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v2.4.1.9

OTHER LIABILITIES, INCLUDING EMPLOYEE BENEFITS (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Employee Benefits [Line Items] |  |  |  |  |
Defined Benefit Plan, Vesting Period | 5 years |  |  |  |
Pension, postretirement, postemployment and other employment benefits | $ 1,430 us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent | [1] | $ 1,225 us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent | [1] |
Commodity derivative contracts | 99 us-gaap_DerivativeLiabilities |  | 320 us-gaap_DerivativeLiabilities |  |
Reserve for uncertain tax benefits | 68 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent |  | 87 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent |  |
Other | 363 us-gaap_OtherSundryLiabilitiesNoncurrent |  | 263 us-gaap_OtherSundryLiabilitiesNoncurrent |  |
Total other liabilities | 1,861 us-gaap_OtherLiabilitiesNoncurrent |  | 1,690 us-gaap_OtherLiabilitiesNoncurrent |  |
Number of years Mercer Pension Discount Curve consists of spot interest rates at half-year increments | 30 years |  |  |  |
Years of service required for annuity to equal percentage of executive's highest average compensation for any consecutive three-year period during the preceeding five years before retirement | 25 years |  |  |  |
Estimated future average expected rate of return per annum on pension assets | 7.25%fcx_DefinedBenefitPlanEstimatedFutureExpectedReturnOnPlanAssetsPercentage |  |  |  |
Estimated future average expected rate of return on passively managed pension assets | 6.75%fcx_DefinedBenefitPlanEstimatedFutureExpectedReturnOnPlanAssetsPassivelyManaged |  |  |  |
Estimated future average expected premium on actively managed pension assets | 0.50%fcx_DefinedBenefitPlanEstimatedFutureExpectedReturnOnPlanAssetsActivelyManaged |  |  |  |
Accumulated benefit obligations in excess of plan assets [Abstract] |  |  |  |  |
Projected benefit obligation | 2,221 us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation |  | 2,180 us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation |  |
Accumulated benefit obligation | 2,090 us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation |  | 1,933 us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation |  |
Fair value of plan assets | 1,433 us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets |  | 1,490 us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets |  |
Balance of unfunded defined contribution plan | 69 fcx_BalanceOfUnfundedDefinedContributionPlan |  | 65 fcx_BalanceOfUnfundedDefinedContributionPlan |  |
Costs charged to operations for employee savings plans and defined contribution plans | 79 us-gaap_DefinedContributionPlanCostRecognized |  | 66 us-gaap_DefinedContributionPlanCostRecognized |  | 43 us-gaap_DefinedContributionPlanCostRecognized
Costs capitalized to oil and gas properties for employee savings plans and defined benefit contribution plans | 11 fcx_DefinedContributionPlanCostCapitalized |  | 5 fcx_DefinedContributionPlanCostCapitalized |  |
Other Liabilities [Member] |  |  |  |  |
Employee Benefits [Line Items] |  |  |  |  |
Commodity derivative contracts | $ 0 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember |  | $ 115 us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember |  |
[1] | Refer to Note 7 for current portion.

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- Definition The portion of the expected long-term rate of return on plan assets due to active management of the portfolio. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for defined benefit plans, in 'PnYnMnDTnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Defined Benefit Plan Years Mercer Pension Discount Curve Consists Of Spot Interest Rates At Half Year Increments + References No definition available. + Details
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- Definition Years Of Service Required For Annuity To Equal Percentage Of Executive Highest Average Compensation For Three Year Period Or Five Years Before Retirement If Less + References No definition available. + Details
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- Definition If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=34716465&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=34716465&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=34716465&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 + Details
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