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DISPOSITIONS AND ACQUISITIONS (Redeemable Noncontrolling Interest) (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 03, 2013 | May 31, 2013
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Redeemable noncontrolling interest | $ 751,000,000 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests | $ 716,000,000 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests |  |  | $ 259,000,000 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests |
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 |
Plains Offshore Operations Inc. [Member] |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Preferred Stock Of Subsidiary |  |  |  | 450,000 fcx_PreferredStockOfSubsidiary / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  | 450,000,000 us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member |  |
Class of Warrants or Rights, Exercise Price of Warrants or Rights |  |  |  | $ 20 fcx_ClassofWarrantsorRightsExercisePriceofWarrantsorRights / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member |  |
Nondetachable Warrants |  |  |  | 9,100,000 fcx_NondetachableWarrants / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member |  |
Common Stock Held In Escrow |  |  |  | 87,000,000 fcx_CommonStockHeldInEscrow / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member |  |
Equity Interest Held By Outside Party, Percent |  |  |  | 20.00%fcx_EquityInterestHeldByOutsidePartyPercent / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member |  |
Preferred Stock Quarterly Cash Dividend Annual Rate Percentage |  | 8.00%fcx_PreferredStockQuarterlyCashDividendAnnualRatePercentage / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member |  |  |  |
Preferred Stock Dividend Rate Percentage Deferred |  | 2.00%fcx_PreferredStockDividendRatePercentageDeferred / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member |  |  |  |
Dividends Payable |  | 34,000,000 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member |  |  |  |
Participating Dividends Future Multiple |  | 4 fcx_ParticipatingDividendsFutureMultiple / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member |  |  |  |
Redeemable noncontrolling interest | $ 751,000,000 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member | $ 716,000,000 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member |  |  |  | $ 708,000,000 us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member
8% Convertible Perpetual Preferred Stock [Member] |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 8.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = fcx_A8ConvertiblePerpetualPreferredStockMember |  |  |  |
5.75% Convertible Perpetual Preferred Stock, Series 1 [Member] |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.75%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = fcx_A5.75ConvertiblePerpetualPreferredStockSeries1Member |  |  |  |
Minimum [Member] | Plains Offshore Operations Inc. [Member] |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Depth of Oil and Gas Properties |  |  |  | 500 fcx_DepthofOilandGasProperties / dei_LegalEntityAxis = fcx_PlainsOffshoreOperationsInc.Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |

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