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Subsequent Events (Unaudited) (Details) - PT Freeport Indonesia [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 | Sep. 30, 2015 | Jun. 30, 2015
Subsequent Event [Line Items] |  |  |
Assurance Bond, Smelter Development |  |  | $ 115
Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Progressive Export Duty on Copper Concentrates, Percent |  | 5.00% |
Expiration Date, Memorandum of Understanding with Foreign Government |  | Jul. 25, 2015 |
Export Permit Renewal Term |  | 6 months |
Expiration Date, Export Permit | Jan. 28, 2016 |  |
Effective Date, Export Permit |  | Jul. 29, 2015 |
Stage 1 [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Progressive Export Duty on Copper Concentrates, Percent |  |  | 7.50%
Stage 2 [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Progressive Export Duty on Copper Concentrates, Percent |  |  | 5.00%
Smelter Development Progress, Percent |  |  | 7.50%
Stage 3 [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Progressive Export Duty on Copper Concentrates, Percent |  |  | 0.00%
Smelter Development Progress, Percent |  |  | 30.00%

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- Definition Amount of assurance bond provided for smelter development. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The date that an export permit was entered into or renewed with a foreign government. + References No definition available. + Details
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Namespace Prefix: | fcx_
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Balance Type: | na
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X
- Definition The date that an export permit with a foreign government expires or must by renewed by. + References No definition available. + Details
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Balance Type: | na
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X
- Definition The date that a Memorandum of Understanding with a foreign government expires or must be renewed by. + References No definition available. + Details
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- Definition Duration of time an export permit is valid before needing renewal. + References No definition available. + Details
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- Definition The progressive export duty on copper concentrates expressed as a percentage. + References No definition available. + Details
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Balance Type: | na
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- Definition Progress of smelter development expressed as a percentage. + References No definition available. + Details
Name: | fcx_SmelterDevelopmentProgressPercent
Namespace Prefix: | fcx_
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Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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