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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Estimated Quantities of Oil and Natural Gas Reserves) (Details) | 7 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 Boe | Dec. 31, 2014 Boe | Dec. 31, 2012 Boe
Proved reserves: |  |  |  |  |  |
Balance at beginning of period (BOE) |  |  | 464,000,000 fcx_ProvedDevelopedandUndevelopedReservesNetBarrelofOilEquivalents | [1] | 0 fcx_ProvedDevelopedandUndevelopedReservesNetBarrelofOilEquivalents | [1]
Extension and discoveries (BOE) | 24,000,000 fcx_ProvedDevelopedandUndevelopedReservesExtensionsDiscoveriesandAdditionsBarrelofOilEquivalents | [1] | 16,000,000 fcx_ProvedDevelopedandUndevelopedReservesExtensionsDiscoveriesandAdditionsBarrelofOilEquivalents | [1] |  |
Acquisitions of reserves in-place (BOE) | 472,000,000 fcx_ProvedDevelopedandUndevelopedReservesAcquisitionsBarrelofOilEquivalents | [1] | 16,000,000 fcx_ProvedDevelopedandUndevelopedReservesAcquisitionsBarrelofOilEquivalents | [1] |  |
Revisions of previous estimates (BOE) | 7,000,000 fcx_ProvedDevelopedandUndevelopedReservesRevisionsofPreviousEstimatesBarrelofOilEquivalents | [1] | 13,000,000 fcx_ProvedDevelopedandUndevelopedReservesRevisionsofPreviousEstimatesBarrelofOilEquivalents | [1] |  |
Sales of reserves in place (BOE) | (1,000,000)fcx_ProvedDevelopedandUndevelopedReservesSalesofMineralsinPlaceBarrelofOilEquivalents | [1] | (62,000,000)fcx_ProvedDevelopedandUndevelopedReservesSalesofMineralsinPlaceBarrelofOilEquivalents | [1] |  |
Production (BOE) | (38,000,000)fcx_ProvedDevelopedandUndevelopedReservesProductionBarrelofOilEquivalents | [1] | (57,000,000)fcx_ProvedDevelopedandUndevelopedReservesProductionBarrelofOilEquivalents | [1] |  |
Balance at end of period (BOE) | 464,000,000 fcx_ProvedDevelopedandUndevelopedReservesNetBarrelofOilEquivalents | [1] | 390,000,000 fcx_ProvedDevelopedandUndevelopedReservesNetBarrelofOilEquivalents | [1] | 0 fcx_ProvedDevelopedandUndevelopedReservesNetBarrelofOilEquivalents | [1]
Proved developed reserves (BOE) | 307,000,000 fcx_ProvedDevelopedReservesBarrelofOilEquivalents | [1] | 246,000,000 fcx_ProvedDevelopedReservesBarrelofOilEquivalents | [1] |  |
Proved undeveloped reserves (BOE) | 157,000,000 fcx_ProvedUndevelopedReservesBarrelofOilEquivalents | [1] | 144,000,000 fcx_ProvedUndevelopedReservesBarrelofOilEquivalents | [1] |  |
Eagle Ford [Member] |  |  |  |  |  |
Proved reserves: |  |  |  |  |  |
Extension and discoveries (BOE) | 16,000,000 fcx_ProvedDevelopedandUndevelopedReservesExtensionsDiscoveriesandAdditionsBarrelofOilEquivalents / us-gaap_StatementGeographicalAxis = fcx_EagleFordMember |  |  |  |  |
Gulf of Mexico [Member] |  |  |  |  |  |
Proved reserves: |  |  |  |  |  |
Extension and discoveries (BOE) | 5,000,000 fcx_ProvedDevelopedandUndevelopedReservesExtensionsDiscoveriesandAdditionsBarrelofOilEquivalents / us-gaap_StatementGeographicalAxis = fcx_GulfofMexicoMember |  | 8,000,000 fcx_ProvedDevelopedandUndevelopedReservesExtensionsDiscoveriesandAdditionsBarrelofOilEquivalents / us-gaap_StatementGeographicalAxis = fcx_GulfofMexicoMember |  |  |
Haynesville [Member] |  |  |  |  |  |
Proved reserves: |  |  |  |  |  |
Extension and discoveries (BOE) |  |  | 5,000,000 fcx_ProvedDevelopedandUndevelopedReservesExtensionsDiscoveriesandAdditionsBarrelofOilEquivalents / us-gaap_StatementGeographicalAxis = fcx_HaynesvilleMember |  |  |
Natural Gas Liquids [Member] |  |  |  |  |  |
Proved reserves: |  |  |  |  |  |
Balance at end of year | 20,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasLiquidsReservesMember |  | 10,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasLiquidsReservesMember |  |  |
Proved developed reserves | 14,000,000 us-gaap_ProvedDevelopedReservesVolume / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasLiquidsReservesMember |  | 7,000,000 us-gaap_ProvedDevelopedReservesVolume / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasLiquidsReservesMember |  |  |
