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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Capitalized Costs) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Supplementary Oil and Gas Information [Abstract] |  |  |  |  |  |  |  |
Properties subject to amortization | $ 16,547 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross |  |  | $ 13,829 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross | $ 16,547 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross |  | $ 13,829 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross |
Accumulated amortization | (7,360)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities | [1] |  | (1,357)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities | (7,360)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities | [1] | (1,357)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities |
Total | 9,187 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet |  |  | 12,472 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet | 9,187 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet |  | 12,472 us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet |
Impairment of Oil and Gas Properties | $ 3,400 us-gaap_ImpairmentOfOilAndGasProperties |  | $ 308 us-gaap_ImpairmentOfOilAndGasProperties | $ 0 us-gaap_ImpairmentOfOilAndGasProperties | $ 3,737 us-gaap_ImpairmentOfOilAndGasProperties |  | $ 0 us-gaap_ImpairmentOfOilAndGasProperties | $ 0 us-gaap_ImpairmentOfOilAndGasProperties
Average Depletion Depreciation and Amortization Expense Per Unit of Production |  |  |  | 35.54 fcx_AverageDepletionDepreciationandAmortizationExpensePerUnitofProduction | 39.74 fcx_AverageDepletionDepreciationandAmortizationExpensePerUnitofProduction |  |  |
[1] | Includes charges of $3.7 billion to reduce the carrying value of oil and gas properties pursuant to full cost accounting rules.

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- Definition The average DD&A expense computed on the basis of physical units, with oil and gas converted to a common unit of measure on the basis of their approximate relative energy content. + References No definition available. + Details
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- Definition Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 + Details
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- Definition The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 + Details
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- Definition Net amount of capitalized costs relating to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370743&loc=d3e66150-109466 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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