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Subsequent Events (Unaudited) (Details) (PT Freeport Indonesia [Member], USD $) In Millions, unless otherwise specified | 6 Months Ended | 3 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2014 | Sep. 30, 2014 Subsequent Event [Member] | Jul. 25, 2014 Subsequent Event [Member] | Sep. 30, 2014 Maximum [Member] Subsequent Event [Member] | Sep. 30, 2014 Minimum [Member] Subsequent Event [Member] | Sep. 30, 2014 Stage 1 [Member] Subsequent Event [Member] | Sep. 30, 2014 Stage 2 [Member] Subsequent Event [Member] | Sep. 30, 2014 Stage 3 [Member] Subsequent Event [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Effective Date, Memorandum of Understanding with Foreign Government |  | Jul. 25, 2014 |  |  |  |  |  |
Expiration Date, Contract of Work |  | Dec. 31, 2021 |  |  |  |  |  |
Percent Of Undivided Interest Owned By Third Party |  |  | 30.00% |  |  |  |  |
Incremental Percent of Undivided Interest Owned by Third Party |  |  | 20.64% |  |  |  |  |
Date, Contract of Work Extension |  |  |  | Dec. 31, 2041 | Jan. 01, 2022 |  |  |
Contract of Work Negotiations, Term |  | 0 years 6 months |  |  |  |  |  |
Assurance Bond, Smelter Development |  | $ 115 |  |  |  |  |  |
Copper Royalty Rate | 3.50% | 4.00% |  |  |  |  |  |
Gold Royalty Rate | 1.00% | 3.75% |  |  |  |  |  |
Progressive Export Duty on Copper Concentrates, Percent |  |  |  |  |  | 7.50% | 5.00% | 0.00%
Smelter Development Progress, Percent |  |  |  |  |  |  | 7.50% | 30.00%

X
- Definition Amount of assurance bond provided for smelter development. + References No definition available. + Details
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Balance Type: | debit
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X
- Definition Term of the contract of work negotiations, in 'PnYnMnDTnHnMnS' 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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Balance Type: | na
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X
- Definition The copper royalty rate of net revenues payable. + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Dates of Contract of Work extension. + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The date that a Memorandum of Understanding with was entered into with a foreign government. + References No definition available. + Details
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Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date that contract of work between the company and the local government expires in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition The royalty rate for gold and silver sales under the Contract of Work. + References No definition available. + Details
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Namespace Prefix: | fcx_
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Balance Type: | na
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- Definition The incremental percentage of undivided interest owned by a third party. + References No definition available. + Details
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Period Type: | instant

X
- Definition The percentage of undivided interest owned by a third party. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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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X
- Definition Progress of smelter development expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | fcx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
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