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v3.20.1

General Information (Unaudited) (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($)
General Information [Abstract] |
COVID Response, Idle Facility Costs | $ 22

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- Definition COVID Response, Idle Facility Costs + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | fcx_GeneralInformationAbstract
Namespace Prefix: | fcx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration