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New Accounting Standard (Unaudited) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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New Accounting Standards [Abstract] |  |
Unamortized Debt Issuance Expense | $ 122 us-gaap_UnamortizedDebtIssuanceExpense | $ 121 us-gaap_UnamortizedDebtIssuanceExpense

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- Details
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Namespace Prefix: | fcx_
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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