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Guarantor Financial Statements (Unaudited) (Details) (FM O&G LLC Guarantor [Member]) | Mar. 31, 2015
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FM O&G LLC Guarantor [Member] |
Debt Instrument [Line Items] |
Noncontrolling Interest, Ownership Percentage by Parent | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember

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

X
- 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