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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 $ 751,000,000us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests $ 716,000,000us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests     $ 259,000,000us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests  
Payments for Repurchase of Preferred Stock and Preference Stock 0us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock 228,000,000us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock 0us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock      
Royalty Trust Units Issued, Conversion of Debt or Equity Instrument   17,700,000fcx_RoyaltyTrustUnitsIssuedConversionofDebtorEquityInstrument        
Royalty Trust Units, Fair Value Disclosure         31,000,000fcx_RoyaltyTrustUnitsFairValueDisclosure  
Plains Offshore Operations Inc. [Member]            
Redeemable Noncontrolling Interest [Line Items]            
Preferred Stock Of Subsidiary       450,000fcx_PreferredStockOfSubsidiary
/ dei_LegalEntityAxis
= fcx_PlainsOffshoreOperationsInc.Member
   
Proceeds from Issuance of Convertible Preferred Stock       450,000,000us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ dei_LegalEntityAxis
= fcx_PlainsOffshoreOperationsInc.Member
   
Class of Warrants or Rights, Exercise Price of Warrants or Rights       $ 20fcx_ClassofWarrantsorRightsExercisePriceofWarrantsorRights
/ dei_LegalEntityAxis
= fcx_PlainsOffshoreOperationsInc.Member
   
Nondetachable Warrants       9,100,000fcx_NondetachableWarrants
/ dei_LegalEntityAxis
= fcx_PlainsOffshoreOperationsInc.Member
   
Common Stock Held In Escrow       87,000,000fcx_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   34,000,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= fcx_PlainsOffshoreOperationsInc.Member
       
Participating Dividends Future Multiple   4fcx_ParticipatingDividendsFutureMultiple
/ dei_LegalEntityAxis
= fcx_PlainsOffshoreOperationsInc.Member
       
Redeemable noncontrolling interest $ 751,000,000us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
/ dei_LegalEntityAxis
= fcx_PlainsOffshoreOperationsInc.Member
$ 716,000,000us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
/ dei_LegalEntityAxis
= fcx_PlainsOffshoreOperationsInc.Member
      $ 708,000,000us-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       500fcx_DepthofOilandGasProperties
/ dei_LegalEntityAxis
= fcx_PlainsOffshoreOperationsInc.Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember