XML 59 R42.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Contingencies and Commitments (Unaudited) Mining Contract (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jul. 31, 2018 | Jun. 30, 2018
Contractual Obligations Mining Contracts [Line Items] |  |
Term to construct smelter |  | 5 years
PT Freeport Indonesia [Member] |  |
Contractual Obligations Mining Contracts [Line Items] |  |
Divestment percentage |  | 51.00%
PT Indocopper Investama [Member] | PT Freeport Indonesia [Member] |  |
Contractual Obligations Mining Contracts [Line Items] |  |
Investment Owned, Percent of Net Assets |  | 9.36%
Pt Smelting [Member] | PT Freeport Indonesia [Member] |  |
Contractual Obligations Mining Contracts [Line Items] |  |
Investment Owned, Percent of Net Assets |  | 25.00%
Subsequent Event [Member] | PT Freeport Indonesia [Member] |  |
Contractual Obligations Mining Contracts [Line Items] |  |
Ownership interest by parent subsequent to business acquisition, pending | 49.00% |
Proceeds from divestiture of businesses, pending | $ 350 |
Subsequent Event [Member] | Rio Tinto [Member] | Rio Tinto Share In Joint Venture [Member] |  |
Contractual Obligations Mining Contracts [Line Items] |  |
Proceeds from divestiture of businesses, pending | $ 3,500 |
Interest In PT Indocopper Investama [Member] | Subsequent Event [Member] | PT Indonesia Asahan Aluminium (Persero) (Inalum) [Member] |  |
Contractual Obligations Mining Contracts [Line Items] |  |
Ownership percentage pending acquired | 9.36% |
Rio Tinto Share In Joint Venture [Member] | Subsequent Event [Member] | PT Indonesia Asahan Aluminium (Persero) (Inalum) [Member] |  |
Contractual Obligations Mining Contracts [Line Items] |  |
Cash consideration in a pending business combination | $ 3,850 |
PT Freeport Indonesia [Member] | Subsequent Event [Member] | PT Indonesia Asahan Aluminium (Persero) (Inalum) [Member] |  |
Contractual Obligations Mining Contracts [Line Items] |  |
Ownership percentage pending acquired | 40.00% |
Ownership interest subsequent to acquisition, pending | 51.00% |

X
- Definition Business Acquisition, Percentage of Voting Interests Acquired, Pending + References No definition available. + Details
Name: | fcx_BusinessAcquisitionPercentageofVotingInterestsAcquiredPending
Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Business Combination, Consideration Transferred, Pending + References No definition available. + Details
Name: | fcx_BusinessCombinationConsiderationTransferredPending
Namespace Prefix: | fcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage, Pending + References No definition available. + Details
Name: | fcx_BusinessCombinationStepAcquisitionEquityInterestinAcquireeIncludingSubsequentAcquisitionPercentagePending
Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | fcx_ContractualObligationsMiningContractsLineItems
Namespace Prefix: | fcx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Divestment percentage of project area to Indonesian participants. + References No definition available. + Details
Name: | fcx_Divestmentpercentage
Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Noncontrolling Interest, Ownership Percentage by Parent, Pending + References No definition available. + Details
Name: | fcx_NoncontrollingInterestOwnershipPercentagebyParentPending
Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proceeds from Divestiture of Businesses, Net of Cash Divested, Pending + References No definition available. + Details
Name: | fcx_ProceedsfromDivestitureofBusinessesNetofCashDivestedPending
Namespace Prefix: | fcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term to construct smelter. + References No definition available. + Details
Name: | fcx_Termtoconstructsmelter
Namespace Prefix: | fcx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=63488139&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.3) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column D.2) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 + Details
Name: | us-gaap_InvestmentOwnedPercentOfNetAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=fcx_PtFreeportIndonesiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fcx_PTIndocopperInvestamaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fcx_PtSmeltingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fcx_RioTintoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=fcx_RioTintoShareInJointVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=fcx_InterestInPTIndocopperInvestamaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fcx_PTIndonesiaAsahanAluminiumPerseroInalumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=fcx_RioTintoShareInJointVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=fcx_PtFreeportIndonesiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |