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BUSINESS SEGMENTS (Product Revenue) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 5,235 us-gaap_SalesRevenueNet | [1] | $ 5,696 us-gaap_SalesRevenueNet | [1] | $ 5,522 us-gaap_SalesRevenueNet | [1] | $ 4,985 us-gaap_SalesRevenueNet | [1] | $ 5,885 us-gaap_SalesRevenueNet | [2] | $ 6,165 us-gaap_SalesRevenueNet | [2] | $ 4,288 us-gaap_SalesRevenueNet | [2] | $ 4,583 us-gaap_SalesRevenueNet | $ 21,438 us-gaap_SalesRevenueNet | [1],[3] | $ 20,921 us-gaap_SalesRevenueNet | [2],[3] | $ 18,010 us-gaap_SalesRevenueNet | [3]
Treatment and refining charges included in copper concentrates revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 374 fcx_TreatmentAndRefiningChargesIncludedInCopperConcentratesRevenues |  | 400 fcx_TreatmentAndRefiningChargesIncludedInCopperConcentratesRevenues |  | 311 fcx_TreatmentAndRefiningChargesIncludedInCopperConcentratesRevenues |
Refined Copper Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,451 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_RefinedCopperProductsMember |  | 9,178 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_RefinedCopperProductsMember |  | 9,699 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_RefinedCopperProductsMember |
Copper in concentrates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,366 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_CopperInConcentratesMember | [4] | 5,328 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_CopperInConcentratesMember | [4] | 4,589 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_CopperInConcentratesMember | [4]
Gold [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,584 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_GoldMember |  | 1,656 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_GoldMember |  | 1,741 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_GoldMember |
Molybdenum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,207 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_MolybdenumMember |  | 1,110 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_MolybdenumMember |  | 1,187 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_MolybdenumMember |
Oil [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,233 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_OilReservesMember |  | 2,310 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_OilReservesMember |  | 0 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_OilReservesMember |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,597 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_OtherProductsOrServicesMember |  | $ 1,339 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_OtherProductsOrServicesMember |  | $ 794 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = fcx_OtherProductsOrServicesMember |
[1] | Includes credits (charges) of $15 million ($9 million to net income attributable to common stockholders or $0.01 per share) in the first quarter, $(7) million ($(4) million to net income attributable to common stockholders) in the second quarter, $122 million ($76 million to net income attributable to common stockholders or $0.07 per share) in the third quarter, $497 million ($309 million to net loss attributable to common stockholders or $0.30 per share) in the fourth quarter and $627 million ($389 million to net loss attributable to common stockholders or $0.37 per share) for the year for net unrealized and noncash realized gains (losses) on crude oil and natural gas derivative contracts.
[2] | Includes charges of $36 million ($23 million to net income attributable to common stockholders or $0.02 per share) in the second quarter, $158 million ($98 million to net income attributable to common stockholders or $0.09 per share) in the third quarter, $118 million ($73 million to net income attributable to common stockholders or $0.07 per share) in the fourth quarter and $312 million ($194 million to net income attributable to common stockholders or $0.19 per share) for the year (reflecting the seven-month period from June 1, 2013, to December 31, 2013) for unrealized and noncash realized losses on crude oil and natural gas derivative contracts.
[3] | Revenues are attributed to countries based on the location of the customer.
[4] | Amounts are net of treatment and refining charges totaling $374 million for 2014, $400 million for 2013 and $311 million for 2012.

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