  |
Income Tax Expense (Benefit) Associated with Changes in Foreign Tax Rates and Certain Tax Elections, Portion Attributable to Noncontrolling Interest | 11,000,000 fcx_IncomeTaxExpenseBenefitAssociatedWithChangesInForeignTaxRatesAndCertainTaxElectionsPortionAttributableToNoncontrollingInterest |  | 7,000,000 fcx_IncomeTaxExpenseBenefitAssociatedWithChangesInForeignTaxRatesAndCertainTaxElectionsPortionAttributableToNoncontrollingInterest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000 fcx_IncomeTaxExpenseBenefitAssociatedWithChangesInForeignTaxRatesAndCertainTaxElectionsPortionAttributableToNoncontrollingInterest |  |  |  |  |
Income Tax Expense (Benefit) Associated with Changes in Foreign Tax Rates and Certain Tax Elections, Net of Noncontrolling Interest | (28,000,000)fcx_IncomeTaxExpenseBenefitAssociatedWithChangesInForeignTaxRatesAndCertainTaxElectionsNetOfNoncontrollingInterest |  | 47,000,000 fcx_IncomeTaxExpenseBenefitAssociatedWithChangesInForeignTaxRatesAndCertainTaxElectionsNetOfNoncontrollingInterest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,000,000 fcx_IncomeTaxExpenseBenefitAssociatedWithChangesInForeignTaxRatesAndCertainTaxElectionsNetOfNoncontrollingInterest |  |  |  |  |
Income Tax Expense (Benefit) Associated with Changes in Foreign Tax Rates and Certain Tax Elections, Net of Noncontrolling Interest, Per Share | $ (0.03)fcx_IncomeTaxExpenseBenefitAssociatedWithChangesInForeignTaxRatesAndCertainTaxElectionsNetOfNoncontrollingInterestPerShare |  | $ 0.04 fcx_IncomeTaxExpenseBenefitAssociatedWithChangesInForeignTaxRatesAndCertainTaxElectionsNetOfNoncontrollingInterestPerShare |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.02 fcx_IncomeTaxExpenseBenefitAssociatedWithChangesInForeignTaxRatesAndCertainTaxElectionsNetOfNoncontrollingInterestPerShare |  |  |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax | (18,000,000)us-gaap_ExtinguishmentOfDebtGainLossNetOfTax |  | 17,000,000 us-gaap_ExtinguishmentOfDebtGainLossNetOfTax |  | 4,000,000 us-gaap_ExtinguishmentOfDebtGainLossNetOfTax |  |  |  | 7,000,000 us-gaap_ExtinguishmentOfDebtGainLossNetOfTax |  |  |  | 5,000,000 us-gaap_ExtinguishmentOfDebtGainLossNetOfTax |  | (40,000,000)us-gaap_ExtinguishmentOfDebtGainLossNetOfTax |  |  | 3,000,000 us-gaap_ExtinguishmentOfDebtGainLossNetOfTax |  | (28,000,000)us-gaap_ExtinguishmentOfDebtGainLossNetOfTax |  |  |
Extinguishment of Debt, Gain (Loss), Per Share, Net of Tax | $ (0.02)us-gaap_ExtinguishmentOfDebtGainLossPerShareNetOfTax |  | $ 0.02 us-gaap_ExtinguishmentOfDebtGainLossPerShareNetOfTax |  |  |  |  |  | $ 0.01 us-gaap_ExtinguishmentOfDebtGainLossPerShareNetOfTax |  |  |  | $ 0.01 us-gaap_ExtinguishmentOfDebtGainLossPerShareNetOfTax |  | $ (0.04)us-gaap_ExtinguishmentOfDebtGainLossPerShareNetOfTax |  |  |  |  | $ (0.03)us-gaap_ExtinguishmentOfDebtGainLossPerShareNetOfTax |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  | 4,000,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  | 1,000,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  | 61,000,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  | 14,000,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  |  |  | 80,000,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  |
Business Combination, Acquisition Related Costs, Net of Tax |  |  |  |  |  |  |  |  | 3,000,000 fcx_BusinessCombinationAcquisitionRelatedCostsNetOfTax |  | 1,000,000 fcx_BusinessCombinationAcquisitionRelatedCostsNetOfTax |  | 36,000,000 fcx_BusinessCombinationAcquisitionRelatedCostsNetOfTax |  | 10,000,000 fcx_BusinessCombinationAcquisitionRelatedCostsNetOfTax |  |  |  |  | 50,000,000 fcx_BusinessCombinationAcquisitionRelatedCostsNetOfTax |  |  |
Business Combination, Acquisition Related Costs, Net of Tax, Amount Per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.04 fcx_BusinessCombinationAcquisitionRelatedCostsNetOfTaxAmountPerShare |  | $ 0.01 fcx_BusinessCombinationAcquisitionRelatedCostsNetOfTaxAmountPerShare |  |  |  |  | $ 0.05 fcx_BusinessCombinationAcquisitionRelatedCostsNetOfTaxAmountPerShare |  |  |
