XML 154 R64.htm IDEA: XBRL DOCUMENT
v2.4.1.9

DEBT (Details) (USD $) | 12 Months Ended | 3 Months Ended | 121 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Nov. 30, 2014 | May 31, 2013 | Dec. 31, 2015 | Jun. 03, 2013 | Feb. 14, 2013 | Mar. 07, 2013 | Feb. 28, 2012 | Feb. 27, 2015
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment | $ 226,000,000 us-gaap_LiabilitiesFairValueAdjustment | $ 653,000,000 us-gaap_LiabilitiesFairValueAdjustment |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 18,970,000,000 us-gaap_DebtInstrumentCarryingAmount | 20,706,000,000 us-gaap_DebtInstrumentCarryingAmount |  | 20,706,000,000 us-gaap_DebtInstrumentCarryingAmount |  |  |  |  |  |  |  |
Less current portion of long-term debt and short-term borrownings | (478,000,000)us-gaap_DebtCurrent | (312,000,000)us-gaap_DebtCurrent |  | (312,000,000)us-gaap_DebtCurrent |  |  |  |  |  |  |  |
Long-term debt | 18,492,000,000 us-gaap_LongTermDebtNoncurrent | 20,394,000,000 us-gaap_LongTermDebtNoncurrent |  | 20,394,000,000 us-gaap_LongTermDebtNoncurrent |  |  |  |  |  |  |  |
Payments for Repurchase of Preferred Stock and Preference Stock | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock | 228,000,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock |  |  |  |  |  |  |  |  |
Royalty Trust Units Issued, Conversion of Debt or Equity Instrument |  | 17,700,000 fcx_RoyaltyTrustUnitsIssuedConversionofDebtorEquityInstrument |  |  |  |  |  |  |  |  |  |
Royalty Trust Units, Fair Value Disclosure |  |  |  |  |  |  |  | 31,000,000 fcx_RoyaltyTrustUnitsFairValueDisclosure |  |  |  |
Net gain (loss) on early extinguishment of debt | (73,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt | 35,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | 168,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 478,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 651,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 1,500,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 3,700,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 662,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 11,800,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  |  |  |  |  |  |  |  |  |
Bridge Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on early extinguishment of debt |  | 45,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_BridgeLoanMember |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  | 9,500,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_BridgeLoanMember |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount | 45,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Remaining Borrowing Capacity | 4,000,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity available for letters of credit at period end | 1,455,000,000 fcx_LineOfCreditFacilityRemainingBorrowingCapacityAvailableForLettersOfCredit / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 474,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.29%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |  |  |  |
Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 3,050,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember | 4,000,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember |  | 4,000,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  | 750,000,000 us-gaap_RepaymentsOfDebt / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember |  |  |  |  |  |  |
Debt Instrument, Face Amount | 4,000,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember |  |  |  |  |  |  |  | 4,000,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember |  |  |
Debt Instrument Maturity Date | May 31, 2018 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember |  |  |  |  |  |  |  |  |  |  |
Term of Debt Agreement |  |  |  | 5 years |  |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 650,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 200,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 2,200,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | 6,500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |
Proceeds from Issuance of Long-term Debt | 2,970,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 6,400,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 2,970,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |
Net gain (loss) on early extinguishment of debt | 77,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount | 4,208,000,000 fcx_ExtinguishmentofDebtPrincipalAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Purchase Accounting Adjustments | 364,000,000 fcx_ExtinguishmentofDebtPurchaseAccountingAdjustments / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 4,572,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Other debt (including equipment capital leases and short-term borrowings) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 115,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 158,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  | 158,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  |  |  |  |  |  |  |
Revolving Credit Facility, Maximum Borrowing Capacity | 4,000,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain | 3,000,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  | 3,000,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  |  |  |  |  |  |  |
Revolving Credit Facility, Expiration Date | May 31, 2019 |  |  |  |  |  |  |  |  |  |  |
Amount of revolving credit facility available to PT Freeport Indonesia | 500,000,000 fcx_AmountOfRevolvingCreditFacilityAvailableToSubsidiary / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on early extinguishment of debt | (4,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  |  |  |  |  |  |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |  |  |  |  |
1.40% Senior Notes due 2015 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20151Point40PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 500,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20151Point40PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 500,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20151Point40PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20151Point40PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Debt Instrument, Interest Rate, Stated Percentage | 1.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20151Point40PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  | 1.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20151Point40PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Net gain (loss) on early extinguishment of debt | (1,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20151Point40PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount | 500,000,000 fcx_ExtinguishmentofDebtPrincipalAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20151Point40PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Purchase Accounting Adjustments | 0 fcx_ExtinguishmentofDebtPurchaseAccountingAdjustments / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20151Point40PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 500,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20151Point40PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
2.15% Senior Notes due 2017 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 500,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20172Point15PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 500,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20172Point15PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 500,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20172Point15PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20172Point15PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Debt Instrument, Interest Rate, Stated Percentage | 2.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20172Point15PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  | 2.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue20172Point15PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
2.30% Senior Notes due 2017 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 749,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20172point3percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20172point3percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20172point3percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 750,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20172point3percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.30%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20172point3percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
2.375% Senior Notes due March 2018 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 1,500,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A2375SeniorNotesDueMarch2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 1,500,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A2375SeniorNotesDueMarch2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 1,500,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A2375SeniorNotesDueMarch2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 1,500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = fcx_A2375SeniorNotesDueMarch2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A2375SeniorNotesDueMarch2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
3.100% Senior Notes due March 2020 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 1,000,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A3100SeniorNotesDueMarch2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 999,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A3100SeniorNotesDueMarch2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 999,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A3100SeniorNotesDueMarch2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 1,000,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = fcx_A3100SeniorNotesDueMarch2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.10%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A3100SeniorNotesDueMarch2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
4.00% Senior Notes due 2021 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 598,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20214percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20214percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20214percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 600,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20214percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20214percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
3.55% Senior Notes due 2022 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 1,996,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A355SeniorNotesDue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 1,996,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A355SeniorNotesDue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 1,996,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A355SeniorNotesDue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | 2,000,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = fcx_A355SeniorNotesDue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Debt Instrument, Interest Rate, Stated Percentage | 3.55%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A355SeniorNotesDue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  | 3.55%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A355SeniorNotesDue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Debt Instrument, Redemption Period, Start Date | Dec. 01, 2021 |  |  |  |  |  |  |  |  |  |  |
Redemption to Principal Amount, Percent | 100.00%fcx_RedemptiontoPrincipalAmountPercent / us-gaap_DebtInstrumentAxis = fcx_A355SeniorNotesDue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
3.875% Senior Notes due March 2023 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 1,999,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A3875SeniorNotesDueMarch2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 1,999,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A3875SeniorNotesDueMarch2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 1,999,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A3875SeniorNotesDueMarch2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 2,000,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = fcx_A3875SeniorNotesDueMarch2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A3875SeniorNotesDueMarch2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Period, Start Date | Dec. 15, 2022 |  |  |  |  |  |  |  |  |  |  |
Redemption to Principal Amount, Percent | 100.00%fcx_RedemptiontoPrincipalAmountPercent / us-gaap_DebtInstrumentAxis = fcx_A3875SeniorNotesDueMarch2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
