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COMMITMENTS AND GUARANTEES (Mining Contracts) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 25, 2014 | Mar. 26, 2012
Contractual obligations mining contracts [line items] |  |  |  |  |  |  |  |  |
Number of Extention Periods Available Under Mining Contract |  |  | 2 fcx_NumberOfExtentionPeriodsAvailableUnderMiningContract |  |  |  |  |  |
Assurance Bond, Smelter Development |  |  | $ 115 fcx_AssuranceBondSmelterDevelopment | [1] | $ 0 fcx_AssuranceBondSmelterDevelopment | [1] |  |  |
PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |
Contractual obligations mining contracts [line items] |  |  |  |  |  |  |  |  |
Period For Option To Extend Mining Contract |  |  | 10 years |  |  |  |  |  |
Copper Royalty Rate Payable (in hundredths) | 4.00%fcx_CopperRoyaltyRatePayable / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember | 3.50%fcx_CopperRoyaltyRatePayable / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember |  |  |  |  |  |  |
Gold And Silver Sales Royalty Rate (in hundredths) | 3.75%fcx_GoldAndSilverSalesRoyaltyRate / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember | 1.00%fcx_GoldAndSilverSalesRoyaltyRate / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember |  |  | 1.00%fcx_GoldAndSilverSalesRoyaltyRate / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember |  |  |  |
Quantity of ore produced subject to additional royalties |  |  | 200,000 fcx_QuantityOfOreProducedInMillingFacility / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember |  |  |  |  |  |
Product Exports Ban, Date |  |  | Jan. 12, 2017 |  |  |  |  |  |
Effective Date, Memorandum of Understanding with Foreign Government | Jul. 25, 2014 |  |  |  |  |  |  |  |
Expiration Date, Memorandum of Understanding with Foreign Government |  |  | Jul. 25, 2015 |  |  |  |  |  |
Percentage of undivided interest owned by third party |  |  |  |  |  |  |  | 30.00%fcx_PercentOfUndividedInterestOwnedByThirdParty / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember |
Incremental Percent of Undivided Interest Owned by Third Party |  |  |  |  |  |  |  | 20.64%fcx_IncrementalPercentofUndividedInterestOwnedbyThirdParty / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember |
Expiration Date, Contract of Work | Dec. 31, 2021 |  |  |  |  |  |  |  |
Assurance Bond, Smelter Development |  |  | 115 fcx_AssuranceBondSmelterDevelopment / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember |  |  |  |  |  |
Royalty Expense |  |  | 115 us-gaap_RoyaltyExpense / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember |  | 109 us-gaap_RoyaltyExpense / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember |  | 93 us-gaap_RoyaltyExpense / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember |  |
Export Duties Expense |  |  | 77 fcx_ExportDutiesExpense / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember |  |  |  |  |  |
Export Permit Renewal Term |  |  | 6 months |  |  |  |  |  |
Tenke Fungurume [Member] |  |  |  |  |  |  |  |  |
Contractual obligations mining contracts [line items] |  |  |  |  |  |  |  |  |
Royalty Expense |  |  | 29 us-gaap_RoyaltyExpense / dei_LegalEntityAxis = fcx_TenkeFungurumeMember |  | 29 us-gaap_RoyaltyExpense / dei_LegalEntityAxis = fcx_TenkeFungurumeMember |  | 25 us-gaap_RoyaltyExpense / dei_LegalEntityAxis = fcx_TenkeFungurumeMember |  |
Royalty Rate Payable Under Amended And Restated Mining Convention (in hundredths) |  |  | 2.00%fcx_RoyaltyRatePayableUnderAmendedAndRestatedMiningConvention / dei_LegalEntityAxis = fcx_TenkeFungurumeMember |  |  |  |  |  |
Percentage of mining property owned by the company |  |  | 56.00%us-gaap_InvestmentOwnedPercentOfNetAssets / dei_LegalEntityAxis = fcx_TenkeFungurumeMember |  |  |  |  |  | 57.75%us-gaap_InvestmentOwnedPercentOfNetAssets / dei_LegalEntityAxis = fcx_TenkeFungurumeMember
Conversion of intercompany loans |  |  |  |  |  |  | $ 50 fcx_AmountOfIntercompanyLoansProposedToConvertToEquity / dei_LegalEntityAxis = fcx_TenkeFungurumeMember |  |
Stage 1 [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |
Contractual obligations mining contracts [line items] |  |  |  |  |  |  |  |  |
Progressive Export Duty on Copper Concentrates, Percent | 7.50%fcx_ProgressiveExportDutyonCopperConcentratesPercent / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember / fcx_SupplementalDataAxis = fcx_Stage1Member |  |  |  |  |  |  |  |
Stage 2 [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |
Contractual obligations mining contracts [line items] |  |  |  |  |  |  |  |  |
Progressive Export Duty on Copper Concentrates, Percent | 5.00%fcx_ProgressiveExportDutyonCopperConcentratesPercent / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember / fcx_SupplementalDataAxis = fcx_Stage2Member |  |  |  |  |  |  |  |
Smelter Development Progress, Percent | 7.50%fcx_SmelterDevelopmentProgressPercent / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember / fcx_SupplementalDataAxis = fcx_Stage2Member |  |  |  |  |  |  |  |
Stage 3 [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |
Contractual obligations mining contracts [line items] |  |  |  |  |  |  |  |  |
Progressive Export Duty on Copper Concentrates, Percent | 0.00%fcx_ProgressiveExportDutyonCopperConcentratesPercent / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember / fcx_SupplementalDataAxis = fcx_Stage3Member |  |  |  |  |  |  |  |
Smelter Development Progress, Percent | 30.00%fcx_SmelterDevelopmentProgressPercent / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember / fcx_SupplementalDataAxis = fcx_Stage3Member |  |  |  |  |  |  |  |
Maximum [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |
Contractual obligations mining contracts [line items] |  |  |  |  |  |  |  |  |
Copper Royalty Rate Payable (in hundredths) |  |  |  |  | 3.50%fcx_CopperRoyaltyRatePayable / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Price Of Copper Per Pound |  |  |  |  | 1.10 fcx_PriceOfCopperPerPoundToDetermineRoyaltyRate / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Progressive Export Duty on Copper Concentrates, Percent |  |  | 60.00%fcx_ProgressiveExportDutyonCopperConcentratesPercent / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |
Date, Contract of Work Extension | Dec. 31, 2041 |  |  |  |  |  |  |  |
Minimum [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |
Contractual obligations mining contracts [line items] |  |  |  |  |  |  |  |  |
Copper Royalty Rate Payable (in hundredths) |  |  |  |  | 1.50%fcx_CopperRoyaltyRatePayable / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Price Of Copper Per Pound |  |  |  |  | 0.90 fcx_PriceOfCopperPerPoundToDetermineRoyaltyRate / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Progressive Export Duty on Copper Concentrates, Percent |  |  | 25.00%fcx_ProgressiveExportDutyonCopperConcentratesPercent / dei_LegalEntityAxis = fcx_PtFreeportIndonesiaMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Date, Contract of Work Extension | Dec. 31, 2022 |  |  |  |  |  |  |  |
[1] | Relates to PT-FI's commitment for smelter development in Indonesia at December 31, 2014 (refer to Note 13 for further discussion).

X
- Definition Amount of intercompany loans to convert to equity + References No definition available. + Details
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Balance Type: | debit
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X
- Definition Amount of assurance bond provided for smelter development. + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The copper royalty rate of net revenues payable. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Dates of Contract of Work extension. + References No definition available. + Details
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Namespace Prefix: | fcx_
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Balance Type: | na
Period Type: | duration

X
- Definition The date that a Memorandum of Understanding with was entered into with a foreign government. + References No definition available. + Details
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Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date that contract of work between the company and the local government expires in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | fcx_
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Balance Type: | na
Period Type: | duration

X
- Definition The date that a Memorandum of Understanding with a foreign government expires or must be renewed by. + References No definition available. + Details
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X
- Definition Amount of expense related to export duty payments under a contractual arrangement such as payment for mineral exports. + References No definition available. + Details
Name: | fcx_ExportDutiesExpense
Namespace Prefix: | fcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Duration of time an export permit is valid before needing renewal. + References No definition available. + Details
Name: | fcx_ExportPermitRenewalTerm
Namespace Prefix: | fcx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The royalty rate for gold and silver sales under the Contract of Work. + References No definition available. + Details
Name: | fcx_GoldAndSilverSalesRoyaltyRate
Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The incremental percentage of undivided interest owned by a third party. + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of extention periods available stated in the existing mining contract. + References No definition available. + Details
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Namespace Prefix: | fcx_
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Balance Type: | na
Period Type: | instant

X
- Definition The percentage of undivided interest owned by a third party. + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The renewal terms stated in the existing contract relating to the period of time the Company has the option to extend the Mining Contract. + References No definition available. + Details
Name: | fcx_PeriodForOptionToExtendMiningContract
Namespace Prefix: | fcx_
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Balance Type: | na
Period Type: | duration

X
- Definition The price per pound of copper used to determine the royalty percentage. + References No definition available. + Details
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Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date through which companies may continue to export product in accordance with government regulations. + References No definition available. + Details
Name: | fcx_ProductExportsBanDate
Namespace Prefix: | fcx_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The progressive export duty on copper concentrates expressed as a percentage. + References No definition available. + Details
Name: | fcx_ProgressiveExportDutyonCopperConcentratesPercent
Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of production of gold and silver at the milling facilities that causes additional royalty payments. + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Royalty rate payable under the Amended and Restated Mining Contract. + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Progress of smelter development expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph 2 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.3) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611133-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column D.2) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611225-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph 3 -Article 12 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column D -Article 12 + Details
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Balance Type: | na
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- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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- Details
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