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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Costs Not Subject to Amortization) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |
Capitalized Costs of Unproved Properties Excluded from Amortization, Period Cost | $ 2,021,000,000 us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization | $ 8,066,000,000 us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization
Total | 10,087,000,000 us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative |
Costs Not Subject to Amortization to be Transferred, Percentage | 48.00%fcx_CostsNotSubjecttoAmortizationtobeTransferredPercentage |
Majority of Costs Not Subject to Amortization to be Transferred, Period | 5 years |
Net Undeveloped Acreage Covered by Expiring Leases, Percentage | 35.00%fcx_NetUndevelopedAcreageCoveredbyExpiringLeasesPercentage |
Haynesville [Member] |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |
Acreage Held by Production or Held by Operations, Percentage | 95.00%fcx_AcreageHeldbyProductionPercentage / us-gaap_StatementGeographicalAxis = fcx_HaynesvilleMember |
Onshore [Member] | U.S. [Member] |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |
Acquisition costs | 2,303,000,000 us-gaap_AcquisitionCostsCumulative / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OnshoreMember / us-gaap_StatementGeographicalAxis = country_US |
Acquisition Costs, Period Cost | 18,000,000 us-gaap_AcquisitionCosts / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OnshoreMember / us-gaap_StatementGeographicalAxis = country_US | 2,285,000,000 us-gaap_AcquisitionCosts / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OnshoreMember / us-gaap_StatementGeographicalAxis = country_US
Exploration costs | 121,000,000 us-gaap_ExplorationCostsCumulative / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OnshoreMember / us-gaap_StatementGeographicalAxis = country_US |
Exploration Costs, Period Cost | 119,000,000 us-gaap_ExplorationCosts / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OnshoreMember / us-gaap_StatementGeographicalAxis = country_US | 2,000,000 us-gaap_ExplorationCosts / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OnshoreMember / us-gaap_StatementGeographicalAxis = country_US
Capitalized interest | 27,000,000 fcx_CapitalizedInterestCostsNotSubjecttoAmortization / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OnshoreMember / us-gaap_StatementGeographicalAxis = country_US |
Capitalized Costs of Unproved Properties Excluded from Amortization, Period Cost | 22,000,000 us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OnshoreMember / us-gaap_StatementGeographicalAxis = country_US | 5,000,000 us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OnshoreMember / us-gaap_StatementGeographicalAxis = country_US
Offshore [Member] | U.S. [Member] |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |
Acquisition costs | 7,094,000,000 us-gaap_AcquisitionCostsCumulative / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = country_US |
Acquisition Costs, Period Cost | 1,413,000,000 us-gaap_AcquisitionCosts / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = country_US | 5,681,000,000 us-gaap_AcquisitionCosts / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = country_US
Exploration costs | 429,000,000 us-gaap_ExplorationCostsCumulative / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = country_US |
Exploration Costs, Period Cost | 387,000,000 us-gaap_ExplorationCosts / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = country_US | 42,000,000 us-gaap_ExplorationCosts / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = country_US
Capitalized interest | 75,000,000 fcx_CapitalizedInterestCostsNotSubjecttoAmortization / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = country_US |
Capitalized Costs of Unproved Properties Excluded from Amortization, Period Cost | 39,000,000 us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = country_US | 36,000,000 us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = country_US
Offshore [Member] | International [Member] |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |
Acquisition costs | 15,000,000 us-gaap_AcquisitionCostsCumulative / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = fcx_InternationalMember |
Acquisition Costs, Period Cost | 0 us-gaap_AcquisitionCosts / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = fcx_InternationalMember | 15,000,000 us-gaap_AcquisitionCosts / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = fcx_InternationalMember
Exploration costs | 23,000,000 us-gaap_ExplorationCostsCumulative / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = fcx_InternationalMember |
Exploration Costs, Period Cost | 23,000,000 us-gaap_ExplorationCosts / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = fcx_InternationalMember | 0 us-gaap_ExplorationCosts / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = fcx_InternationalMember
Capitalized interest | 0 fcx_CapitalizedInterestCostsNotSubjecttoAmortization / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = fcx_InternationalMember |
Capitalized Costs of Unproved Properties Excluded from Amortization, Period Cost | $ 0 us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = fcx_InternationalMember | $ 0 us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = fcx_OffshoreMember / us-gaap_StatementGeographicalAxis = fcx_InternationalMember
Minimum [Member] |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |
Remainder of Costs Not Subject to Amortization to be Transferred, Period | 7 years |
Maximum [Member] |  |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |  |
Remainder of Costs Not Subject to Amortization to be Transferred, Period | 10 years |

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- Definition The capitalized costs incurred during the period (excluded from amortization) in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 15 -Article 4 + Details
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