4.55% Senior Notes due 2024 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 849,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20244point55percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20244point55percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20244point55percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 850,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20244point55percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.55%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20244point55percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Period, Start Date | Aug. 14, 2024 |  |  |  |  |  |  |  |  |  |  |
Redemption to Principal Amount, Percent | 100.00%fcx_RedemptiontoPrincipalAmountPercent / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20244point55percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
5.40% Senior Notes due 2034 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 796,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20345point4percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20345point4percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20345point4percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 800,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20345point4percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20345point4percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Period, Start Date | May 14, 2034 |  |  |  |  |  |  |  |  |  |  |
Redemption to Principal Amount, Percent | 100.00%fcx_RedemptiontoPrincipalAmountPercent / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesdue20345point4percentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
5.450% Senior Notes due March 2043 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 1,991,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A5450SeniorNotesDueMarch2043Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 1,991,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A5450SeniorNotesDueMarch2043Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 1,991,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A5450SeniorNotesDueMarch2043Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 2,000,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = fcx_A5450SeniorNotesDueMarch2043Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A5450SeniorNotesDueMarch2043Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Period, Start Date | Sep. 15, 2042 |  |  |  |  |  |  |  |  |  |  |
Redemption to Principal Amount, Percent | 100.00%fcx_RedemptiontoPrincipalAmountPercent / us-gaap_DebtInstrumentAxis = fcx_A5450SeniorNotesDueMarch2043Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
6.125% Senior Notes due 2019 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on early extinguishment of debt | (2,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = fcx_A6.125SeniorNotesdue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount | 513,000,000 fcx_ExtinguishmentofDebtPrincipalAmount / us-gaap_DebtInstrumentAxis = fcx_A6.125SeniorNotesdue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Purchase Accounting Adjustments | 40,000,000 fcx_ExtinguishmentofDebtPurchaseAccountingAdjustments / us-gaap_DebtInstrumentAxis = fcx_A6.125SeniorNotesdue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 553,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = fcx_A6.125SeniorNotesdue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
8.625% Senior Notes due 2019 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on early extinguishment of debt | 24,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = fcx_A8.625SeniorNotesdue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount | 400,000,000 fcx_ExtinguishmentofDebtPrincipalAmount / us-gaap_DebtInstrumentAxis = fcx_A8.625SeniorNotesdue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Purchase Accounting Adjustments | 41,000,000 fcx_ExtinguishmentofDebtPurchaseAccountingAdjustments / us-gaap_DebtInstrumentAxis = fcx_A8.625SeniorNotesdue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 441,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = fcx_A8.625SeniorNotesdue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
7.625% Senior Notes due 2020 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on early extinguishment of debt | 14,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = fcx_A7.625SeniorNotesdue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount | 300,000,000 fcx_ExtinguishmentofDebtPrincipalAmount / us-gaap_DebtInstrumentAxis = fcx_A7.625SeniorNotesdue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Purchase Accounting Adjustments | 32,000,000 fcx_ExtinguishmentofDebtPurchaseAccountingAdjustments / us-gaap_DebtInstrumentAxis = fcx_A7.625SeniorNotesdue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 332,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = fcx_A7.625SeniorNotesdue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
6.5% Senior Notes due 2020 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on early extinguishment of debt | 10,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = fcx_A6.5SeniorNotesdue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount | 883,000,000 fcx_ExtinguishmentofDebtPrincipalAmount / us-gaap_DebtInstrumentAxis = fcx_A6.5SeniorNotesdue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Purchase Accounting Adjustments | 79,000,000 fcx_ExtinguishmentofDebtPurchaseAccountingAdjustments / us-gaap_DebtInstrumentAxis = fcx_A6.5SeniorNotesdue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 962,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = fcx_A6.5SeniorNotesdue2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
6.625% Senior Notes due 2021 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on early extinguishment of debt | 3,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = fcx_A6.625SeniorNotesdue2021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount | 339,000,000 fcx_ExtinguishmentofDebtPrincipalAmount / us-gaap_DebtInstrumentAxis = fcx_A6.625SeniorNotesdue2021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Purchase Accounting Adjustments | 31,000,000 fcx_ExtinguishmentofDebtPurchaseAccountingAdjustments / us-gaap_DebtInstrumentAxis = fcx_A6.625SeniorNotesdue2021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 370,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = fcx_A6.625SeniorNotesdue2021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
