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CONTINGENCIES (Environmental Obligations) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |  |
Balance at beginning of year | $ 1,167,000,000 us-gaap_AccrualForEnvironmentalLossContingencies |  | $ 1,222,000,000 us-gaap_AccrualForEnvironmentalLossContingencies |  | $ 1,453,000,000 us-gaap_AccrualForEnvironmentalLossContingencies |
Accretion Expense | 77,000,000 us-gaap_AccretionExpense | [1] | 79,000,000 us-gaap_AccretionExpense | [1] | 80,000,000 us-gaap_AccretionExpense | [1]
Additions | 16,000,000 us-gaap_AccrualForEnvironmentalLossContingenciesProvisionForNewLosses |  | 73,000,000 us-gaap_AccrualForEnvironmentalLossContingenciesProvisionForNewLosses |  | 70,000,000 us-gaap_AccrualForEnvironmentalLossContingenciesProvisionForNewLosses |
Reductions | (6,000,000)us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates | [2] | (77,000,000)us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates | [2] | (182,000,000)us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates | [2]
Spending | (80,000,000)us-gaap_AccrualForEnvironmentalLossContingenciesPayments |  | (130,000,000)us-gaap_AccrualForEnvironmentalLossContingenciesPayments |  | (199,000,000)us-gaap_AccrualForEnvironmentalLossContingenciesPayments |
Balance at end of year | 1,174,000,000 us-gaap_AccrualForEnvironmentalLossContingencies |  | 1,167,000,000 us-gaap_AccrualForEnvironmentalLossContingencies |  | 1,222,000,000 us-gaap_AccrualForEnvironmentalLossContingencies |
Less current portion | (105,000,000)us-gaap_AccruedEnvironmentalLossContingenciesCurrent |  | (121,000,000)us-gaap_AccruedEnvironmentalLossContingenciesCurrent |  | (186,000,000)us-gaap_AccruedEnvironmentalLossContingenciesCurrent |
Long-term portion | 1,069,000,000 us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent |  | 1,046,000,000 us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent |  | 1,036,000,000 us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent |
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract] |  |  |  |  |  |
2015 | 105,000,000 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear |  |  |  |  |
2016 | 151,000,000 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear |  |  |  |  |
2017 | 120,000,000 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear |  |  |  |  |
2018 | 108,000,000 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear |  |  |  |  |
2019 | 79,000,000 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear |  |  |  |  |
Thereafter | 1,800,000,000 us-gaap_AccrualForEnvironmentalLossContingenciesUndiscountedDueAfterFifthYear |  |  |  |  |
Estimated Environmental Obligations on a Discounted Fair Value Basis | 1,100,000,000 fcx_EstimatedDiscountedAtFairValueEnvironmentalObligations |  |  |  |  |
Estimated Environmental Obligations on an Undiscounted and Unescalated Basis | 2,400,000,000 fcx_EstimatedUndiscountedAndUnescalatedEnvironmentalObligations |  |  |  |  |
Recorded environmental obligations for most significant sites | 1,000,000,000 fcx_RecordedEnvironmentalObligationForMostSignificantLocations |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract] |  |  |  |  |  |
Estimated Environmental Obligations on an Undiscounted and Unescalated Basis | 2,000,000,000 fcx_EstimatedUndiscountedAndUnescalatedEnvironmentalObligations / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract] |  |  |  |  |  |
Estimated Environmental Obligations on an Undiscounted and Unescalated Basis | $ 2,600,000,000 fcx_EstimatedUndiscountedAndUnescalatedEnvironmentalObligations / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
[1] | Represents accretion of the fair value of environmental obligations assumed in the 2007 acquisition of FMC, which were determined on a discounted cash flow basis.
[2] | Reductions primarily reflect revisions for changes in the anticipated scope and timing of projects and other noncash adjustments.

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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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- Definition The Increase or Decrease in the accrual for environmental loss in the period from revisions in estimates to existing obligations. The amount does not relate to changes in the environmental accrual related to business acquisitions or divestitures, or to currency movements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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