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DISPOSITIONS AND ACQUISITIONS (Purchase Price Allocation) (Details) (USD $) Share data in Millions, unless otherwise specified | 3 Months Ended | 7 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended |  |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014 | Jun. 30, 2014 | May 31, 2013 | Jun. 03, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  | $ 1,291,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets |  | $ 1,291,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets |  |  |
Subject to amortization |  | 12,200,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesSubjecttoDepletion |  | 12,200,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesSubjecttoDepletion |  | 12,198,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesSubjecttoDepletion |  | 12,198,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesSubjecttoDepletion |  |  |
Not subject to amortization |  | 11,100,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesNotSubjecttoDepletion |  | 11,100,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesNotSubjecttoDepletion |  | 11,112,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesNotSubjecttoDepletion |  | 11,112,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesNotSubjecttoDepletion |  |  |
Property, plant, and equipment |  |  |  |  |  | 262,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment |  | 262,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment |  |  |
Investment in MMR |  |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities | [1] | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities | [1] |  |
Other assets |  |  |  |  |  | 394,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets |  | 394,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets |  |  |
Current liabilities |  |  |  |  |  | (1,080,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities |  | (1,080,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities |  |  |
Debt (current and long-term) |  |  |  |  |  | (11,251,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt |  | (11,251,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt |  |  |
Deferred income taxes |  |  |  |  |  | (3,917,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent | [2] | (3,917,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent | [2] |  |
Other long-term liabilities |  |  |  |  |  | (1,061,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther |  | (1,061,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther |  |  |
Redeemable noncontrolling interest |  |  |  |  |  | (967,000,000)fcx_BusinessCombinationRecognizedTemporaryEquity |  | (967,000,000)fcx_BusinessCombinationRecognizedTemporaryEquity |  |  |
Total fair value, excluding goodwill |  |  |  |  |  | 6,981,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |  | 6,981,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |  |  |
Goodwill | 0 us-gaap_Goodwill | 1,916,000,000 us-gaap_Goodwill | 0 us-gaap_Goodwill | 1,916,000,000 us-gaap_Goodwill |  | 1,938,000,000 us-gaap_Goodwill |  | 1,938,000,000 us-gaap_Goodwill |  |  |
Total purchase price |  |  |  |  |  | 8,919,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet |  | 8,919,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet |  |  |
Business Combinations, Tax Rate, Fair Value Adjustments, Percent |  | 38.00%fcx_BusinessCombinationsTaxRateFairValueAdjustmentsPercent |  |  |  |  |  |  |  |  |
Federal Statutory Income Tax Rate, Percent |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |  |  |  |  |
State and Local Income Taxes, Percent |  | 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 27.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes |  |  |  |  |  |
Goodwill impairment | (1,700,000,000)us-gaap_GoodwillImpairmentLoss |  | (1,717,000,000)us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss |  |  |  |  |  |
Plains Exploration & Production Company [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  | 1,193,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | 1,193,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  |  |
Subject to amortization |  |  |  |  |  | 11,447,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | 11,447,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  |  |
Not subject to amortization |  |  |  |  |  | 9,401,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesNotSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | 9,401,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesNotSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  |  |
Property, plant, and equipment |  |  |  |  |  | 261,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | 261,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  |  |
Investment in MMR |  |  |  |  |  | 848,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember | [1] | 848,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember | [1] |  |
Other assets |  |  |  |  |  | 12,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | 12,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  |  |
Current liabilities |  |  |  |  |  | (906,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | (906,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  |  |
Debt (current and long-term) |  |  |  |  |  | (10,631,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | (10,631,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  |  |
Deferred income taxes |  |  |  |  |  | (3,917,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember | [2] | (3,917,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember | [2] |  |
Other long-term liabilities |  |  |  |  |  | (799,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | (799,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  |  |
Redeemable noncontrolling interest |  |  |  |  |  | (708,000,000)fcx_BusinessCombinationRecognizedTemporaryEquity / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | (708,000,000)fcx_BusinessCombinationRecognizedTemporaryEquity / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  |  |
Total fair value, excluding goodwill |  |  |  |  |  | 6,201,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | 6,201,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  |  |
Goodwill |  |  |  |  |  | 438,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | 438,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  |  |
Total purchase price |  |  |  |  |  | 6,639,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | 6,639,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |  | 6,639,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyMember |
McMoRan Exploration Co [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares |  |  |  |  |  |  |  |  |  | 51 us-gaap_InvestmentOwnedBalanceShares / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |
Current assets |  |  |  |  |  | 98,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  | 98,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
