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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Stock Award Plans) (Details) (2006 stock incentive plan [Member])
In Millions, unless otherwise specified
Dec. 31, 2014
2006 stock incentive plan [Member]
 
Award Detail [Line Items]  
Number of common shares available for issuance under each of the stock award plans 74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ fcx_StockAwardPlanByPlanAxis
= fcx_StockIncentivePlan2006Member
Number of shares available for grant 19.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ fcx_StockAwardPlanByPlanAxis
= fcx_StockIncentivePlan2006Member