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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Common Stock) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2013 | Feb. 29, 2012 | Dec. 31, 2014 | Dec. 31, 2014
STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Common Stock) [Abstract] |  |  |  |
Authorized shares of capital stock |  |  | 1,850,000,000 us-gaap_CapitalUnitsAuthorized | 1,850,000,000 us-gaap_CapitalUnitsAuthorized
Authorized shares of common stock |  |  | 1,800,000,000 us-gaap_CommonStockSharesAuthorized | 1,800,000,000 us-gaap_CommonStockSharesAuthorized
Authorized shares of preferred stock |  |  | 50,000,000 us-gaap_PreferredStockSharesAuthorized | 50,000,000 us-gaap_PreferredStockSharesAuthorized
Remaining shares available under open-market share purchase program |  |  |  | 23,700,000 fcx_TreasuryStockOpenMarketPurchaseAcquisitionAuthorizationNumberOfSharesRemainingUnderProgram
Authorized annual rate of common stock dividend (in dollars per share) |  | $ 1.25 fcx_AuthorizedAnnualRateOfCommonStockDividend |  |
Supplemental common stock dividend (in dollars per share) | $ 1.00 fcx_SupplementalCommonStockDividend |  |  |
Authorized quarterly rate of common stock dividend (in dollars per share) |  |  | $ 0.3125 fcx_AuthorizedQuarterlyRateOfCommonStockDividend |
Dividends Payable, Date Declared |  |  | Dec. 19, 2014 |
Dividends Payable, Date to be Paid |  |  | Feb. 02, 2015 |
Dividends Payable, Date of Record |  |  | Jan. 15, 2015 |

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- Definition Annual rate of common stock cash dividend authorized but not yet declared by an entity during the period. + References No definition available. + Details
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- Definition Authorized Quarterly Rate Of Common Stock Dividend + References No definition available. + Details
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Balance Type: | na
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- Details
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- Definition Supplemental common stock cash dividend declared by an entity during the period. This element includes paid and unpaid dividends declared during the period. + References No definition available. + Details
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Period Type: | duration

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- Definition Number of additional shares remaining under share purchase program authorized by an entity's Board of Directors. + References No definition available. + Details
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- Definition Number of authorized capital units or capital shares. This element is relevant to issuers of face-amount certificates and registered investment companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16(a)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
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Period Type: | instant

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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