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Guarantor Financial Statements (Unaudited) Condensed Consolidating Statements of Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Revenues | $ 4,153 us-gaap_SalesRevenueNet |  | $ 4,985 us-gaap_SalesRevenueNet
Total costs and expenses | 7,116 us-gaap_CostsAndExpenses |  | 3,874 us-gaap_CostsAndExpenses
Operating (loss) income | (2,963)us-gaap_OperatingIncomeLoss |  | 1,111 us-gaap_OperatingIncomeLoss
Interest expense, net | (146)fcx_InterestExpenseIncludingAccretion |  | (161)fcx_InterestExpenseIncludingAccretion
Other income (expense), net | 7 us-gaap_NonoperatingIncomeExpense |  | 33 us-gaap_NonoperatingIncomeExpense
(Loss) income before income taxes and equity in affiliated companies' net earnings | (3,102)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 983 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Benefit from (provision for) income taxes | 695 us-gaap_IncomeTaxExpenseBenefit |  | (357)us-gaap_IncomeTaxExpenseBenefit
Equity in affiliated companies' net (losses) earnings | 1 us-gaap_IncomeLossFromEquityMethodInvestments |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments
Net (loss) income | (2,406)us-gaap_ProfitLoss |  | 626 us-gaap_ProfitLoss
Net income and preferred dividends attributable to noncontrolling interests | (68)fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends |  | (116)fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends
Net (loss) income attributable to common stockholders | (2,474)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 510 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Other comprehensive income (loss) | 12 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  | 3 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Total comprehensive (loss) income | (2,462)us-gaap_ComprehensiveIncomeNetOfTax |  | 513 us-gaap_ComprehensiveIncomeNetOfTax
Impairment of oil and gas properties | 3,104 us-gaap_ImpairmentOfOilAndGasProperties |  | 0 us-gaap_ImpairmentOfOilAndGasProperties
FCX Issuer [Member] |  |  |
Revenues | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total costs and expenses | 16 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 11 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating (loss) income | (16)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (11)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense, net | (115)fcx_InterestExpenseIncludingAccretion / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (82)fcx_InterestExpenseIncludingAccretion / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income (expense), net | 29 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 20 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Loss) income before income taxes and equity in affiliated companies' net earnings | (102)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (73)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Benefit from (provision for) income taxes | (421)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (21)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in affiliated companies' net (losses) earnings | (1,951)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 604 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net (loss) income | (2,474)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 510 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income and preferred dividends attributable to noncontrolling interests | 0 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net (loss) income attributable to common stockholders | (2,474)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 510 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other comprehensive income (loss) | 12 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 3 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total comprehensive (loss) income | (2,462)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 513 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Impairment of oil and gas properties | 0 us-gaap_ImpairmentOfOilAndGasProperties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
FM O&G LLC Guarantor [Member] |  |  |
Revenues | 181 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  | 644 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
Total costs and expenses | 1,318 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember | [1] | 526 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
Operating (loss) income | (1,137)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  | 118 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
Interest expense, net | (4)fcx_InterestExpenseIncludingAccretion / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  | (41)fcx_InterestExpenseIncludingAccretion / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
Other income (expense), net | 0 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  | 0 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
(Loss) income before income taxes and equity in affiliated companies' net earnings | (1,141)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  | 77 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
Benefit from (provision for) income taxes | 1,157 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  | (43)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
Equity in affiliated companies' net (losses) earnings | (2,359)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  | 130 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
Net (loss) income | (2,343)us-gaap_ProfitLoss / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  | 164 us-gaap_ProfitLoss / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
Net income and preferred dividends attributable to noncontrolling interests | 0 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  | 0 fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
Net (loss) income attributable to common stockholders | (2,343)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  | 164 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
Other comprehensive income (loss) | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
Total comprehensive (loss) income | (2,343)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  | 164 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember
Impairment of oil and gas properties | 1,062 us-gaap_ImpairmentOfOilAndGasProperties / dei_LegalEntityAxis = fcx_FreeportMcMoRanOilGasMember |  |
Non-Guarantor Subsidiaries [Member] |  |  |
Revenues | 3,972 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 4,341 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Total costs and expenses | 5,798 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | [1] | 3,339 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Operating (loss) income | (1,826)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 1,002 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Interest expense, net | (57)fcx_InterestExpenseIncludingAccretion / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (58)fcx_InterestExpenseIncludingAccretion / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other income (expense), net | 8 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 33 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
(Loss) income before income taxes and equity in affiliated companies' net earnings | (1,875)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 977 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Benefit from (provision for) income taxes | (35)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (292)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Equity in affiliated companies' net (losses) earnings | (3,530)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 185 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net (loss) income | (5,440)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 870 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net income and preferred dividends attributable to noncontrolling interests | (56)fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | (111)fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net (loss) income attributable to common stockholders | (5,496)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 759 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other comprehensive income (loss) | 12 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 3 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Total comprehensive (loss) income | (5,484)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  | 762 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Impairment of oil and gas properties | 2,042 us-gaap_ImpairmentOfOilAndGasProperties / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Eliminations [Member] |  |  |
Revenues | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Total costs and expenses | (16)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (2)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Operating (loss) income | 16 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 2 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Interest expense, net | 30 fcx_InterestExpenseIncludingAccretion / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 20 fcx_InterestExpenseIncludingAccretion / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Other income (expense), net | (30)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (20)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
(Loss) income before income taxes and equity in affiliated companies' net earnings | 16 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | 2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Benefit from (provision for) income taxes | (6)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (1)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Equity in affiliated companies' net (losses) earnings | 7,841 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (919)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net (loss) income | 7,851 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (918)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net income and preferred dividends attributable to noncontrolling interests | (12)fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (5)fcx_NetIncomeLossAttributabletoNoncontrollingInterestsandPreferredDividends / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net (loss) income attributable to common stockholders | 7,839 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (923)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Other comprehensive income (loss) | (12)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (3)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Total comprehensive (loss) income | 7,827 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  | (926)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Impairment of oil and gas properties | $ 0 us-gaap_ImpairmentOfOilAndGasProperties / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
[1] | Includes impairment charges totaling $1.1 billion at the FM O&G LLC guarantor and $2.0 billion at the non-guarantor subsidiaries related to ceiling test impairment charges for FCX's oil and gas properties pursuant to full cost accounting rules.

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