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Financial Instruments (Unaudited) Oil and Gas (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 MBbls | Dec. 31, 2014 | Sep. 30, 2014
Derivative [Line Items] |  |  |  |
Derivative Liability | $ 51 us-gaap_DerivativeLiabilities |  | $ 99 us-gaap_DerivativeLiabilities |
Maximum Price Limit per Barrel |  |  |  | 20 fcx_MaximumPriceLimitperBarrel
2015 Positions [Member] | Derivatives not designated as hedging instruments [Member] | Crude Oil Options [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Daily Volumes (Bbls) | 23,000,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilOptionsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_OpenOptionContractsWrittenTypeAxis = fcx_A2015PositionsMember |  |  |
2015 Positions [Member] | Derivatives not designated as hedging instruments [Member] | Crude Oil Options [Member] | 84 MBbls [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Daily Volumes (Bbls) | 84 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilOptionsMember / us-gaap_EnergyAxis = fcx_A84MBblsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_OpenOptionContractsWrittenTypeAxis = fcx_A2015PositionsMember | [1] |  |
Derivative, Average Floor Price | 90 us-gaap_DerivativeAverageFloorPrice / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilOptionsMember / us-gaap_EnergyAxis = fcx_A84MBblsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_OpenOptionContractsWrittenTypeAxis = fcx_A2015PositionsMember | [1],[2] |  |
Derivative, Average Floor Price Limit | 70 fcx_DerivativeAverageFloorPriceLimit / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilOptionsMember / us-gaap_EnergyAxis = fcx_A84MBblsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_OpenOptionContractsWrittenTypeAxis = fcx_A2015PositionsMember | [1],[2] |  |
Derivative, Underlying Basis | Brent | [1] |  |
Weighted Average [Member] | Crude Oil Options [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Deferred Premium Price | 6.89 fcx_DeferredPremiumPrice / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilOptionsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |  |
Weighted Average [Member] | 2015 Positions [Member] | Derivatives not designated as hedging instruments [Member] | Crude Oil Options [Member] | 84 MBbls [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Deferred Premium Price | 6.89 fcx_DeferredPremiumPrice / us-gaap_DerivativeInstrumentRiskAxis = fcx_CrudeOilOptionsMember / us-gaap_EnergyAxis = fcx_A84MBblsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_OpenOptionContractsWrittenTypeAxis = fcx_A2015PositionsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | [1] |  |
[1] | If the index price is less than the per barrel floor, FCX receives the difference between the per barrel floor and the index price up to a maximum of $20 per barrel less the option premium. If the index price is at or above the per barrel floor, FCX pays the option premium and no cash settlement is received.
[2] | The average strike prices do not reflect any premiums to purchase the put options.

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- Definition The deferred premium price per unit related to commodity derivative contracts. + References No definition available. + Details
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- Definition The derivative average floor price limit. + References No definition available. + Details
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- Definition The maximum price limit per barrel. + References No definition available. + Details
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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Reference to the index or unit of measurement for the underlying which establishes the pricing terms of the derivative instrument. For example, the basis on the underlying for a natural gas futures contract might be the NYMEX price per million British thermal units (MMBtu). + References No definition available. + Details
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