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INCOME TAXES (Summary of Income Tax Examinations) (Details) | 12 Months Ended
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Dec. 31, 2013
U.S. Federal [Member] |
Income Tax Examination [Line Items] |
Additional Open Years Subject To Income Tax Examination | 2013
Indonesia [Member] |
Income Tax Examination [Line Items] |
Additional Open Years Subject To Income Tax Examination | 2013
Minimum [Member] | U.S. Federal [Member] |
Income Tax Examination [Line Items] |
Income Tax Examination, Year under Examination | 2007
Minimum [Member] | Indonesia [Member] |
Income Tax Examination [Line Items] |
Additional Open Years Subject To Income Tax Examination | 2009
Minimum [Member] | Peru [Member] |
Income Tax Examination [Line Items] |
Income Tax Examination, Year under Examination | 2009
Additional Open Years Subject To Income Tax Examination | 2011
Minimum [Member] | Chile [Member] |
Income Tax Examination [Line Items] |
Income Tax Examination, Year under Examination | 2011
Additional Open Years Subject To Income Tax Examination | 2013
Minimum [Member] | Africa [Member] |
Income Tax Examination [Line Items] |
Income Tax Examination, Year under Examination | 2010
Additional Open Years Subject To Income Tax Examination | 2013
Maximum [Member] | U.S. Federal [Member] |
Income Tax Examination [Line Items] |
Income Tax Examination, Year under Examination | 2012
Maximum [Member] | Indonesia [Member] |
Income Tax Examination [Line Items] |
Additional Open Years Subject To Income Tax Examination | 2010
Maximum [Member] | Peru [Member] |
Income Tax Examination [Line Items] |
Income Tax Examination, Year under Examination | 2010
Additional Open Years Subject To Income Tax Examination | 2013
Maximum [Member] | Chile [Member] |
Income Tax Examination [Line Items] |
Income Tax Examination, Year under Examination | 2012
Maximum [Member] | Africa [Member] |
Income Tax Examination [Line Items] |
Income Tax Examination, Year under Examination | 2012
Period 1 [Member] | Minimum [Member] | Indonesia [Member] |
Income Tax Examination [Line Items] |
Income Tax Examination, Year under Examination | 2005
Period 1 [Member] | Maximum [Member] | Indonesia [Member] |
Income Tax Examination [Line Items] |
Income Tax Examination, Year under Examination | 2008
Period 2 [Member] | Minimum [Member] | Indonesia [Member] |
Income Tax Examination [Line Items] |
Income Tax Examination, Year under Examination | 2011
Period 2 [Member] | Maximum [Member] | Indonesia [Member] |
Income Tax Examination [Line Items] |
Income Tax Examination, Year under Examination | 2012

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- Definition Additional tax years(s) not under income tax examination but still open to statue of limitations for examination. + References No definition available. + Details
Name: | fcx_AdditionalOpenYearsSubjectToIncomeTaxExamination
Namespace Prefix: | fcx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_IncomeTaxExaminationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax year being audited in the income tax examination, in CCYY format. + References No definition available. + Details
Name: | us-gaap_IncomeTaxExaminationYearUnderExamination
Namespace Prefix: | us-gaap_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration