XML 77 R109.htm IDEA: XBRL DOCUMENT v2.4.1.9
SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Details)
 12 Months Ended
Dec. 31, 2014
Feb. 20, 2015
California [Member]    
Oil and Gas In Process Activities [Line Items]    
Total Reserve Volumes Subject to Reference Price Differential Quality Adjustments, Percentage 39.00%fcx_TotalReserveVolumesSubjecttoReferencePriceDifferentialQualityAdjustmentsPercentage
/ us-gaap_StatementGeographicalAxis
= stpr_CA		  
Gulf of Mexico [Member]    
Oil and Gas In Process Activities [Line Items]    
Total Reserve Volumes Subject to Reference Price Differential Quality Adjustments, Percentage 35.00%fcx_TotalReserveVolumesSubjecttoReferencePriceDifferentialQualityAdjustmentsPercentage
/ us-gaap_StatementGeographicalAxis
= fcx_GulfofMexicoMember		  
Natural Gas [Member]    
Oil and Gas In Process Activities [Line Items]    
Average Sales Prices 4.35us-gaap_AverageSalesPrices
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_NaturalGasReservesMember		  
Crude Oil [Member]    
Oil and Gas In Process Activities [Line Items]    
Average Sales Prices 94.99us-gaap_AverageSalesPrices
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_CrudeOilMember		  
Subsequent Event [Member] | Natural Gas [Member]    
Oil and Gas In Process Activities [Line Items]    
Average Sales Prices   4.04us-gaap_AverageSalesPrices
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_NaturalGasReservesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event [Member] | Crude Oil [Member]    
Oil and Gas In Process Activities [Line Items]    
Average Sales Prices   87.12us-gaap_AverageSalesPrices
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_CrudeOilMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember