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DISPOSITIONS AND ACQUISITIONS (Dispositions) (Details) (USD $) | 3 Months Ended | 12 Months Ended | 10 Months Ended | 6 Months Ended |  |  |
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 03, 2014 | Jun. 30, 2014 | Oct. 06, 2014 | Sep. 08, 2014 | Jun. 20, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests | $ 4,187,000,000 us-gaap_MinorityInterest |  |  |  |  |  |  |  | $ 4,297,000,000 us-gaap_MinorityInterest |  |  |  |  |  |  |  | $ 4,187,000,000 us-gaap_MinorityInterest |  | $ 4,297,000,000 us-gaap_MinorityInterest |  |  |  |  |  |  |
(Loss) income before income taxes and equity in affiliated companies' net earnings (losses) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (424,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 4,913,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 5,487,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  |  |  |  |
Net income attributable to FCX common stockholders | (2,852,000,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1],[2],[3],[4],[5] | 552,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1],[2],[3],[4],[5] | 482,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1],[3],[5] | 510,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1] | 707,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [10],[6],[7],[8],[9] | 821,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [8],[9] | 482,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [10],[11],[7],[8],[9] | 648,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [10],[8] | (1,308,000,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1],[2],[3],[4],[5] | 2,658,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [10],[11],[6],[7],[8],[9] | 3,041,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |  |  |  |
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 |  |  |  |  |  |  |
Candelaria and Ojos del Salado Mining Complex [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Date | Nov. 03, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's direct ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00%us-gaap_InvestmentOwnedPercentOfNetAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested | 1,800,000,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  |
Business Combination, Contingent Consideration Arrangements, Basis for Amount | five percent of net copper revenues in any annual period over the next five years when the average realized copper price exceeds $4.00 per pound |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses, Net of Tax | 1,500,000,000 fcx_ProceedsfromDivestitureofBusinessesNetofTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 671,000,000 us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  |
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Net of Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 450,000,000 us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  |
Business Acquisition, Effective Date of Acquisition | Jun. 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 482,000,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  |
Long-term assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,155,000,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,000,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  |
Long-term liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 89,000,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 242,000,000 us-gaap_MinorityInterest / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  |
(Loss) income before income taxes and equity in affiliated companies' net earnings (losses) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 689,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  | 547,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember | 270,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  |
Net income attributable to FCX common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 341,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  | 304,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember | 144,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fcx_CandelariaandOjosdelSaladoMiningComplexMember |  |  |  |
Eagle Ford [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 20, 2014 |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,100,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = fcx_EagleFordMember |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 01, 2014 |  |  |
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances |  |  |  |  | 84,000,000 fcx_IncomeTaxExpenseBenefitChangesinDeferredTaxLiabilitiesandDeferredTaxAssetValuationAllowances / us-gaap_BusinessAcquisitionAxis = fcx_EagleFordMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (221,000,000)fcx_AdjustmenttoGoodwill / us-gaap_BusinessAcquisitionAxis = fcx_EagleFordMember |  |  |  |  |  | 221,000,000 fcx_AdjustmenttoGoodwill / us-gaap_BusinessAcquisitionAxis = fcx_EagleFordMember |  |  |
Deposits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 414,000,000 us-gaap_Deposits / us-gaap_BusinessAcquisitionAxis = fcx_EagleFordMember | $ 1,300,000,000 us-gaap_Deposits / us-gaap_BusinessAcquisitionAxis = fcx_EagleFordMember
[1] | Includes credits (charges) of $15 million ($9 million to net income attributable to common stockholders or $0.01 per share) in the first quarter, $(7) million ($(4) million to net income attributable to common stockholders) in the second quarter, $122 million ($76 million to net income attributable to common stockholders or $0.07 per share) in the third quarter, $497 million ($309 million to net loss attributable to common stockholders or $0.30 per share) in the fourth quarter and $627 million ($389 million to net loss attributable to common stockholders or $0.37 per share) for the year for net unrealized and noncash realized gains (losses) on crude oil and natural gas derivative contracts.
[2] | Includes net gains of $46 million ($31 million to net income attributable to common stockholders or $0.03 per share) in third quarter, $671 million ($450 million to net loss attributable to common stockholders or $0.43 per share) in the fourth quarter and $717 million ($481 million to net loss attributable to common stockholders or $0.46 per share) for the year primarily from the sale of the Candelaria and Ojos del Salado copper mining operations in the fourth quarter (refer to Note 2 for further discussion) and the sale of a metals injection molding plant in the third quarter.
