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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Changes in the Standardized Measure) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Supplemental Oil and Gas Information [Abstract] |  |  |  |
Balance at beginning of year | $ 9,417 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | [1] | $ 0 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | [1]
Reserves acquired in the acquisitions of PXP and MMR | 0 fcx_OilandGasReservesAcquiredinBusinessCombination |  | 14,467 fcx_OilandGasReservesAcquiredinBusinessCombination | [1]
Sales, net of production expenses | (3,062)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts |  | (2,296)us-gaap_SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts | [1]
Net changes in sales and transfer prices, net of production expenses | (2,875)us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts |  | (459)us-gaap_NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts | [1]
Extensions, discoveries and improved recoveries | 194 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts |  | 752 us-gaap_ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts | [1]
Changes in estimated future development costs | (498)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts |  | (1,190)us-gaap_IncreaseDecreaseInEstimatedFutureDevelopmentCosts | [1]
Previously estimated development costs incurred during the year | 982 us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod |  | 578 us-gaap_PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod | [1]
Sales of reserves in-place | (1,323)us-gaap_DecreaseDueToSalesOfMineralsInPlace |  | (12)us-gaap_DecreaseDueToSalesOfMineralsInPlace | [1]
Other purchases of reserves in-place | 487 us-gaap_IncreaseDueToPurchasesOfMineralsInPlace |  | 0 us-gaap_IncreaseDueToPurchasesOfMineralsInPlace | [1]
Revisions of quantity estimates | 399 us-gaap_RevisionsOfPreviousQuantityEstimates |  | 102 us-gaap_RevisionsOfPreviousQuantityEstimates | [1]
Accretion of discount | 1,195 us-gaap_AccretionOfDiscount |  | 701 us-gaap_AccretionOfDiscount | [1]
Net change in income taxes | 1,505 us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves |  | (3,226)us-gaap_IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves | [1]
Total changes | (2,996)us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease |  | 9,417 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease | [1]
Balance at end of year | $ 6,421 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves |  | $ 9,417 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | [1]
[1] | Includes the results of FM O&G beginning June 1, 2013.

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