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INCOME TAXES (Details) (USD $) | 3 Months Ended | 7 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 10 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 31, 2012 | Dec. 31, 2019 | Nov. 03, 2014
Income before income taxes and equity in affiliated companies' net earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  |  |  |  |  |  | $ (2,997,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic |  | $ 1,104,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic |  | $ 1,539,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic |  |  |  |
Foreign |  |  |  |  |  |  | 2,573,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign |  | 3,809,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign |  | 3,948,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign |  |  |  |
Total |  |  |  |  |  |  | (424,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 4,913,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 5,487,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  |  |  |
Current income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  | 281,000,000 us-gaap_CurrentFederalTaxExpenseBenefit |  | 203,000,000 us-gaap_CurrentFederalTaxExpenseBenefit |  | 238,000,000 us-gaap_CurrentFederalTaxExpenseBenefit |  |  |  |
State |  |  |  |  |  |  | 35,000,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit |  | 9,000,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit |  | 7,000,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit |  |  |  |
Foreign |  |  |  |  |  |  | 1,128,000,000 us-gaap_CurrentForeignTaxExpenseBenefit |  | 1,081,000,000 us-gaap_CurrentForeignTaxExpenseBenefit |  | 1,002,000,000 us-gaap_CurrentForeignTaxExpenseBenefit |  |  |  |
Total current |  |  |  |  |  |  | 1,444,000,000 us-gaap_CurrentIncomeTaxExpenseBenefit |  | 1,293,000,000 us-gaap_CurrentIncomeTaxExpenseBenefit |  | 1,247,000,000 us-gaap_CurrentIncomeTaxExpenseBenefit |  |  |  |
Deferred income taxes (benefits): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  | (606,000,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit |  | 234,000,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit |  | 87,000,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit |  |  |  |
State |  |  |  |  |  |  | (214,000,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit |  | (35,000,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit |  | 18,000,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit |  |  |  |
Foreign |  |  |  |  |  |  | 33,000,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit |  | 346,000,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit |  | 363,000,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit |  |  |  |
Total deferred |  |  |  |  |  |  | (787,000,000)us-gaap_DeferredIncomeTaxExpenseBenefit |  | 545,000,000 us-gaap_DeferredIncomeTaxExpenseBenefit |  | 468,000,000 us-gaap_DeferredIncomeTaxExpenseBenefit |  |  |  |
Adjustments |  |  |  | (16,000,000)fcx_IncomeTaxExpenseBenefitAdjustments | (183,000,000)fcx_IncomeTaxExpenseBenefitAdjustments |  | 0 fcx_IncomeTaxExpenseBenefitAdjustments |  | (199,000,000)fcx_IncomeTaxExpenseBenefitAdjustments | [1] | (205,000,000)fcx_IncomeTaxExpenseBenefitAdjustments | [2],[3] |  |  |
Federal operating loss carryforwards |  |  |  |  |  |  | (333,000,000)us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability | [4] | (164,000,000)us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability | [4] | 0 us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability |  |  |  |
Provision for income taxes |  |  |  |  |  |  | 324,000,000 us-gaap_IncomeTaxExpenseBenefit | [5],[6] | 1,475,000,000 us-gaap_IncomeTaxExpenseBenefit | [7] | 1,510,000,000 us-gaap_IncomeTaxExpenseBenefit | [8] |  |  |
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 |  |  |  |  |  |
Deferred Other Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 16,000,000 us-gaap_DeferredOtherTaxExpenseBenefit |  |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Environmental Matters |  |  |  |  |  |  |  |  | (76,000,000)fcx_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentofDeferredTaxAssetLiabilityEnvironmentalMatters |  |  |  |  |  |
Effective Date, Stability Agreement |  |  |  |  |  |  | Jan. 01, 2014 |  |  |  |  |  |  |  |
Income tax expense (benefit), reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory tax rate |  |  |  |  |  |  | (149,000,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |  | 1,720,000,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |  | 1,920,000,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |  |  |  |
Foreign tax credit limitation |  |  |  |  |  |  | 167,000,000 us-gaap_IncomeTaxReconciliationTaxCreditsForeign |  | 117,000,000 us-gaap_IncomeTaxReconciliationTaxCreditsForeign |  | 110,000,000 us-gaap_IncomeTaxReconciliationTaxCreditsForeign |  |  |  |