[3] | Includes a tax charge of $57 million ($0.06 per share) in the second quarter, $5 million in the third quarter, $22 million ($0.02 per share) in the fourth quarter and $84 million ($0.08 per share) for the year associated with deferred taxes recorded in connection with the allocation of goodwill to the sale of the Eagle Ford properties. Additionally, includes a net tax charge (benefit) of $54 million ($7 million attributable to noncontrolling interests and $47 million to net income attributable to common stockholders or $0.04 per share) in the third quarter, $(17) million ($11 million attributable to noncontrolling interests and $(28) million to net loss attributable to common stockholders or $(0.03) per share) in the fourth quarter and $37 million ($18 million attributable to noncontrolling interests and $19 million to net loss attributable to common stockholders or $0.02 per share) for the year associated with changes in Chilean tax rules, U.S. federal income tax regulations and Peruvian tax rules, partially offset by a tax benefit related to changes in U.S. state income tax filing positions.
[4] | Includes a charge of $308 million ($192 million to net income attributable to common stockholders or $0.18 per share) in the third quarter, $3.4 billion ($2.1 billion to net loss attributable to common stockholders or $2.05 per share) in the fourth quarter and $3.7 billion ($2.3 billion to net loss attributable to common stockholders or $2.24 per share) for the year to reduce the carrying value of oil and gas properties pursuant to full cost accounting rules. Additionally, the fourth quarter and the year includes a goodwill impairment charge of $1.7 billion ($1.65 per share) for the full carrying value of goodwill.
[5] | Includes net gains (losses) on early extinguishment of debt totaling $4 million in the second quarter, $17 million ($0.02 per share) in the third quarter, $(18) million ($(0.02) per share) in the fourth quarter and $3 million for the year. Refer to Note 8 for further discussion.
[6] | Includes charges in the fourth quarter and for the year of (i) $76 million ($49 million to net income attributable to common stockholders or $0.05 per share) associated with updated mine plans at Morenci that resulted in a loss in recoverable copper in leach stockpiles, (ii) $37 million ($23 million to net income attributable to common stockholders or $0.02 per share) associated with the restructuring of an executive employment arrangement and (iii) $36 million ($13 million to net income attributable to common stockholders or $0.01 per share) associated with a new labor agreement at Cerro Verde.
[7] | Includes a net tax benefit of $183 million ($0.19 per share) in the second quarter, $16 million ($0.01 per share) in the fourth quarter and $199 million ($0.20 per share) for the year associated with net reductions in FCX's deferred tax liabilities and deferred tax asset valuation allowances related to the acquisitions of PXP and MMR.
[8] | Includes charges of $14 million ($10 million to net income attributable to common stockholders or $0.01 per share) in the first quarter, $61 million ($36 million to net income attributable to common stockholders or $0.04 per share) in the second quarter, $1 million ($1 million to net income attributable to common stockholders) in the third quarter, $4 million ($3 million to net income attributable to common stockholders) in the fourth quarter and $80 million ($50 million to net income attributable to common stockholders or $0.05 per share) for the year for transaction and related costs principally associated with the acquisitions of PXP and MMR.
[9] | Includes charges of $36 million ($23 million to net income attributable to common stockholders or $0.02 per share) in the second quarter, $158 million ($98 million to net income attributable to common stockholders or $0.09 per share) in the third quarter, $118 million ($73 million to net income attributable to common stockholders or $0.07 per share) in the fourth quarter and $312 million ($194 million to net income attributable to common stockholders or $0.19 per share) for the year (reflecting the seven-month period from June 1, 2013, to December 31, 2013) for unrealized and noncash realized losses on crude oil and natural gas derivative contracts.
[10] | Includes net (losses) gains on early extinguishment of debt totaling $(40) million ($(0.04) per share) in the first quarter, $5 million ($0.01 per share) in the second quarter for an adjustment related to taxes on the first quarter losses, $7 million ($0.01 per share) in the fourth quarter and $(28) million ($(0.03) per share) for the year. Refer to Note 8 for further discussion.
[11] | Includes a gain of $128 million ($0.13 per share) in the second quarter and for the year related to FCX's preferred stock investment in and the subsequent acquisition of MMR. Refer to Note 2 for further discussion.

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