XML 128 R68.htm IDEA: XBRL DOCUMENT v2.4.1.9
OTHER LIABILITIES, INCLUDING EMPLOYEE BENEFITS (Schedule of FV of Financial Assets for Pension Plans) (Details) (Pension plan [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
FCX [Member]
      
Fair value of plan assets measurement [Line items]      
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Cash and Receivables In Plan Assets 19fcx_CashAndReceivablesInPlanAssets
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Payables In Plan Assets (9)fcx_PayablesInPlanAssets
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PT Freeport Indonesia [Member]
      
Fair value of plan assets measurement [Line items]      
Defined Benefit Plan, Fair Value of Plan Assets 185us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Cash and Receivables In Plan Assets 101fcx_CashAndReceivablesInPlanAssets
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Investments [Member] | FCX [Member]      
Fair value of plan assets measurement [Line items]      
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Fair value of plan assets measurement [Line items]      
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Fair value of plan assets measurement [Line items]      
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Fair value of plan assets measurement [Line items]      
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Investments [Member] | PT Freeport Indonesia [Member] | Government bonds [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of plan assets measurement [Line items]      
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Investments [Member] | PT Freeport Indonesia [Member] | Common stocks [Member]      
Fair value of plan assets measurement [Line items]      
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Investments [Member] | PT Freeport Indonesia [Member] | Common stocks [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of plan assets measurement [Line items]      
Defined Benefit Plan, Fair Value of Plan Assets 43us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Investments [Member] | PT Freeport Indonesia [Member] | Common stocks [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of plan assets measurement [Line items]      
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Investments [Member] | PT Freeport Indonesia [Member] | Common stocks [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of plan assets measurement [Line items]      
Defined Benefit Plan, Fair Value of Plan Assets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Investments [Member] | PT Freeport Indonesia [Member] | Mutual funds [Member]      
Fair value of plan assets measurement [Line items]      
Defined Benefit Plan, Fair Value of Plan Assets 14us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Investments [Member] | PT Freeport Indonesia [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of plan assets measurement [Line items]      
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Investments [Member] | PT Freeport Indonesia [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of plan assets measurement [Line items]      
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Investments [Member] | PT Freeport Indonesia [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair value of plan assets measurement [Line items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[1] Cash consists primarily of short-term time deposits.