Percentage depletion |  |  |  |  |  |  | (263,000,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion | [9] | (223,000,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion |  | (263,000,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion |  |  |  |
Withholding and other impacts on foreign earnings |  |  |  |  |  |  | 161,000,000 us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings |  | 306,000,000 us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings |  | (17,000,000)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings |  |  |  |
Effect of foreign rates different than the U.S. federal statutory rate |  |  |  |  |  |  | (135,000,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |  | (223,000,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |  | (204,000,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |  |  |  |
Valuation allowance on minimum tax credits |  |  |  |  |  |  | 0 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |  | (190,000,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |  | (9,000,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |  |  |  |
Goodwill impairment |  |  |  |  |  |  | 601,000,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses |  | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses |  | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses |  |  |  |
Goodwill transferred to full cost pool |  |  |  |  |  |  | 77,000,000 fcx_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxLiabilitiesAmount |  | 0 fcx_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxLiabilitiesAmount |  | 0 fcx_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxLiabilitiesAmount |  |  |  |
State income taxes |  |  |  |  |  |  | (115,000,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes |  | (43,000,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes |  | 17,000,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes |  |  |  |
Other items, net |  |  |  |  |  |  | (20,000,000)us-gaap_IncomeTaxReconciliationOtherReconcilingItems |  | 11,000,000 us-gaap_IncomeTaxReconciliationOtherReconcilingItems |  | (44,000,000)us-gaap_IncomeTaxReconciliationOtherReconcilingItems |  |  |  |
Provision for income taxes |  |  |  |  |  |  | 324,000,000 us-gaap_IncomeTaxExpenseBenefit | [5],[6] | 1,475,000,000 us-gaap_IncomeTaxExpenseBenefit | [7] | 1,510,000,000 us-gaap_IncomeTaxExpenseBenefit | [8] |  |  |
Effective income tax rate, reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory tax rate |  |  |  |  |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |  |  |
Foreign tax credit limitation |  |  |  |  |  |  | (39.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign |  | 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign |  | 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign |  |  |  |
Percentage depletion |  |  |  |  |  |  | 62.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion |  | (5.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion |  | (5.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion |  |  |  |
Withholding and other impacts on foreign earnings |  |  |  |  |  |  | (38.00%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings |  | 7.00%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings |  |  |  |
Effect of foreign rates different than the U.S. federal statutory rate |  |  |  |  |  |  | 32.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential |  | (5.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential |  | (4.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential |  |  |  |
Valuation allowance on minimum tax credits |  |  |  |  |  |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance |  | (4.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance |  |  |  |
Goodwill impairment |  |  |  |  |  |  | (142.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses |  |  |  |
Goodwill transferred to full cost pool |  |  |  |  |  |  | (18.00%)fcx_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxLiabilitiesPercent |  | 0.00%fcx_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxLiabilitiesPercent |  | 0.00%fcx_EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxLiabilitiesPercent |  |  |  |
State income taxes |  |  |  |  |  | 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 27.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes |  |  |  |
Other items, net |  |  |  |  |  |  | 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments |  |  |  |
Provision for income taxes |  |  |  |  |  |  | (76.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations |  | 30.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations |  | 28.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations |  |  |  |
Tax charge related to change in U.S. federal income tax regulations |  |  |  |  |  |  | (16,000,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther |  |  |  |  |  |  |  |
