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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 7 Months Ended | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2013
Stockholder's Equity and Stock-based Compensation [Line Items] |  |  |  |  |  |  |  |
Stock Based Compensation Included In General And Administrative Expense | $ 79 fcx_StockBasedCompensationIncludedInGeneralAndAdministrativeExpense |  | $ 145 fcx_StockBasedCompensationIncludedInGeneralAndAdministrativeExpense |  | $ 77 fcx_StockBasedCompensationIncludedInGeneralAndAdministrativeExpense |  |  |
Stock Based Compensation Included In Production and Delivery Expense | 28 fcx_StockBasedCompensationIncludedInProductionandDeliveryExpense |  | 28 fcx_StockBasedCompensationIncludedInProductionandDeliveryExpense |  | 23 fcx_StockBasedCompensationIncludedInProductionandDeliveryExpense |  |  |
Capitalized costs | (23)us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount |  | (13)us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount |  | 0 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount |  |  |
Stock-based compensation | 130 us-gaap_AllocatedShareBasedCompensationExpense |  | 186 us-gaap_AllocatedShareBasedCompensationExpense |  | 100 us-gaap_AllocatedShareBasedCompensationExpense |  |  |
Tax Benefit and Noncontrolling Interests' Share | (42)fcx_TaxBenefitandNoncontrollingInterestsShare |  | (66)fcx_TaxBenefitandNoncontrollingInterestsShare |  | (39)fcx_TaxBenefitandNoncontrollingInterestsShare |  |  |
Impact on net income | 65 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax |  | 107 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax |  | 61 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax |  |  |
Stock appreciation rights outstanding and included in stock options | 1,413,153 fcx_StockAppreciationRightsOutstandingAndIncludedInStockOptions |  |  |  |  |  |  |
Accounts payable and accrued liabilities | 3,653 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent |  | 3,708 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent |  |  |  | 3,708 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent | 3,708 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Share-based Compensation [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period (in number of options/units) | 45,130,661 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  |  |  |  |
Granted (in number of options/units) | 3,276,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |  |  |  |  |  |
Exercised (in number of options/units) | (1,950,130)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |  |
Expired/Forfeited (in number of options/units) | (526,792)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod |  |  |  |  |  |  |
Balance at end of period (in number of options/units) | 45,929,739 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  | 45,130,661 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  | 45,130,661 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 45,130,661 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Stock options, stock appreciation rights, restricted stock units and additional disclosures [Abstract] |  |  |  |  |  |  |  |
Weighted-average exercise price at beginning of period (in dollars per option) | $ 35.39 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  |  |  |  |  |  |
Granted (in dollars per option) | $ 31.01 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice |  |  |  |  |  |  |
Exercised (in dollars per option) | $ 21.23 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice |  |  |  |  |  |  |
Expired/Forfeited (in dollars per option) | $ 37.51 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice |  |  |  |  |  |  |
Weighted-average exercise price at end of period (in dollars per option) | $ 35.65 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  | $ 35.39 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  |  |  | $ 35.39 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 35.39 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted-average remaining contractual term (in years) | 5 years 1 month |  |  |  |  |  |  |
Vested and exercisable at end of period (in options) | 35,062,748 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber |  |  |  |  |  |  |
Weighted-average option price of vested and exercisable (in dollars per option) | $ 35.15 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice |  |  |  |  |  |  |
Aggregate intrinsic value of outstanding | 38 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue |  |  |  |  |  |  |
Weighted-average remaining contractual term of vested and exercisable (in years) | 4 years 2 months |  |  |  |  |  |  |
Aggregate intrinsic value of vested and exercisable | 38 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |  |  |  |  |  |
Fair value assumptions and methodology [Abstract] |  |  |  |  |  |  |  |
Shares tendered to pay exercise price and minimum required taxes (in shares) | 474,480 us-gaap_EmployeeServiceShareBasedCompensationEstimatedQuantityOfSharesToBeRepurchasedInFollowingPeriod | [1] | 3,294,624 us-gaap_EmployeeServiceShareBasedCompensationEstimatedQuantityOfSharesToBeRepurchasedInFollowingPeriod | [1] | 515,558 us-gaap_EmployeeServiceShareBasedCompensationEstimatedQuantityOfSharesToBeRepurchasedInFollowingPeriod | [1] |  |
Cash received from exercise of stock options | 12 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions |  | 8 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions |  | 15 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions |  |  |
Actual tax benefit realized for tax deductions | 16 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions |  | 8 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions |  | 16 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions |  |  |
Amount paid for employee taxes | 8 fcx_AmountPaidForEmployeeTaxesOnExercisedOptions |  | 105 fcx_AmountPaidForEmployeeTaxesOnExercisedOptions |  | 16 fcx_AmountPaidForEmployeeTaxesOnExercisedOptions |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation [Roll Forward] |  |  |  |  |  |  |  |
Granted (in number of options/units) | 344,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |  |  |  |  |
Cash Settled Restricted Stock Units [Member] |  |  |  |  |  |  |  |
Share-based Compensation [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period (in number of options/units) | 2,219,812 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  |  |  |  |
Granted (in number of options/units) | 2,204,986 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  |  |  |  |
Vested (in number of options/units) | (544,048)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  |  |  |  |