Subject to amortization |  |  |  |  |  | 751,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  | 751,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
Not subject to amortization |  |  |  |  |  | 1,711,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesNotSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  | 1,711,000,000 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesNotSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
Property, plant, and equipment |  |  |  |  |  | 1,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  | 1,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
Investment in MMR |  |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember | [1] | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember | [1] | 848,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |
Other assets |  |  |  |  |  | 382,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  | 382,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
Current liabilities |  |  |  |  |  | (174,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  | (174,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
Debt (current and long-term) |  |  |  |  |  | (620,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  | (620,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
Deferred income taxes |  |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember | [2] | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember | [2] |  |
Other long-term liabilities |  |  |  |  |  | (262,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  | (262,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
Redeemable noncontrolling interest |  |  |  |  |  | (259,000,000)fcx_BusinessCombinationRecognizedTemporaryEquity / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  | (259,000,000)fcx_BusinessCombinationRecognizedTemporaryEquity / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
Total fair value, excluding goodwill |  |  |  |  |  | 1,628,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  | 1,628,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
Goodwill |  |  |  |  |  | 1,500,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  | 1,500,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  |
Total purchase price |  |  |  |  |  | 3,128,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  | 3,128,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember |  |  | 3,128,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fcx_McmoranExplorationCoMember
Plains Exploration & Production Company and McMoRan Exploration Co [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 0 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyandMcMoRanExplorationCoMember | 1,916,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyandMcMoRanExplorationCoMember | 0 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyandMcMoRanExplorationCoMember | 1,916,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyandMcMoRanExplorationCoMember | 0 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyandMcMoRanExplorationCoMember |  |  |  |  |  |
Business Combination, Adjustment to Recognized Identifiable Assets Acquired and Liabilities Assumed Oil and Gas Properties Subject to Depletion |  |  |  |  |  | 5,000,000 fcx_BusinessCombinationAdjustmenttoRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyandMcMoRanExplorationCoMember |  |  |  |  |
Business Combination, Adjustment to Recognized Identifiable Assets Acquired and Liabilities Assumed Oil and Gas Properties Not Subject to Depletion |  |  |  |  |  | 25,000,000 fcx_BusinessCombinationAdjustmenttoRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesNotSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyandMcMoRanExplorationCoMember |  |  |  |  |
Increase in other assets (deferred income tax asset) |  |  |  |  |  | 42,000,000 fcx_BusinessCombinationAdjustmenttoRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyandMcMoRanExplorationCoMember |  |  |  |  |
(Decrease) increase in goodwill |  |  | 22,000,000 fcx_AdjustmenttoGoodwill / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyandMcMoRanExplorationCoMember | 1,916,000,000 fcx_AdjustmenttoGoodwill / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyandMcMoRanExplorationCoMember |  | 22,000,000 fcx_AdjustmenttoGoodwill / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyandMcMoRanExplorationCoMember |  |  |  |  |
Goodwill impairment |  |  | (1,717,000,000)us-gaap_GoodwillImpairmentLoss / us-gaap_BusinessAcquisitionAxis = fcx_PlainsExplorationProductionCompanyandMcMoRanExplorationCoMember |  |  |  |  |  |  |  |
Eagle Ford [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
(Decrease) increase in goodwill |  |  | (221,000,000)fcx_AdjustmenttoGoodwill / us-gaap_BusinessAcquisitionAxis = fcx_EagleFordMember |  |  |  |  | 221,000,000 fcx_AdjustmenttoGoodwill / us-gaap_BusinessAcquisitionAxis = fcx_EagleFordMember |  |  |
Intersubsegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  |  |
Subject to amortization |  |  |  |  |  | 0 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  | 0 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  |  |
Not subject to amortization |  |  |  |  |  | 0 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesNotSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  | 0 fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesNotSubjecttoDepletion / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  |  |
Property, plant, and equipment |  |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  |  |
Investment in MMR |  |  |  |  |  | (848,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember | [1] | (848,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember | [1] |  |
Other assets |  |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  |  |
Current liabilities |  |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  |  |
Debt (current and long-term) |  |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = us-gaap_IntersubsegmentEliminationsMember |  |  |
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Fair Value Inputs, Energy Measure | 80 fcx_FairValueInputsEnergyMeasure / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 80 fcx_FairValueInputsEnergyMeasure / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  | 98 fcx_FairValueInputsEnergyMeasure / us-gaap_RangeAxis = us-gaap_MaximumMember |
[1] | PXP owned 51 million shares of MMR common stock, which were eliminated in FCX's consolidated balance sheet at the acquisition date of MMR.
[2] | Deferred income taxes have been recognized based on the estimated fair value adjustments to net assets using a 38 percent tax rate, which reflected a 35 percent federal statutory rate and a 3 percent weighted-average of the applicable statutory state tax rates (net of federal benefit).

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