Total income taxes paid to all jurisdictions |  |  |  |  |  |  | 1,500,000,000 us-gaap_IncomeTaxesPaid |  | 1,300,000,000 us-gaap_IncomeTaxesPaid |  | 1,800,000,000 us-gaap_IncomeTaxesPaid |  |  |  |
Tax refunds received from all jurisdictions |  |  |  |  |  |  | 257,000,000 us-gaap_ProceedsFromIncomeTaxRefunds |  | 270,000,000 us-gaap_ProceedsFromIncomeTaxRefunds |  | 69,000,000 us-gaap_ProceedsFromIncomeTaxRefunds |  |  |  |
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign tax credits | 2,306,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |  |  | 2,144,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |  | 2,144,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 2,306,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |  | 2,144,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |  |  |  |  |  |
Accrued expenses | 1,047,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals |  |  | 1,098,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals |  | 1,098,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 1,047,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals |  | 1,098,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals |  |  |  |  |  |
Minimum tax credits | 737,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax |  |  | 603,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax |  | 603,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 737,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax |  | 603,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax |  |  |  |  |  |
Net operating loss carryforwards | 590,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |  |  | 925,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |  | 925,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | 590,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |  | 925,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |  |  |  |  |  |
Employee benefit plans | 422,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits |  |  | 443,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits |  | 443,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits | 422,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits |  | 443,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits |  |  |  |  |  |
Other | 734,000,000 us-gaap_DeferredTaxAssetsOther |  |  | 557,000,000 us-gaap_DeferredTaxAssetsOther |  | 557,000,000 us-gaap_DeferredTaxAssetsOther | 734,000,000 us-gaap_DeferredTaxAssetsOther |  | 557,000,000 us-gaap_DeferredTaxAssetsOther |  |  |  |  |  |
Deferred tax assets | 5,836,000,000 us-gaap_DeferredTaxAssetsGross |  |  | 5,770,000,000 us-gaap_DeferredTaxAssetsGross |  | 5,770,000,000 us-gaap_DeferredTaxAssetsGross | 5,836,000,000 us-gaap_DeferredTaxAssetsGross |  | 5,770,000,000 us-gaap_DeferredTaxAssetsGross |  |  |  |  |  |
Valuation allowances | (2,434,000,000)us-gaap_DeferredTaxAssetsValuationAllowance |  |  | (2,487,000,000)us-gaap_DeferredTaxAssetsValuationAllowance |  | (2,487,000,000)us-gaap_DeferredTaxAssetsValuationAllowance | (2,434,000,000)us-gaap_DeferredTaxAssetsValuationAllowance |  | (2,487,000,000)us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  |  |  |
Net deferred tax assets | 3,402,000,000 us-gaap_DeferredTaxAssetsNet |  |  | 3,283,000,000 us-gaap_DeferredTaxAssetsNet |  | 3,283,000,000 us-gaap_DeferredTaxAssetsNet | 3,402,000,000 us-gaap_DeferredTaxAssetsNet |  | 3,283,000,000 us-gaap_DeferredTaxAssetsNet |  |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant, equipment and development costs | (5,331,000,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |  |  | (4,887,000,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |  | (4,887,000,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (5,331,000,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |  | (4,887,000,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |  |  |  |  |  |
Oil and gas properties | (3,392,000,000)fcx_DeferredTaxLiabilitiesOilandGasProperties |  |  | (4,708,000,000)fcx_DeferredTaxLiabilitiesOilandGasProperties |  | (4,708,000,000)fcx_DeferredTaxLiabilitiesOilandGasProperties | (3,392,000,000)fcx_DeferredTaxLiabilitiesOilandGasProperties |  | (4,708,000,000)fcx_DeferredTaxLiabilitiesOilandGasProperties |  |  |  |  |  |
Undistributed earnings | (807,000,000)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |  |  | (936,000,000)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |  | (936,000,000)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings | (807,000,000)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |  | (936,000,000)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |  |  |  |  |  |
Other | (185,000,000)us-gaap_DeferredTaxLiabilitiesOther |  |  | (34,000,000)us-gaap_DeferredTaxLiabilitiesOther |  | (34,000,000)us-gaap_DeferredTaxLiabilitiesOther | (185,000,000)us-gaap_DeferredTaxLiabilitiesOther |  | (34,000,000)us-gaap_DeferredTaxLiabilitiesOther |  |  |  |  |  |
Total deferred tax liabilities | (9,715,000,000)us-gaap_DeferredTaxLiabilities |  |  | (10,565,000,000)us-gaap_DeferredTaxLiabilities |  | (10,565,000,000)us-gaap_DeferredTaxLiabilities | (9,715,000,000)us-gaap_DeferredTaxLiabilities |  | (10,565,000,000)us-gaap_DeferredTaxLiabilities |  |  |  |  |  |
Net deferred tax liabilities | (6,313,000,000)us-gaap_DeferredTaxAssetsLiabilitiesNet |  |  | (7,282,000,000)us-gaap_DeferredTaxAssetsLiabilitiesNet |  | (7,282,000,000)us-gaap_DeferredTaxAssetsLiabilitiesNet | (6,313,000,000)us-gaap_DeferredTaxAssetsLiabilitiesNet |  | (7,282,000,000)us-gaap_DeferredTaxAssetsLiabilitiesNet |  |  |  |  |  |
Valuation allowance on deferred tax asset increase (decrease) during period |  |  |  |  |  |  | (53,000,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |  |  |  |  |  |  |
McMoRan Exploration Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes (benefits): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Other Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 69,000,000 us-gaap_DeferredOtherTaxExpenseBenefit / dei_LegalEntityAxis = fcx_McmoranExplorationCoMember |  |  |  |  |  |
Cerro Verde [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes (benefits): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of Stability Agreement |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |
Foreign Income Tax Rate Under Old Stability Agreement |  |  |  |  |  |  |  |  |  |  |  |  | 30.00%fcx_ForeignIncomeTaxRate / dei_LegalEntityAxis = fcx_CerroVerdeMember |  |
Foreign Income Tax Rate Under New Stability Agreegment |  |  |  |  |  |  | 32.00%fcx_ForeignIncomeTaxRateUnderNewStabilityAgreegment / dei_LegalEntityAxis = fcx_CerroVerdeMember |  |  |  |  |  | 32.00%fcx_ForeignIncomeTaxRateUnderNewStabilityAgreegment / dei_LegalEntityAxis = fcx_CerroVerdeMember |  |
Deferred Foreign Income Tax Expense from New Stability Agreement |  |  |  |  |  |  |  |  |  |  | 29,000,000 fcx_DeferredForeignIncomeTaxExpenseFromNewStabilityAgreement / dei_LegalEntityAxis = fcx_CerroVerdeMember |  |  |  |
Deferred Foreign Income Tax Expense (Benefit) Associated with Foreign Reinvested Profits |  |  |  |  |  |  |  |  |  |  | 234,000,000 fcx_DeferredForeignIncomeTaxExpenseBenefitAssociatedWithForeignReinvestedProfits / dei_LegalEntityAxis = fcx_CerroVerdeMember |  |  |  |
Chile [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes (benefits): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  | 54,000,000 fcx_IncomeTaxExpenseBenefitAdjustments / us-gaap_IncomeTaxAuthorityAxis = country_CL |  |  |  |  |  |  |  |
Foreign Income Tax Rate Under Old Stability Agreement |  |  |  |  |  |  | 35.00%fcx_ForeignIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL |  |  |  |  |  |  |  |
Peru [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes (benefits): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  | 24,000,000 fcx_IncomeTaxExpenseBenefitAdjustments / us-gaap_IncomeTaxAuthorityAxis = country_PE |  |  |  |  |  |  |  |
Foreign Income Tax Rate Under Old Stability Agreement |  |  |  |  |  |  | 30.00%fcx_ForeignIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_PE |  |  |  |  |  |  | 26.00%fcx_ForeignIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_PE |
Candelaria and Ojos del Salado Mining Complex [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes and equity in affiliated companies' net earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | 689,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  | 547,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  | 270,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember
Effective income tax rate, reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Tax Provision (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 221,000,000 fcx_SignificantAcquisitionsandDisposalsGainLossonSaleorDisposalTaxProvisionBenefit / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember
[1] | 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.
[2] | 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.
[3] | 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.
[4] | Benefit from the use of federal operating loss carryforwards acquired as part of the oil and gas acquisitions.
[5] | Includes charges related to changes in Chilean and Peruvian tax rules of $54 million and $24 million, respectively.
[6] | Includes a net charge of $221 million related to the sale of Candelaria/Ojos.
[7] | Includes a net tax benefit of $199 million as a result of the oil and gas acquisitions.
[8] | Includes the reversal of Cerro Verde's deferred income tax liability of $234 million.
[9] | Includes a net charge of $16 million related to a change in U.S. federal income tax law.

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