Proved undeveloped reserves | 6,000,000 us-gaap_ProvedUndevelopedReserveVolume / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasLiquidsReservesMember |  | 3,000,000 us-gaap_ProvedUndevelopedReserveVolume / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasLiquidsReservesMember |  |  |
Oil [Member] |  |  |  |  |  |
Proved reserves: |  |  |  |  |  |
Balance at beginning of year |  |  | 370,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2]
Extensions and discoveries | 20,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] | 10,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] |  |
Acquisitions of reserves in-place | 368,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] | 14,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] |  |
Revisions of previous estimates | 11,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] | (10,000,000)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] |  |
Sale of reserves in-place | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] | (53,000,000)us-gaap_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] |  |
Production | (29,000,000)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] | (43,000,000)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] |  |
Balance at end of year | 370,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] | 288,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2]
Proved developed reserves | 236,000,000 us-gaap_ProvedDevelopedReservesVolume / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] | 184,000,000 us-gaap_ProvedDevelopedReservesVolume / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] |  |
Proved undeveloped reserves | 134,000,000 us-gaap_ProvedUndevelopedReserveVolume / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] | 104,000,000 us-gaap_ProvedUndevelopedReserveVolume / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember | [1],[2] |  |
Natural Gas [Member] |  |  |  |  |  |
Proved reserves: |  |  |  |  |  |
Balance at beginning of year |  |  | 562,000,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1]
Extensions and discoveries | 20,000,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] | 35,000,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] |  |
Acquisitions of reserves in-place | 626,000,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] | 9,000,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] |  |
Revisions of previous estimates | (26,000,000,000)us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] | 140,000,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] |  |
Sale of reserves in-place | (3,000,000,000)us-gaap_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] | (54,000,000,000)us-gaap_ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] |  |
Production | (55,000,000,000)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] | (82,000,000,000)us-gaap_ProvedDevelopedAndUndevelopedReservesProduction / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] |  |
Balance at end of year | 562,000,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] | 610,000,000,000 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] | 0 us-gaap_ProvedDevelopedAndUndevelopedReservesNet / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1]
Proved developed reserves | 423,000,000,000 us-gaap_ProvedDevelopedReservesVolume / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] | 369,000,000,000 us-gaap_ProvedDevelopedReservesVolume / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] |  |
Proved undeveloped reserves | 139,000,000,000 us-gaap_ProvedUndevelopedReserveVolume / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] | 241,000,000,000 us-gaap_ProvedUndevelopedReserveVolume / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember | [1] |  |
[1] | MMBbls = million barrels; Bcf = billion cubic feet; MMBOE = million BOE
[2] | Includes 10 MMBbls of NGL proved reserves (7 MMBbls of developed and 3 MMBbls of undeveloped) at December 31, 2014, and 20 MMBbls of NGL proved reserves (14 MMBbls of developed and 6 MMBbls of undeveloped) at December 31, 2013.

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