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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) Mill and Leach Stockpiles (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Mill and Leach Stockpiles [Line Items] |  |  |  |
Current mill and leach stockpiles | $ 1,713 |  | $ 1,672 |
Total long-term mill and leach stockpiles | 2,192 |  | 1,955 |
Current [Member] |  |  |  |
Mill and Leach Stockpiles [Line Items] |  |  |  |
Mill Stockpiles | 94 |  | 104 |
Leach stockpiles | 1,619 |  | 1,568 |
Current mill and leach stockpiles | 1,713 |  | 1,672 |
Long-Term [Member] |  |  |  |
Mill and Leach Stockpiles [Line Items] |  |  |  |
Mill Stockpiles | 649 | [1] | 615 | [1]
Leach stockpiles | 1,543 | [1] | 1,340 | [1]
Total long-term mill and leach stockpiles | $ 2,192 | [1] | $ 1,955 | [1]
[1] | Metals in stockpiles not expected to be recovered within the next 12 months.

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- Definition Stockpile inventories not expected to be converted to cash, sold or exchanged within one year (or the normal operating cycle, if longer). + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Carrying amount (lower of cost or market) as of the balance sheet date of stockpile inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer). + References No definition available. + Details
Name: | fcx_MillAndLeachStockpiles
Namespace Prefix: | fcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | fcx_MillAndLeachStockpilesLineItems
Namespace Prefix: | fcx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount (lower of cost or market) as of the balance sheet date of mill stockpile inventories less all valuation and other allowances. + References No definition available. + Details
Name: | fcx_MillStockpiles
Namespace Prefix: | fcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before last-in first-out (LIFO) and valuation reserves of ore stockpile material contained on a leach pad, for example, but not limited to, copper or gold ore. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant