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SUBSEQUENT EVENTS (Details) (USD $)
Dec. 31, 2014
Feb. 27, 2015
Subsequent Event [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Year Two $ 651,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,500,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
Long-term Debt, Maturities, Repayments of Principal in Year Four 3,700,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
Long-term Debt, Maturities, Repayments of Principal in Year Five 662,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Long-term Debt, Maturities, Repayments of Principal after Year Five 11,800,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Bank Term Loan [Member]    
Subsequent Event [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Year Two 650,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= fcx_BankTermLoanMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Three 200,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= fcx_BankTermLoanMember
 
Long-term Debt, Maturities, Repayments of Principal in Year Four 2,200,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= fcx_BankTermLoanMember
 
Bank Term Loan [Member] | Subsequent Event [Member]    
Subsequent Event [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Year Two   225,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= fcx_BankTermLoanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Long-term Debt, Maturities, Repayments of Principal in Year Three   269,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= fcx_BankTermLoanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Long-term Debt, Maturities, Repayments of Principal in Year Four   1,100,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= fcx_BankTermLoanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Long-term Debt, Maturities, Repayments of Principal in Year Five   299,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_LongtermDebtTypeAxis
= fcx_BankTermLoanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Long-term Debt, Maturities, Repayments of Principal after Year Five   $ 1,200,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_LongtermDebtTypeAxis
= fcx_BankTermLoanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember