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SUBSEQUENT EVENTS Subsequent Events (Details) | Feb. 06, 2018 $ / shares
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Subsequent Event [Member] |
Subsequent Event [Line Items] |
AuthorizedQuarterlyRateOfCommonStockDividend | $ 0.05

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- Definition Authorized quarterly rate of common stock dividend paid in cash. + References No definition available. + Details
Name: | fcx_AuthorizedQuarterlyRateOfCommonStockDividend
Namespace Prefix: | fcx_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |