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Guarantor Financial Statements (Unaudited) (Details) | Jun. 30, 2015
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FM O&G LLC Guarantor [Member] |
Debt Instrument [Line Items] |
Noncontrolling Interest, Ownership Percentage by Parent | 100.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=fcx_FreeportMcMoRanOilGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |