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OTHER ASSETS (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Other Assets [Line Items]    
Intangible assets $ 334us-gaap_IntangibleAssetsNetExcludingGoodwill [1] $ 380us-gaap_IntangibleAssetsNetExcludingGoodwill [1]
Investments: [Abstract]    
Assurance bond 115fcx_AssuranceBondSmelterDevelopment [2] 0fcx_AssuranceBondSmelterDevelopment [2]
Available-for-sale securities 46us-gaap_AvailableForSaleSecuritiesNoncurrent 44us-gaap_AvailableForSaleSecuritiesNoncurrent
Other 60us-gaap_OtherInvestments 63us-gaap_OtherInvestments
Legally restricted funds 172us-gaap_RestrictedCashAndInvestmentsNoncurrent [3] 392us-gaap_RestrictedCashAndInvestmentsNoncurrent [3]
Loan to a DRC public electric utility 164us-gaap_NotesAndLoansReceivableNetNoncurrent 152us-gaap_NotesAndLoansReceivableNetNoncurrent
Debt issue costs 141us-gaap_DeferredFinanceCostsNoncurrentNet 107us-gaap_DeferredFinanceCostsNoncurrentNet
Deferred drillship costs 113us-gaap_OtherDeferredCostsNet 0us-gaap_OtherDeferredCostsNet
Long-term receivable for income tax refunds 63us-gaap_IncomeTaxesReceivableNoncurrent 77us-gaap_IncomeTaxesReceivableNoncurrent
Loan to Gécamines (related party) 37us-gaap_NotesReceivableRelatedPartiesNoncurrent 34us-gaap_NotesReceivableRelatedPartiesNoncurrent
Other 214us-gaap_OtherAssetsMiscellaneousNoncurrent 151us-gaap_OtherAssetsMiscellaneousNoncurrent
Total other assets 2,077us-gaap_OtherAssetsNoncurrent 1,798us-gaap_OtherAssetsNoncurrent
Finite-Lived Intangible Assets, Accumulated Amortization 62us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 57us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Legally restricted funds for asset retirement obligations at New Mexico mines   158us-gaap_AssetRetirementObligationLegallyRestrictedAssetsFairValue
PT Smelting [Member]    
Investments: [Abstract]    
Equity method investment 107us-gaap_EquityMethodInvestments
/ invest_InvestmentIssuerAxis
= fcx_PtSmeltingMember		 [4] 71us-gaap_EquityMethodInvestments
/ invest_InvestmentIssuerAxis
= fcx_PtSmeltingMember		 [4]
PT Freeport Indonesia [Member]    
Schedule Of Other Assets [Line Items]    
Disputed tax assessments 279fcx_DisputedTaxAssessmentsReceivableNoncurrent
/ dei_LegalEntityAxis
= fcx_PtFreeportIndonesiaMember		 [5] 255fcx_DisputedTaxAssessmentsReceivableNoncurrent
/ dei_LegalEntityAxis
= fcx_PtFreeportIndonesiaMember		 [5]
Investments: [Abstract]    
Assurance bond 115fcx_AssuranceBondSmelterDevelopment
/ dei_LegalEntityAxis
= fcx_PtFreeportIndonesiaMember		  
Cerro Verde [Member]    
Schedule Of Other Assets [Line Items]    
Disputed tax assessments 232fcx_DisputedTaxAssessmentsReceivableNoncurrent
/ dei_LegalEntityAxis
= fcx_CerroVerdeMember		 [5] 72fcx_DisputedTaxAssessmentsReceivableNoncurrent
/ dei_LegalEntityAxis
= fcx_CerroVerdeMember		 [5]
PT Smelting [Member]    
Investments: [Abstract]    
Company's direct ownership percentage 25.00%us-gaap_InvestmentOwnedPercentOfNetAssets
/ dei_LegalEntityAxis
= fcx_PtSmeltingMember		  
Unrecognized profit on sales from PT Freeport Indonesia to PT Smelting 24fcx_SubsidiarysShareOfProfitsOnSalesToAffiliateEliminatedInNetInvestment
/ dei_LegalEntityAxis
= fcx_PtSmeltingMember		 58fcx_SubsidiarysShareOfProfitsOnSalesToAffiliateEliminatedInNetInvestment
/ dei_LegalEntityAxis
= fcx_PtSmeltingMember
Bank Time Deposits [Member]    
Investments: [Abstract]    
Legally restricted funds   $ 210us-gaap_RestrictedCashAndInvestmentsNoncurrent
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_BankTimeDepositsMember
[1] Intangible assets were net of accumulated amortization totaling $62 million at December 31, 2014, and $57 million at December 31, 2013.
[2] Relates to PT-FI's commitment for smelter development in Indonesia at December 31, 2014 (refer to Note 13 for further discussion).
[3] Includes $168 million for AROs related to properties in New Mexico at December 31, 2014, and a $210 million time deposit that secured a bank guarantee (until the time deposit was released as security for the bank guarantee in 2014) associated with the Cerro Verde royalty dispute and $158 million for AROs related to properties in New Mexico at December 31, 2013 (refer to Note 12 for further discussion).
[4] FCX's 25 percent ownership in PT Smelting (smelter and refinery in Gresik, Indonesia) is recorded using the equity method. Amounts were reduced by unrecognized profits on sales from PT-FI to PT Smelting totaling $24 million at December 31, 2014, and $58 million at December 31, 2013.
[5] Refer to Note 12 for further discussion.