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INCOME TAXES (Mining Royalty Taxes) (Details) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2019 | Jul. 31, 2012
Chile [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Foreign Income Tax Rate | 35.00%fcx_ForeignIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL |  |
Peru [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Foreign Income Tax Rate | 30.00%fcx_ForeignIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_PE | 26.00%fcx_ForeignIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_PE |
Cerro Verde [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Foreign Income Tax Rate |  |  | 30.00%fcx_ForeignIncomeTaxRate / dei_LegalEntityAxis = fcx_CerroVerdeMember
Foreign Income Tax Rate Under New Stability Agreegment | 32.00%fcx_ForeignIncomeTaxRateUnderNewStabilityAgreegment / dei_LegalEntityAxis = fcx_CerroVerdeMember |  | 32.00%fcx_ForeignIncomeTaxRateUnderNewStabilityAgreegment / dei_LegalEntityAxis = fcx_CerroVerdeMember
Expiration Date, Stability Agreement | Dec. 31, 2028 |  |
2010 [Member] | Chile [Member] | Stabilized Rate [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_StabilizedMiningRoyaltyTaxRateMember / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2010Member |  |
2010 [Member] | Chile [Member] | Minimum [Member] | Special Mining Burden [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_SpecialMiningBurdenMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2010Member |  |
2010 [Member] | Chile [Member] | Maximum [Member] | Special Mining Burden [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 9.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_SpecialMiningBurdenMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2010Member |  |
2011 [Member] | Chile [Member] | Stabilized Rate [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_StabilizedMiningRoyaltyTaxRateMember / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2011Member |  |
2011 [Member] | Chile [Member] | Minimum [Member] | Special Mining Burden [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_SpecialMiningBurdenMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2011Member |  |
2011 [Member] | Chile [Member] | Maximum [Member] | Special Mining Burden [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 9.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_SpecialMiningBurdenMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2011Member |  |
2012 [Member] | Chile [Member] | Stabilized Rate [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_StabilizedMiningRoyaltyTaxRateMember / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2012Member |  |
2012 [Member] | Chile [Member] | Minimum [Member] | Special Mining Burden [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_SpecialMiningBurdenMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2012Member |  |
2012 [Member] | Chile [Member] | Maximum [Member] | Special Mining Burden [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 9.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_SpecialMiningBurdenMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2012Member |  |
2013 [Member] | Chile [Member] | Stabilized Rate [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_StabilizedMiningRoyaltyTaxRateMember / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2013Member |  |
2013 [Member] | Chile [Member] | Special Mining Burden [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_SpecialMiningBurdenMember / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2013Member |  |
2014 [Member] | Chile [Member] | Stabilized Rate [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_StabilizedMiningRoyaltyTaxRateMember / us-gaap_TaxPeriodAxis = us-gaap_LatestTaxYearMember |  |
2014 [Member] | Chile [Member] | Special Mining Burden [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_SpecialMiningBurdenMember / us-gaap_TaxPeriodAxis = us-gaap_LatestTaxYearMember |  |
2014 [Member] | Peru [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Dividend Tax Rate | 4.10%fcx_DividendTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_PE / us-gaap_TaxPeriodAxis = us-gaap_LatestTaxYearMember |  |
2015 [Member] | Chile [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Foreign Income Tax Rate | 35.00%fcx_ForeignIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_TaxPeriodAxis = fcx_A2015Member |  |
2015 [Member] | Chile [Member] | Stabilized Rate [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_StabilizedMiningRoyaltyTaxRateMember / us-gaap_TaxPeriodAxis = fcx_A2015Member |  |
2015 [Member] | Chile [Member] | Special Mining Burden [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_SpecialMiningBurdenMember / us-gaap_TaxPeriodAxis = fcx_A2015Member |  |
2016 [Member] | Chile [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Foreign Income Tax Rate | 35.00%fcx_ForeignIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_TaxPeriodAxis = fcx_A2016Member |  |
2016 [Member] | Chile [Member] | Stabilized Rate [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_StabilizedMiningRoyaltyTaxRateMember / us-gaap_TaxPeriodAxis = fcx_A2016Member |  |
2016 [Member] | Chile [Member] | Special Mining Burden [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_SpecialMiningBurdenMember / us-gaap_TaxPeriodAxis = fcx_A2016Member |  |
2017 [Member] | Chile [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Foreign Income Tax Rate | 44.00%fcx_ForeignIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_TaxPeriodAxis = fcx_A2017Member |  |
2017 [Member] | Chile [Member] | Stabilized Rate [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_StabilizedMiningRoyaltyTaxRateMember / us-gaap_TaxPeriodAxis = fcx_A2017Member |  |
2017 [Member] | Chile [Member] | Special Mining Burden [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 4.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / fcx_MiningRoyaltyTaxesByTypeAxis = fcx_SpecialMiningBurdenMember / us-gaap_TaxPeriodAxis = fcx_A2017Member |  |
2018 [Member] | Chile [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Foreign Income Tax Rate | 44.50%fcx_ForeignIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_TaxPeriodAxis = fcx_A2018Member |  |
2018 [Member] | Chile [Member] | Minimum [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 5.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TaxPeriodAxis = fcx_A2018Member |  |
2018 [Member] | Chile [Member] | Maximum [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 14.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TaxPeriodAxis = fcx_A2018Member |  |
2019 [Member] | Chile [Member] | Minimum [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 5.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TaxPeriodAxis = fcx_A2019Member |  |
2019 [Member] | Chile [Member] | Maximum [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 14.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TaxPeriodAxis = fcx_A2019Member |  |
2019 [Member] | Peru [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Dividend Tax Rate | 9.30%fcx_DividendTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_PE / us-gaap_TaxPeriodAxis = fcx_A2019Member |  |
2020 [Member] | Chile [Member] | Minimum [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 5.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TaxPeriodAxis = fcx_A2020Member |  |
2020 [Member] | Chile [Member] | Maximum [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 14.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TaxPeriodAxis = fcx_A2020Member |  |
2021 [Member] | Chile [Member] | Minimum [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 5.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TaxPeriodAxis = fcx_A2021Member |  |
2021 [Member] | Chile [Member] | Maximum [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 14.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TaxPeriodAxis = fcx_A2021Member |  |
2022 [Member] | Chile [Member] | Minimum [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 5.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TaxPeriodAxis = fcx_A2022Member |  |
2022 [Member] | Chile [Member] | Maximum [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 14.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TaxPeriodAxis = fcx_A2022Member |  |
2023 [Member] | Chile [Member] | Minimum [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 5.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TaxPeriodAxis = fcx_A2023Member |  |
2023 [Member] | Chile [Member] | Maximum [Member] |  |  |
Mining royalty taxes by location [Line Items] |  |  |
Mining royalty tax rate | 14.00%fcx_MiningRoyaltyTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_CL / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_TaxPeriodAxis = fcx_A2023Member |  |

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