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FINANCIAL INSTRUMENTS (Derivative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Derivative [Line Items] |  |  |  |
Credit Derivative, Maximum Exposure, Undiscounted | 379 us-gaap_CreditDerivativeMaximumExposureUndiscounted |  |  |
Cash and cash equivalents | 464 us-gaap_CashAndCashEquivalentsAtCarryingValue | 1,985 us-gaap_CashAndCashEquivalentsAtCarryingValue | 3,705 us-gaap_CashAndCashEquivalentsAtCarryingValue | 4,822 us-gaap_CashAndCashEquivalentsAtCarryingValue
Embedded derivatives in provisional sales contracts, Copper [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative held (in lbs except gold in oz) | 574,000,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcx_EmbeddedDerivativesInProvisionalSalesContractsCopperMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |
Average contract price | 3.02 us-gaap_DerivativeAverageForwardPrice / us-gaap_DerivativeInstrumentRiskAxis = fcx_EmbeddedDerivativesInProvisionalSalesContractsCopperMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |
Average market price | 2.86 fcx_DerivativeAverageMarketPrice / us-gaap_DerivativeInstrumentRiskAxis = fcx_EmbeddedDerivativesInProvisionalSalesContractsCopperMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |
Embedded derivatives in provisional sales contracts, Gold [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative held (in lbs except gold in oz) | 178,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcx_EmbeddedDerivativesInProvisionalSalesContractsGoldMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |
Average contract price | 1,207.00 us-gaap_DerivativeAverageForwardPrice / us-gaap_DerivativeInstrumentRiskAxis = fcx_EmbeddedDerivativesInProvisionalSalesContractsGoldMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |
Average market price | 1,200.00 fcx_DerivativeAverageMarketPrice / us-gaap_DerivativeInstrumentRiskAxis = fcx_EmbeddedDerivativesInProvisionalSalesContractsGoldMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |
Embedded derivatives in provisional purchase contracts, Copper [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative held (in lbs except gold in oz) | 101,000,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcx_EmbeddedDerivativesInProvisionalPurchaseContractsCopperMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |
Average contract price | 3.01 us-gaap_DerivativeAverageForwardPrice / us-gaap_DerivativeInstrumentRiskAxis = fcx_EmbeddedDerivativesInProvisionalPurchaseContractsCopperMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |
Average market price | 2.87 fcx_DerivativeAverageMarketPrice / us-gaap_DerivativeInstrumentRiskAxis = fcx_EmbeddedDerivativesInProvisionalPurchaseContractsCopperMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative held (in lbs except gold in oz) | 13,000,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |
Average contract price | 2.90 us-gaap_DerivativeAverageForwardPrice / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |
Maximum [Member] | Embedded derivatives in provisional sales contracts, Copper [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Maturities | May 2015 |  |  |
Maximum [Member] | Embedded derivatives in provisional sales contracts, Gold [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Maturities | April 2015 |  |  |
Maximum [Member] | Embedded derivatives in provisional purchase contracts, Copper [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Maturities | April 2015 |  |  |
Maximum [Member] | Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Maturities | February 2015 |  |  |
Fair Value Hedging [Member] | Commodity Contract [Member] | Copper Futures and Swap Contracts [Member] | Derivatives Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative held (in lbs except gold in oz) | 50,000,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcx_FmcsCopperFuturesAndSwapContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |
Average contract price | 2.97 us-gaap_DerivativeAverageForwardPrice / us-gaap_DerivativeInstrumentRiskAxis = fcx_FmcsCopperFuturesAndSwapContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_FinancialInstrumentAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |
Fair Value Hedging [Member] | Maximum [Member] | Commodity Contract [Member] | Copper Futures and Swap Contracts [Member] | Derivatives Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Maturities | May 2016 |  |  |
Bank Time Deposits [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash and cash equivalents | 48 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_BankTimeDepositsMember | $ 211 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_BankTimeDepositsMember |  |

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- Definition The average market price for a group of price risk forward or futures contracts, such as gas futures contracts. + References No definition available. + Details
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- Definition The month of the latest date the derivative matures. + 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 Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5708775-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Credit Derivative -URI http://asc.fasb.org/extlink&oid=6854095 + Details
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