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v2.4.1.9

SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Standardized Measure of Future Net Cash Flows) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |
Fair Value Inputs, Discount Rate | 10.00%us-gaap_FairValueInputsDiscountRate |  |  |  |  |  |
Future cash inflows | $ 29,504 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows |  | $ 38,901 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows |  |  |  |
Future production expense | (10,991)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts |  | (12,774)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts |  |  |  |
Future development costs | (6,448)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts | [1] | (6,480)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts | [1] |  |  |
Future income tax expense | (2,487)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense |  | (4,935)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense |  |  |  |
Future net cash flows | 9,578 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows |  | 14,712 us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows |  |  |  |
Discounted at 10% per year | (3,157)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows |  | (5,295)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows |  |  |  |
Standardized Measure | 6,421 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves |  | 9,417 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | [2] | 0 us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves | [2] |
Asset Retirement Obligation | 2,769 us-gaap_AssetRetirementObligation |  | 2,328 us-gaap_AssetRetirementObligation |  | 1,146 us-gaap_AssetRetirementObligation |  | 921 us-gaap_AssetRetirementObligation
Oil and Gas Operations Segment [Member] |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |
Asset Retirement Obligation | $ 1,800 us-gaap_AssetRetirementObligation / us-gaap_StatementBusinessSegmentsAxis = fcx_OilAndGasOperationsSegmentMember |  | $ 1,800 us-gaap_AssetRetirementObligation / us-gaap_StatementBusinessSegmentsAxis = fcx_OilAndGasOperationsSegmentMember |  |  |  |
Crude Oil and NGL [Member] |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |
Realized Sales Prices Used in Reserve Reports | 93.20 fcx_RealizedSalesPricesUsedinReserveReports / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_CrudeOilAndNGLPerBarrelMember |  |  |  |  |  |
Natural Gas [Member] |  |  |  |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |  |  |  |
Realized Sales Prices Used in Reserve Reports | 4.35 fcx_RealizedSalesPricesUsedinReserveReports / us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis = us-gaap_NaturalGasReservesMember |  |  |  |  |  |
[1] | Includes estimated asset retirement costs of $1.8 billion at December 31, 2014 and 2013.
[2] | Includes the results of FM O&G beginning June 1, 2013.

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