6.75% Senior Notes due 2022 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on early extinguishment of debt | 8,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = fcx_A6.75SeniorNotesdue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount | 551,000,000 fcx_ExtinguishmentofDebtPrincipalAmount / us-gaap_DebtInstrumentAxis = fcx_A6.75SeniorNotesdue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Purchase Accounting Adjustments | 57,000,000 fcx_ExtinguishmentofDebtPurchaseAccountingAdjustments / us-gaap_DebtInstrumentAxis = fcx_A6.75SeniorNotesdue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 608,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = fcx_A6.75SeniorNotesdue2022Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
6.875% Senior Notes due 2023 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on early extinguishment of debt | 21,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = fcx_A6.875SeniorNotesdue2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount | 722,000,000 fcx_ExtinguishmentofDebtPrincipalAmount / us-gaap_DebtInstrumentAxis = fcx_A6.875SeniorNotesdue2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Purchase Accounting Adjustments | 84,000,000 fcx_ExtinguishmentofDebtPurchaseAccountingAdjustments / us-gaap_DebtInstrumentAxis = fcx_A6.875SeniorNotesdue2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount | 806,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = fcx_A6.875SeniorNotesdue2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
7.125% Debentures due 2027 [Member] | Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_DebenturesDue2027Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |  |  |  |  |  |  |  |  |  |  |
9.5% Senior Notes due 2031 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 9.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue2031Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
6.125% Senior Notes due 2034 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue2034Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
8.375% Senior Notes Due 2017 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |
Redemption to Principal Amount, Percent |  |  | 104.553%fcx_RedemptiontoPrincipalAmountPercent / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |
Net gain (loss) on early extinguishment of debt |  |  | 168,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | 3,000,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |
4% Convertible Senior Notes due 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt, Fair Value Disclosures |  |  |  |  |  |  |  | 306,000,000 us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_DebtInstrumentAxis = fcx_A4ConvertibleSeniorNotesdue2017Member |  |  |  |
Payments for Repurchase of Preferred Stock and Preference Stock |  | 270,000,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_DebtInstrumentAxis = fcx_A4ConvertibleSeniorNotesdue2017Member |  |  |  |  |  |  |  |  |  |
Royalty Trust Units Issued, Conversion of Debt or Equity Instrument |  | 21,000,000 fcx_RoyaltyTrustUnitsIssuedConversionofDebtorEquityInstrument / us-gaap_DebtInstrumentAxis = fcx_A4ConvertibleSeniorNotesdue2017Member |  |  |  |  |  |  |  |  |  |
Royalty Trust Units, Fair Value Disclosure |  |  |  |  |  |  |  | 36,000,000 fcx_RoyaltyTrustUnitsFairValueDisclosure / us-gaap_DebtInstrumentAxis = fcx_A4ConvertibleSeniorNotesdue2017Member |  |  |  |
Cerro Verde [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 425,000,000 us-gaap_DebtInstrumentCarryingAmount / dei_LegalEntityAxis = fcx_CerroVerdeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain | 0 us-gaap_DebtInstrumentCarryingAmount / dei_LegalEntityAxis = fcx_CerroVerdeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  | 0 us-gaap_DebtInstrumentCarryingAmount / dei_LegalEntityAxis = fcx_CerroVerdeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  |  |  |  |  |  |  |
Revolving Credit Facility, Maximum Borrowing Capacity | 1,800,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = fcx_CerroVerdeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Expiration Date | Mar. 10, 2019 |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount | 0 us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = fcx_CerroVerdeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity available for letters of credit at period end | 500,000,000 fcx_LineOfCreditFacilityRemainingBorrowingCapacityAvailableForLettersOfCredit / dei_LegalEntityAxis = fcx_CerroVerdeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.90%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / dei_LegalEntityAxis = fcx_CerroVerdeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 2.07%us-gaap_DebtInstrumentInterestRateEffectivePercentage / dei_LegalEntityAxis = fcx_CerroVerdeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  |  |  |  |  |  |  |  |  |  |
Term of Debt Agreement | 5 years |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Term When Funds Are Available to be Drawn on Debt Agreement | 2 years |  |  |  |  |  |  |  |  |  |  |
McMoRan Exploration Co [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  | 62,000,000 us-gaap_LiabilitiesFairValueAdjustment / dei_LegalEntityAxis = fcx_McmoranExplorationCoMember |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | 558,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = fcx_McmoranExplorationCoMember |  |  |  |
McMoRan Exploration Co [Member] | 11.875% Senior Notes due 2014 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 11.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A11.875SeniorNotesdue2014Member / dei_LegalEntityAxis = fcx_McmoranExplorationCoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on early extinguishment of debt |  | (10,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = fcx_A11.875SeniorNotesdue2014Member / dei_LegalEntityAxis = fcx_McmoranExplorationCoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |
Repayments of Assumed Debt |  | 299,000,000 us-gaap_RepaymentsOfAssumedDebt / us-gaap_DebtInstrumentAxis = fcx_A11.875SeniorNotesdue2014Member / dei_LegalEntityAxis = fcx_McmoranExplorationCoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |
McMoRan Exploration Co [Member] | 4% Convertible Senior Notes due 2017 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A4ConvertibleSeniorNotesdue2017Member / dei_LegalEntityAxis = fcx_McmoranExplorationCoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Plains Exploration & Production Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  | May 31, 2013 |  |  |  |  |  |  |  |  |  |
Plains Exploration & Production Company [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Assumed Debt |  | 3,900,000,000 us-gaap_RepaymentsOfAssumedDebt / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain |  |  |  |  |  |  |  |  |  |
Plains Exploration & Production Company [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  |  |  |  |  | 716,000,000 us-gaap_LiabilitiesFairValueAdjustment / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | 6,400,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |
Plains Exploration & Production Company [Member] | 6.125% Senior Notes due 2019 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 255,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.125SeniorNotesdue2019Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 817,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.125SeniorNotesdue2019Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 817,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.125SeniorNotesdue2019Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A6.125SeniorNotesdue2019Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Expiration or Due Date | Jun. 15, 2016 |  |  |  |  |  |  |  |  |  |  |
Plains Exploration & Production Company [Member] | 8.625% Senior Notes due 2019 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A8.625SeniorNotesdue2019Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 447,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A8.625SeniorNotesdue2019Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 447,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A8.625SeniorNotesdue2019Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A8.625SeniorNotesdue2019Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Plains Exploration & Production Company [Member] | 7.625% Senior Notes due 2020 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A7.625SeniorNotesdue2020Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 336,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A7.625SeniorNotesdue2020Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 336,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A7.625SeniorNotesdue2020Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A7.625SeniorNotesdue2020Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Plains Exploration & Production Company [Member] | 6.5% Senior Notes due 2020 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 670,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.5SeniorNotesdue2020Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 1,647,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.5SeniorNotesdue2020Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 1,647,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.5SeniorNotesdue2020Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A6.5SeniorNotesdue2020Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Expiration or Due Date | Nov. 15, 2015 |  |  |  |  |  |  |  |  |  |  |
Plains Exploration & Production Company [Member] | 6.625% Senior Notes due 2021 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 284,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.625SeniorNotesdue2021Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 659,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.625SeniorNotesdue2021Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 659,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.625SeniorNotesdue2021Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A6.625SeniorNotesdue2021Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Expiration or Due Date | May 01, 2016 |  |  |  |  |  |  |  |  |  |  |
Plains Exploration & Production Company [Member] | 6.75% Senior Notes due 2022 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 493,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.75SeniorNotesdue2022Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 1,111,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.75SeniorNotesdue2022Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 1,111,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.75SeniorNotesdue2022Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A6.75SeniorNotesdue2022Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Expiration or Due Date | Feb. 01, 2017 |  |  |  |  |  |  |  |  |  |  |
Plains Exploration & Production Company [Member] | 6.875% Senior Notes due 2023 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 866,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.875SeniorNotesdue2023Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 1,686,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.875SeniorNotesdue2023Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 1,686,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_A6.875SeniorNotesdue2023Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A6.875SeniorNotesdue2023Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Expiration or Due Date | Feb. 15, 2018 |  |  |  |  |  |  |  |  |  |  |
Plains Exploration & Production Company [Member] | 7.625% Senior Notes due 2018 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fcx_A7.625SeniorNotesdue2018Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |  |
Repayments of Assumed Debt |  | 415,000,000 us-gaap_RepaymentsOfAssumedDebt / us-gaap_DebtInstrumentAxis = fcx_A7.625SeniorNotesdue2018Member / dei_LegalEntityAxis = fcx_PlainsExplorationProductionCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |  |  |
Freeport McMoRan Corporation [Member] | 7.125% Debentures due 2027 [Member] | Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 115,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_DebenturesDue2027Member / dei_LegalEntityAxis = fcx_FreeportMcmoranCorporationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember | 115,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_DebenturesDue2027Member / dei_LegalEntityAxis = fcx_FreeportMcmoranCorporationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |  | 115,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_DebenturesDue2027Member / dei_LegalEntityAxis = fcx_FreeportMcmoranCorporationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |  |  |  |  |  |  |  |
Freeport McMoRan Corporation [Member] | 9.5% Senior Notes due 2031 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 129,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue2031Member / dei_LegalEntityAxis = fcx_FreeportMcmoranCorporationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 130,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue2031Member / dei_LegalEntityAxis = fcx_FreeportMcmoranCorporationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 130,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue2031Member / dei_LegalEntityAxis = fcx_FreeportMcmoranCorporationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Freeport McMoRan Corporation [Member] | 6.125% Senior Notes due 2034 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 116,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue2034Member / dei_LegalEntityAxis = fcx_FreeportMcmoranCorporationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 115,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue2034Member / dei_LegalEntityAxis = fcx_FreeportMcmoranCorporationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 115,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = fcx_SeniorNotesDue2034Member / dei_LegalEntityAxis = fcx_FreeportMcmoranCorporationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Option 1 [Member] | Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember / fcx_SupplementalDataAxis = fcx_Option1Member |  |  |  |  |  |  |  |  |  |  |
Option 1 [Member] | Revolving Credit Facility [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain / fcx_SupplementalDataAxis = fcx_Option1Member |  |  |  |  |  |  |  |  |  |  |
Option 2 [Member] | Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | ABR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember / fcx_SupplementalDataAxis = fcx_Option2Member |  |  |  |  |  |  |  |  |  |  |
Option 2 [Member] | Revolving Credit Facility [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | ABR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain / fcx_SupplementalDataAxis = fcx_Option2Member |  |  |  |  |  |  |  |  |  |  |
Tranche 1 [Member] | Cerro Verde [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Expiration Date | Sep. 30, 2017 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity, Percentage | 85.00%fcx_LineofCreditFacilityCurrentBorrowingCapacityPercentage / dei_LegalEntityAxis = fcx_CerroVerdeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain / fcx_SupplementalDataAxis = fcx_Tranche1Member |  |  |  |  |  |  |  |  |  |  |
Tranche 2 [Member] | Cerro Verde [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Expiration Date | Mar. 31, 2018 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity, Percentage | 70.00%fcx_LineofCreditFacilityCurrentBorrowingCapacityPercentage / dei_LegalEntityAxis = fcx_CerroVerdeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain / fcx_SupplementalDataAxis = fcx_Tranche2Member |  |  |  |  |  |  |  |  |  |  |
Tranche 3 [Member] | Cerro Verde [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Expiration Date | Sep. 30, 2018 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity, Percentage | 35.00%fcx_LineofCreditFacilityCurrentBorrowingCapacityPercentage / dei_LegalEntityAxis = fcx_CerroVerdeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain / fcx_SupplementalDataAxis = fcx_Tranche3Member |  |  |  |  |  |  |  |  |  |  |
Fourth-Quarter 2014 [Member] | Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  | 100,000,000 us-gaap_RepaymentsOfDebt / us-gaap_ExtinguishmentOfDebtAxis = fcx_FourthQuarter2014Member / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember |  |  |  |  |  |  |
2015 [Member] | Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  | 550,000,000 us-gaap_RepaymentsOfDebt / us-gaap_ExtinguishmentOfDebtAxis = fcx_A2015Member / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember |  |  |  |  |  |  |
First-Quarter 2016 [Member] | Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  | 100,000,000 us-gaap_RepaymentsOfDebt / us-gaap_ExtinguishmentOfDebtAxis = fcx_FirstQuarter2016Member / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember |  |  |  |  |  |  |
Subsequent Event [Member] | Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, by Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  |  |  |  |  |  |  |  |  |  | 225,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  |  |  |  |  |  |  |  |  |  | 269,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Long-term Debt, Maturities, Repayments of Principal in Year Four |  |  |  |  |  |  |  |  |  |  |  | 1,100,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Long-term Debt, Maturities, Repayments of Principal in Year Five |  |  |  |  |  |  |  |  |  |  |  | 299,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Long-term Debt, Maturities, Repayments of Principal after Year Five |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event [Member] | Option 1 [Member] | Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  | LIBOR |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / fcx_SupplementalDataAxis = fcx_Option1Member |  |  |  |  |
Subsequent Event [Member] | Option 1 [Member] | Revolving Credit Facility [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  | LIBOR |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / fcx_SupplementalDataAxis = fcx_Option1Member |  |  |  |  |
Subsequent Event [Member] | Option 2 [Member] | Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  | ABR |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  | 0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = fcx_BankTermLoanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / fcx_SupplementalDataAxis = fcx_Option2Member |  |  |  |  |
Subsequent Event [Member] | Option 2 [Member] | Revolving Credit Facility [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  | ABR |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  | 0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CreditFacilityDomain / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / fcx_SupplementalDataAxis = fcx_Option2Member |  |  |  |  |

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- Definition Amount of borrowing capacity currently available under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility, expressed as a percentage of the maximum borrowing capacity. + References No definition available. + Details
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- Definition The fair value of royalty trust units as of a specified date. + References No definition available. + Details
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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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- Definition Expiration, mandatory redemption, or due date, in CCYY-MM-DD format, of the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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