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OTHER ASSETS (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule Of Other Assets [Line Items] |  |  |  |
Intangible assets | $ 334 us-gaap_IntangibleAssetsNetExcludingGoodwill | [1] | $ 380 us-gaap_IntangibleAssetsNetExcludingGoodwill | [1]
Investments: [Abstract] |  |  |  |
Assurance bond | 115 fcx_AssuranceBondSmelterDevelopment | [2] | 0 fcx_AssuranceBondSmelterDevelopment | [2]
Available-for-sale securities | 46 us-gaap_AvailableForSaleSecuritiesNoncurrent |  | 44 us-gaap_AvailableForSaleSecuritiesNoncurrent |
Other | 60 us-gaap_OtherInvestments |  | 63 us-gaap_OtherInvestments |
Legally restricted funds | 172 us-gaap_RestrictedCashAndInvestmentsNoncurrent | [3] | 392 us-gaap_RestrictedCashAndInvestmentsNoncurrent | [3]
Loan to a DRC public electric utility | 164 us-gaap_NotesAndLoansReceivableNetNoncurrent |  | 152 us-gaap_NotesAndLoansReceivableNetNoncurrent |
Debt issue costs | 141 us-gaap_DeferredFinanceCostsNoncurrentNet |  | 107 us-gaap_DeferredFinanceCostsNoncurrentNet |
Deferred drillship costs | 113 us-gaap_OtherDeferredCostsNet |  | 0 us-gaap_OtherDeferredCostsNet |
Long-term receivable for income tax refunds | 63 us-gaap_IncomeTaxesReceivableNoncurrent |  | 77 us-gaap_IncomeTaxesReceivableNoncurrent |
Loan to Gécamines (related party) | 37 us-gaap_NotesReceivableRelatedPartiesNoncurrent |  | 34 us-gaap_NotesReceivableRelatedPartiesNoncurrent |
Other | 214 us-gaap_OtherAssetsMiscellaneousNoncurrent |  | 151 us-gaap_OtherAssetsMiscellaneousNoncurrent |
Total other assets | 2,077 us-gaap_OtherAssetsNoncurrent |  | 1,798 us-gaap_OtherAssetsNoncurrent |
Finite-Lived Intangible Assets, Accumulated Amortization | 62 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | 57 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Legally restricted funds for asset retirement obligations at New Mexico mines |  |  | 158 us-gaap_AssetRetirementObligationLegallyRestrictedAssetsFairValue |
PT Smelting [Member] |  |  |  |
Investments: [Abstract] |  |  |  |
Equity method investment | 107 us-gaap_EquityMethodInvestments / invest_InvestmentIssuerAxis = fcx_PtSmeltingMember | [4] | 71 us-gaap_EquityMethodInvestments / invest_InvestmentIssuerAxis = fcx_PtSmeltingMember | [4]
PT Freeport Indonesia [Member] |  |  |  |
Schedule Of Other Assets [Line Items] |  |  |  |
Disputed tax assessments | 279 fcx_DisputedTaxAssessmentsReceivableNoncurrent / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember | [5] | 255 fcx_DisputedTaxAssessmentsReceivableNoncurrent / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember | [5]
Investments: [Abstract] |  |  |  |
Assurance bond | 115 fcx_AssuranceBondSmelterDevelopment / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember |  |  |
Cerro Verde [Member] |  |  |  |
Schedule Of Other Assets [Line Items] |  |  |  |
Disputed tax assessments | 232 fcx_DisputedTaxAssessmentsReceivableNoncurrent / dei_LegalEntityAxis = fcx_CerroVerdeMember | [5] | 72 fcx_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 | 24 fcx_SubsidiarysShareOfProfitsOnSalesToAffiliateEliminatedInNetInvestment / dei_LegalEntityAxis = fcx_PtSmeltingMember |  | 58 fcx_SubsidiarysShareOfProfitsOnSalesToAffiliateEliminatedInNetInvestment / dei_LegalEntityAxis = fcx_PtSmeltingMember |
Bank Time Deposits [Member] |  |  |  |
Investments: [Abstract] |  |  |  |
Legally restricted funds |  |  | $ 210 us-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.

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