Inventory Write-down |  |  |  |  |  |  |  |  | 76,000,000 us-gaap_InventoryWriteDown |  |  |  |  |  |  |  |  | 76,000,000 us-gaap_InventoryWriteDown |  | 76,000,000 us-gaap_InventoryWriteDown |  |  |
Inventory Write-down, Effect on Net Income |  |  |  |  |  |  |  |  | 49,000,000 fcx_InventoryWritedownEffectonNetIncome |  |  |  |  |  |  |  |  |  |  | 49,000,000 fcx_InventoryWritedownEffectonNetIncome |  |  |
Inventory Write-down, Amount Per Share |  |  |  |  |  |  |  |  | $ 0.05 fcx_InventoryWritedownAmountPerShare |  |  |  |  |  |  |  |  |  |  | $ 0.05 fcx_InventoryWritedownAmountPerShare |  |  |
Executive Employment Agreement Costs |  |  |  |  |  |  |  |  | 37,000,000 fcx_ExecutiveEmploymentAgreementCosts |  |  |  |  |  |  |  |  |  |  | 37,000,000 fcx_ExecutiveEmploymentAgreementCosts |  |  |
Executive Employment Agreement Costs, Net of Tax |  |  |  |  |  |  |  |  | 23,000,000 fcx_ExecutiveEmploymentAgreementCostsNetofTax |  |  |  |  |  |  |  |  |  |  | 23,000,000 fcx_ExecutiveEmploymentAgreementCostsNetofTax |  |  |
Executive Employment Agreement Costs, Amount Per Share |  |  |  |  |  |  |  |  | $ 0.02 fcx_ExecutiveEmploymentAgreementCostsAmountPerShare |  |  |  |  |  |  |  |  |  |  | $ 0.02 fcx_ExecutiveEmploymentAgreementCostsAmountPerShare |  |  |
Income Tax Expense (Benefit) Adjustments |  |  |  |  |  |  |  |  | 16,000,000 fcx_IncomeTaxExpenseBenefitAdjustments |  |  |  | 183,000,000 fcx_IncomeTaxExpenseBenefitAdjustments |  |  |  |  | 0 fcx_IncomeTaxExpenseBenefitAdjustments |  | 199,000,000 fcx_IncomeTaxExpenseBenefitAdjustments | [13] | 205,000,000 fcx_IncomeTaxExpenseBenefitAdjustments | [14],[15]
Income Tax Expense (Benefit) Adjustments, Amount per Share |  |  |  |  |  |  |  |  | $ 0.01 fcx_IncomeTaxExpenseBenefitAdjustmentsAmountperShare |  |  |  | $ 0.19 fcx_IncomeTaxExpenseBenefitAdjustmentsAmountperShare |  |  |  |  |  |  | $ 0.20 fcx_IncomeTaxExpenseBenefitAdjustmentsAmountperShare |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain |  | 128,000,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain |  | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain |
Cerro Verde [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charges For New Labor Agreements |  |  |  |  |  |  |  |  | 36,000,000 fcx_ExpenseForNewLaborAgreements / dei_LegalEntityAxis = fcx_CerroVerdeMember |  |  |  |  |  |  |  |  |  |  | 36,000,000 fcx_ExpenseForNewLaborAgreements / dei_LegalEntityAxis = fcx_CerroVerdeMember |  |  |
Charges For New Labor Agreements Effect On Net Income |  |  |  |  |  |  |  |  | 13,000,000 fcx_SigningBonusExpensesForNewLaborAgreementsEffectOnNetIncome / dei_LegalEntityAxis = fcx_CerroVerdeMember |  |  |  |  |  |  |  |  |  |  | 13,000,000 fcx_SigningBonusExpensesForNewLaborAgreementsEffectOnNetIncome / dei_LegalEntityAxis = fcx_CerroVerdeMember |  |  |
Charges For New Labor Agreements Effect on Diluted Earnings Per Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.01 fcx_SigningBonusExpensesForNewLaborAgreementsEffectOnDilutedEarningsPerShare / dei_LegalEntityAxis = fcx_CerroVerdeMember |  |  |  |  |  |  |  |  |  |  | $ 0.01 fcx_SigningBonusExpensesForNewLaborAgreementsEffectOnDilutedEarningsPerShare / dei_LegalEntityAxis = fcx_CerroVerdeMember |  |  |
Crude Oil and Natural Gas Swaps [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized Gain (Loss) on Hedging Instruments | 497,000,000 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | 122,000,000 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | (7,000,000)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | 15,000,000 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | (118,000,000)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | (158,000,000)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | (36,000,000)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  |  |  |  | 627,000,000 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | (312,000,000)us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  |  |
Unrealized Gain (Loss) on Hedging Instruments, Portion Attributable to Parent | 309,000,000 fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetPortionAttributabletoParent / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | 76,000,000 fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetPortionAttributabletoParent / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | (4,000,000)fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetPortionAttributabletoParent / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | 9,000,000 fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetPortionAttributabletoParent / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | (73,000,000)fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetPortionAttributabletoParent / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | (98,000,000)fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetPortionAttributabletoParent / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | (23,000,000)fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetPortionAttributabletoParent / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  |  |  |  | 389,000,000 fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetPortionAttributabletoParent / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | (194,000,000)fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetPortionAttributabletoParent / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  |  |
Unrealized Gain (Loss) on Hedging Instruments, Amount Per Share | $ 0.30 fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetAmountPerShare / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | $ 0.07 fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetAmountPerShare / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  |  |  | $ 0.01 fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetAmountPerShare / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | $ (0.07)fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetAmountPerShare / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | $ (0.09)fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetAmountPerShare / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | $ (0.02)fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetAmountPerShare / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  |  |  |  | $ 0.37 fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetAmountPerShare / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  | $ (0.19)fcx_DerivativeInstrumentsNotDesignatedasHedgingInstrumentsGainLossNetAmountPerShare / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilandNaturalGasSwapsMember |  |  |
McMoRan Exploration Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain |  |  |  |  | $ 128,000,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |  |  |  |  |  | $ 128,000,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |  |  |  |  | $ 128,000,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
Business Combination, Step Acquisition, Equity Interest In Acquiree Remeasurement Gain, Amount Per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.13 fcx_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainAmountPerShare / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |  |  |  |  | $ 0.13 fcx_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainAmountPerShare / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
[1] | Includes credits (charges) of $15 million ($9 million to net income attributable to common stockholders or $0.01 per share) in the first quarter, $(7) million ($(4) million to net income attributable to common stockholders) in the second quarter, $122 million ($76 million to net income attributable to common stockholders or $0.07 per share) in the third quarter, $497 million ($309 million to net loss attributable to common stockholders or $0.30 per share) in the fourth quarter and $627 million ($389 million to net loss attributable to common stockholders or $0.37 per share) for the year for net unrealized and noncash realized gains (losses) on crude oil and natural gas derivative contracts.
[2] | Includes charges of $36 million ($23 million to net income attributable to common stockholders or $0.02 per share) in the second quarter, $158 million ($98 million to net income attributable to common stockholders or $0.09 per share) in the third quarter, $118 million ($73 million to net income attributable to common stockholders or $0.07 per share) in the fourth quarter and $312 million ($194 million to net income attributable to common stockholders or $0.19 per share) for the year (reflecting the seven-month period from June 1, 2013, to December 31, 2013) for unrealized and noncash realized losses on crude oil and natural gas derivative contracts.
[3] | Revenues are attributed to countries based on the location of the customer.
[4] | Includes net gains of $46 million ($31 million to net income attributable to common stockholders or $0.03 per share) in third quarter, $671 million ($450 million to net loss attributable to common stockholders or $0.43 per share) in the fourth quarter and $717 million ($481 million to net loss attributable to common stockholders or $0.46 per share) for the year primarily from the sale of the Candelaria and Ojos del Salado copper mining operations in the fourth quarter (refer to Note 2 for further discussion) and the sale of a metals injection molding plant in the third quarter.
[5] | Includes a charge of $308 million ($192 million to net income attributable to common stockholders or $0.18 per share) in the third quarter, $3.4 billion ($2.1 billion to net loss attributable to common stockholders or $2.05 per share) in the fourth quarter and $3.7 billion ($2.3 billion to net loss attributable to common stockholders or $2.24 per share) for the year to reduce the carrying value of oil and gas properties pursuant to full cost accounting rules. Additionally, the fourth quarter and the year includes a goodwill impairment charge of $1.7 billion ($1.65 per share) for the full carrying value of goodwill.
[6] | Includes charges of $14 million ($10 million to net income attributable to common stockholders or $0.01 per share) in the first quarter, $61 million ($36 million to net income attributable to common stockholders or $0.04 per share) in the second quarter, $1 million ($1 million to net income attributable to common stockholders) in the third quarter, $4 million ($3 million to net income attributable to common stockholders) in the fourth quarter and $80 million ($50 million to net income attributable to common stockholders or $0.05 per share) for the year for transaction and related costs principally associated with the acquisitions of PXP and MMR.
[7] | Includes charges in the fourth quarter and for the year of (i) $76 million ($49 million to net income attributable to common stockholders or $0.05 per share) associated with updated mine plans at Morenci that resulted in a loss in recoverable copper in leach stockpiles, (ii) $37 million ($23 million to net income attributable to common stockholders or $0.02 per share) associated with the restructuring of an executive employment arrangement and (iii) $36 million ($13 million to net income attributable to common stockholders or $0.01 per share) associated with a new labor agreement at Cerro Verde.
[8] | Includes a tax charge of $57 million ($0.06 per share) in the second quarter, $5 million in the third quarter, $22 million ($0.02 per share) in the fourth quarter and $84 million ($0.08 per share) for the year associated with deferred taxes recorded in connection with the allocation of goodwill to the sale of the Eagle Ford properties. Additionally, includes a net tax charge (benefit) of $54 million ($7 million attributable to noncontrolling interests and $47 million to net income attributable to common stockholders or $0.04 per share) in the third quarter, $(17) million ($11 million attributable to noncontrolling interests and $(28) million to net loss attributable to common stockholders or $(0.03) per share) in the fourth quarter and $37 million ($18 million attributable to noncontrolling interests and $19 million to net loss attributable to common stockholders or $0.02 per share) for the year associated with changes in Chilean tax rules, U.S. federal income tax regulations and Peruvian tax rules, partially offset by a tax benefit related to changes in U.S. state income tax filing positions.
[9] | Includes net gains (losses) on early extinguishment of debt totaling $4 million in the second quarter, $17 million ($0.02 per share) in the third quarter, $(18) million ($(0.02) per share) in the fourth quarter and $3 million for the year. Refer to Note 8 for further discussion.
[10] | Includes a net tax benefit of $183 million ($0.19 per share) in the second quarter, $16 million ($0.01 per share) in the fourth quarter and $199 million ($0.20 per share) for the year associated with net reductions in FCX's deferred tax liabilities and deferred tax asset valuation allowances related to the acquisitions of PXP and MMR.
