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DISPOSITIONS AND ACQUISITIONS (Pro Forma) (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | $ 23,075,000,000 us-gaap_BusinessAcquisitionsProFormaRevenue |  | $ 22,713,000,000 us-gaap_BusinessAcquisitionsProFormaRevenue |
Operating income |  |  |  |  |  |  | 6,267,000,000 fcx_BusinessAcquisitionProFormaOperatingIncomeLoss |  | 6,815,000,000 fcx_BusinessAcquisitionProFormaOperatingIncomeLoss |
Income from continuing operations |  |  |  |  |  |  | 3,626,000,000 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax |  | 4,277,000,000 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax |
Net income attributable to FCX common stockholders |  |  |  |  |  |  | 2,825,000,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss |  | 3,301,000,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss |
Net income per share attributable to FCX common stockholders, basic |  |  |  |  |  |  | $ 2.71 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic |  | $ 3.17 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic |
Net income per share attributable to FCX common stockholders, diluted |  |  |  |  |  |  | $ 2.70 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted |  | $ 3.16 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted |
Business Combination, Acquisition Related Costs, Including Acquiree Costs |  |  |  |  |  |  | 519,000,000 fcx_BusinessCombinationAcquisitionRelatedCostsIncludingAcquireeCosts |  |  |
Income Tax Expense (Benefit) Adjustments |  |  |  | (16,000,000)fcx_IncomeTaxExpenseBenefitAdjustments | (183,000,000)fcx_IncomeTaxExpenseBenefitAdjustments | 0 fcx_IncomeTaxExpenseBenefitAdjustments | (199,000,000)fcx_IncomeTaxExpenseBenefitAdjustments | [1] | (205,000,000)fcx_IncomeTaxExpenseBenefitAdjustments | [2],[3]
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances | (22,000,000)fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowances | (5,000,000)fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowances | (57,000,000)fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowances |  |  | (84,000,000)fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowances | 190,000,000 fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowances |  |  |
Gain on investment in McMoRan Exploration Co. (MMR) |  |  |  |  |  | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 128,000,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain |  | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain |
Gain (Loss) on Disposition of Oil and Gas Property |  |  |  |  |  |  | $ 77,000,000 us-gaap_GainLossOnSaleOfOilAndGasProperty |  |  |
[1] | As a result of the oil and gas acquisitions, FCX recognized a net tax benefit of $199 million consisting of income tax benefits of $190 million associated with net reductions in FCX's valuation allowances, $69 million related to the release of the deferred tax liability on PXP's investment in MMR common stock and $16 million associated with the revaluation of state deferred tax liabilities, partially offset by income tax expense of $76 million associated with the write off of deferred tax assets related to environmental liabilities.
[2] | Cerro Verde previously recorded deferred Peruvian income tax liabilities for income taxes that would become payable if the reinvested profits used to fund the initial Cerro Verde sulfide expansion were distributed prior to the expiration of Cerro Verde's 1998 stability agreement on December 31, 2013. Because reinvested profits at Cerro Verde were not expected to be distributed prior to December 31, 2013, a net deferred income tax liability of $234 million was reversed and recognized as an income tax benefit in 2012.
[3] | In 2012, Cerro Verde signed a new 15-year mining stability agreement with the Peruvian government, which became effective January 1, 2014. In connection with the new mining stability agreement, Cerro Verde's income tax rate increased from 30 percent to 32 percent, and FCX recognized additional deferred tax expense of $29 million.

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities, including costs incurred by the acquiree. + References No definition available. + Details
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- Definition The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations and associated with changes in foreign tax rates, certain tax elections affect on current and deferred income taxes and changes in valuation allowances. + References No definition available. + Details
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- Definition Income tax expense (benefit) related to changes in deferred tax liabilities and deferred tax asset valuation allowances. + References No definition available. + Details
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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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