Expired/Forfeited (in number of options/units) | (293,186)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  |  |  |  |
Balance at end of period (in number of options/units) | 3,587,564 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  | 2,219,812 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  | 2,219,812 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember | 2,219,812 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember
Stock options, stock appreciation rights, restricted stock units and additional disclosures [Abstract] |  |  |  |  |  |  |  |
Restricted Stock Units - weighted average grant date fair value | $ 30.99 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  | $ 31.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  | $ 31.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember | $ 31.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember
Granted - Weighted Average Grant Date Fair Value | $ 30.95 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  |  |  |  |
Vested - weighted average grant date fair value | $ 31.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  |  |  |  |
Forfeited - weighted average grant date fair value | $ 31.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  |  |  |  |
Weighted-average remaining contractual term (in years) | 1 year 4 months |  |  |  |  |  |  |
Aggregate intrinsic value of outstanding | 84 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  |  |  |  |
Fair value assumptions and methodology [Abstract] |  |  |  |  |  |  |  |
Total grant-date fair value of restricted stock units granted | 68 fcx_RestrictedStockUnitsGrantDateFairValue / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  | 70 fcx_RestrictedStockUnitsGrantDateFairValue / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  |  |
Total intrinsic value of restricted stock units vested | 18 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Stockholder's Equity and Stock-based Compensation [Line Items] |  |  |  |  |  |  |  |
Annual Vesting Percentage Of Options | 33.00%fcx_AnnualVestingPercentageOfOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Share-based Compensation [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period (in number of options/units) | 4,255,476 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Granted (in number of options/units) | 2,161,700 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Vested (in number of options/units) | (436,610)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Expired/Forfeited (in number of options/units) | (175,421)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Balance at end of period (in number of options/units) | 5,805,145 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  | 4,255,476 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  | 4,255,476 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 4,255,476 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Stock options, stock appreciation rights, restricted stock units and additional disclosures [Abstract] |  |  |  |  |  |  |  |
Restricted Stock Units - weighted average grant date fair value | $ 33.57 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  | $ 35.13 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  | $ 35.13 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | $ 35.13 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Granted - Weighted Average Grant Date Fair Value | $ 31.17 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Vested - weighted average grant date fair value | $ 37.93 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Forfeited - weighted average grant date fair value | $ 31.46 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Weighted-average remaining contractual term (in years) | 4 years 8 months 12 days |  |  |  |  |  |  |
Aggregate intrinsic value of outstanding | 128 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Fair value assumptions and methodology [Abstract] |  |  |  |  |  |  |  |
Total grant-date fair value of restricted stock units granted | 67 fcx_RestrictedStockUnitsGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  | 125 fcx_RestrictedStockUnitsGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  | 14 fcx_RestrictedStockUnitsGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |
Total intrinsic value of restricted stock units vested | 15 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  | 12 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  | 28 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |
Total unrecognized compensation cost related to unvested stock options expected to be recognized over a weighted-average period | 41 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Weighted-average period used in calculating unrecognized compensation cost, stock options (in years) | 1 year 7 months |  |  |  |  |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |  |
Stockholder's Equity and Stock-based Compensation [Line Items] |  |  |  |  |  |  |  |
Annual Vesting Percentage Of Options |  |  | 33.00%fcx_AnnualVestingPercentageOfOptions / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |  |  |
Expiration Period Of Options | 5 years |  |  |  |  |  |  |
Fair value assumptions and methodology [Abstract] |  |  |  |  |  |  |  |
Weighted-average expected dividend rate | 4.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |  |  |  |  |
Weighted-average grant-date fair value (in dollars per option) |  |  |  |  |  |  | $ 7.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |
Total intrinsic value of options exercised | 5 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  | 3 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |
Stockholder's Equity and Stock-based Compensation [Line Items] |  |  |  |  |  |  |  |
Annual Vesting Percentage Of Options | 25.00%fcx_AnnualVestingPercentageOfOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |
Expiration Period Of Options | 10 years |  |  |  |  |  |  |
Fair value assumptions and methodology [Abstract] |  |  |  |  |  |  |  |
Weighted-average expected volatility | 36.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 48.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 52.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Expected life of options (in years) | 4 years 11 months 1 day |  | 4 years 7 months 27 days |  | 4 years 6 months 15 days |  |  |
Weighted-average expected dividend rate | 3.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 3.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 3.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Risk free interest rate | 1.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 0.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 0.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Weighted-average grant-date fair value (in dollars per option) | $ 7.43 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | $ 10.98 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | $ 15.60 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Total intrinsic value of options exercised | 17 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 10 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 34 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Fair value of options vested | 76 fcx_ShareBasedCompensationFairValueOfVestedOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 101 fcx_ShareBasedCompensationFairValueOfVestedOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 77 fcx_ShareBasedCompensationFairValueOfVestedOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Total unrecognized compensation cost related to unvested stock options expected to be recognized over a weighted-average period | 48 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |
Weighted-average period used in calculating unrecognized compensation cost, stock options (in years) | 1 year 5 months |  |  |  |  |  |  |
Minimum [Member] | Performance Shares [Member] |  |  |  |  |  |  |  |
Stockholder's Equity and Stock-based Compensation [Line Items] |  |  |  |  |  |  |  |
Performance Share Unit Payout | 0.00%fcx_PerformanceShareUnitPayout / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |
Minimum [Member] | Cash Settled Restricted Stock Units [Member] |  |  |  |  |  |  |  |
Stockholder's Equity and Stock-based Compensation [Line Items] |  |  |  |  |  |  |  |
Expiration Period Of Options | 3 years |  |  |  |  |  |  |
Minimum [Member] | Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |  |
Fair value assumptions and methodology [Abstract] |  |  |  |  |  |  |  |
Weighted-average expected volatility | 30.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |
Expected life of options (in years) | 1 year |  |  |  |  |  |  |
Risk free interest rate | 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Fair value assumptions and methodology [Abstract] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |  |  |  |
Maximum [Member] | Performance Shares [Member] |  |  |  |  |  |  |  |
Stockholder's Equity and Stock-based Compensation [Line Items] |  |  |  |  |  |  |  |
Performance Share Unit Payout | 200.00%fcx_PerformanceShareUnitPayout / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |
Maximum [Member] | Cash Settled Restricted Stock Units [Member] |  |  |  |  |  |  |  |
Stockholder's Equity and Stock-based Compensation [Line Items] |  |  |  |  |  |  |  |
Expiration Period Of Options | 5 years |  |  |  |  |  |  |
Maximum [Member] | Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |  |
Fair value assumptions and methodology [Abstract] |  |  |  |  |  |  |  |
Weighted-average expected volatility | 32.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |
Expected life of options (in years) | 3 years |  |  |  |  |  |  |
Risk free interest rate | 1.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |  |
Stockholder's Equity and Stock-based Compensation [Line Items] |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | 2 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / us-gaap_StatementClassOfStockAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |  |  |  |  |
Cash Settled Restricted Stock Units [Member] |  |  |  |  |  |  |  |
Stockholder's Equity and Stock-based Compensation [Line Items] |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | 28 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / us-gaap_StatementClassOfStockAxis = fcx_CashSettledRestrictedStockUnitsMember |  | 17 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / us-gaap_StatementClassOfStockAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  | 17 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / us-gaap_StatementClassOfStockAxis = fcx_CashSettledRestrictedStockUnitsMember | 17 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / us-gaap_StatementClassOfStockAxis = fcx_CashSettledRestrictedStockUnitsMember
Other Liabilities | 29 us-gaap_OtherLiabilities / us-gaap_StatementClassOfStockAxis = fcx_CashSettledRestrictedStockUnitsMember |  | 19 us-gaap_OtherLiabilities / us-gaap_StatementClassOfStockAxis = fcx_CashSettledRestrictedStockUnitsMember |  |  |  | 19 us-gaap_OtherLiabilities / us-gaap_StatementClassOfStockAxis = fcx_CashSettledRestrictedStockUnitsMember | 19 us-gaap_OtherLiabilities / us-gaap_StatementClassOfStockAxis = fcx_CashSettledRestrictedStockUnitsMember
Employment Restructuring Arrangement [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Stockholder's Equity and Stock-based Compensation [Line Items] |  |  |  |  |  |  |  |
Stock Based Compensation Included In General And Administrative Expense |  |  |  |  |  |  |  | $ 37 fcx_StockBasedCompensationIncludedInGeneralAndAdministrativeExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_StatementEquityComponentsAxis = fcx_EmploymentRestructuringArrangementMember
Share-based Compensation [Roll Forward] |  |  |  |  |  |  |  |
Granted (in number of options/units) |  |  |  |  |  |  |  | 1,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_StatementEquityComponentsAxis = fcx_EmploymentRestructuringArrangementMember
Outside Directors [Member] |  |  |  |  |  |  |  |
Fair value assumptions and methodology [Abstract] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |  |  |  |  |  |
Executive Officers Performance Based [Member] |  |  |  |  |  |  |  |
Stockholder's Equity and Stock-based Compensation [Line Items] |  |  |  |  |  |  |  |
Minimum Five Year Return Required For Restricted Stock Units To Vest Over Three Years |  |  | 6.00%fcx_MinimumFiveYearReturnRequiredForRestrictedStockUnitsToVestOverThreeYears / fcx_StockAwardPlanByPlanAxis = fcx_ExecutiveOfficersPerformanceBasedMember |  |  |  |  |
Fair value assumptions and methodology [Abstract] |  |  |  |  |  |  |  |
Percent Reduction In Restrcited Stock Units If Performance Is Below Level Defined In Agreement |  |  | 20.00%fcx_PercentReductionInRestrcitedStockUnitsIfPerformanceIsBelowLevelDefinedInAgreement / fcx_StockAwardPlanByPlanAxis = fcx_ExecutiveOfficersPerformanceBasedMember |  |  |  |  |
[1] | Under terms of the related plans, upon exercise of stock options and vesting of RSUs, employees may tender existing FCX shares to FCX to pay the exercise price and/or the minimum required taxes.

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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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