[11] | Includes net (losses) gains on early extinguishment of debt totaling $(40) million ($(0.04) per share) in the first quarter, $5 million ($0.01 per share) in the second quarter for an adjustment related to taxes on the first quarter losses, $7 million ($0.01 per share) in the fourth quarter and $(28) million ($(0.03) per share) for the year. Refer to Note 8 for further discussion.
[12] | Includes a gain of $128 million ($0.13 per share) in the second quarter and for the year related to FCX's preferred stock investment in and the subsequent acquisition of MMR. Refer to Note 2 for further discussion.
[13] | As a result of the oil and gas acquisitions, FCX recognized a net tax benefit of $199 million consisting of income tax benefits of $190 million associated with net reductions in FCX's valuation allowances, $69 million related to the release of the deferred tax liability on PXP's investment in MMR common stock and $16 million associated with the revaluation of state deferred tax liabilities, partially offset by income tax expense of $76 million associated with the write off of deferred tax assets related to environmental liabilities.
[14] | Cerro Verde previously recorded deferred Peruvian income tax liabilities for income taxes that would become payable if the reinvested profits used to fund the initial Cerro Verde sulfide expansion were distributed prior to the expiration of Cerro Verde's 1998 stability agreement on December 31, 2013. Because reinvested profits at Cerro Verde were not expected to be distributed prior to December 31, 2013, a net deferred income tax liability of $234 million was reversed and recognized as an income tax benefit in 2012.
[15] | In 2012, Cerro Verde signed a new 15-year mining stability agreement with the Peruvian government, which became effective January 1, 2014. In connection with the new mining stability agreement, Cerro Verde's income tax rate increased from 30 percent to 32 percent, and FCX recognized additional deferred tax expense of $29 million.

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period, net of tax. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period, net of tax, amount per share. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References No definition available. + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination, amount per share. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments, per share. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments, portion attributable to parent. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Selling, general and administrative costs associated with restructuring an executive employment agreement. + References No definition available. + Details
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Period Type: | duration

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- Definition Selling, general and administrative costs associated with restructuring an executive employment agreement, amount per share. + References No definition available. + Details
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- Definition Charges associated with new labor agreements + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee, per share. + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity securities of subsidiaries or equity method investee, net of tax. + References No definition available. + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually and separately recognized, per share. + References No definition available. + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced, per share. + References No definition available. + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced, net of tax. + References No definition available. + Details
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- Definition The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations and associated with changes in foreign tax rates, certain tax elections affect on current and deferred income taxes and changes in valuation allowances. + References No definition available. + Details
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- Definition The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations and associated with changes in foreign tax rates, certain tax elections effect on current and deferred income taxes and changes in valuation allowances, per share. + References No definition available. + Details
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- Definition The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations and associated with changes in foreign tax rates and certain tax elections effect on current and deferred income taxes. + References No definition available. + Details
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- Definition The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations and associated with changes in foreign tax rates and certain tax elections effect on current and deferred income taxes, net of noncontrolling interest. + References No definition available. + Details
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- Definition The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations and associated with changes in foreign tax rates and certain tax elections affect on current and deferred income taxes, net of noncontrolling interest, amount per share. + References No definition available. + Details
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- Definition The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations and associated with changes in foreign tax rates and certain tax elections effect on current and deferred income taxes, portion attributable to noncontrolling interest. + References No definition available. + Details
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- Definition Income tax expense (benefit) related to changes in deferred tax liabilities and deferred tax asset valuation allowances. + References No definition available. + Details
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- Definition Income tax expense (benefit) related to changes in deferred tax liabilities and deferred tax asset valuation allowances, amount per share. + References No definition available. + Details
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- Definition Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions, amount per share. + References No definition available. + Details
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- Definition Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions, effect on net income. + References No definition available. + Details
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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest and the amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders. + References No definition available. + Details
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- Details
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- Definition Signing Bonus Expenses For New Labor Agreements Effect on Diluted Earnings Per Share + References No definition available. + Details
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- Definition Signing Bonus Expenses For New Labor Agreements Effect On Net Income + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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