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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Components of Inventories [Line Items] |  |  |  |
Raw materials (primarily concentrates) | $ 272 us-gaap_InventoryRawMaterials |  | $ 288 us-gaap_InventoryRawMaterials |
Work-in-process | 158 us-gaap_InventoryWorkInProcess |  | 174 us-gaap_InventoryWorkInProcess |
Finished goods | 1,012 us-gaap_InventoryFinishedGoods |  | 1,099 us-gaap_InventoryFinishedGoods |
Total product inventories | 1,442 fcx_Product |  | 1,561 fcx_Product |
Total mill and leach stockpiles | 1,877 fcx_MillAndLeachStockpiles |  | 1,914 fcx_MillAndLeachStockpiles |
Total materials and supplies, net | 1,919 us-gaap_InventorySuppliesNetOfReserves | [1] | 1,886 us-gaap_InventorySuppliesNetOfReserves | [1]
Total long-term mill and leach stockpiles | 2,261 fcx_LongTermMillAndLeachStockpiles |  | 2,179 fcx_LongTermMillAndLeachStockpiles |
Inventory obsolescence reserves | 21 us-gaap_InventoryValuationReserves |  | 20 us-gaap_InventoryValuationReserves |
Current [Member] |  |  |  |
Components of Inventories [Line Items] |  |  |  |
Mill stockpiles | 101 fcx_MillStockpiles / us-gaap_PublicUtilitiesInventoryAxis = fcx_CurrentMember |  | 86 fcx_MillStockpiles / us-gaap_PublicUtilitiesInventoryAxis = fcx_CurrentMember |
Leach stockpiles | 1,776 us-gaap_InventoryOreStockpilesOnLeachPads / us-gaap_PublicUtilitiesInventoryAxis = fcx_CurrentMember |  | 1,828 us-gaap_InventoryOreStockpilesOnLeachPads / us-gaap_PublicUtilitiesInventoryAxis = fcx_CurrentMember |
Total mill and leach stockpiles | 1,877 fcx_MillAndLeachStockpiles / us-gaap_PublicUtilitiesInventoryAxis = fcx_CurrentMember |  | 1,914 fcx_MillAndLeachStockpiles / us-gaap_PublicUtilitiesInventoryAxis = fcx_CurrentMember |
Long-Term [Member] |  |  |  |
Components of Inventories [Line Items] |  |  |  |
Mill stockpiles | 346 fcx_MillStockpiles / us-gaap_PublicUtilitiesInventoryAxis = fcx_LongTermMember |  | 360 fcx_MillStockpiles / us-gaap_PublicUtilitiesInventoryAxis = fcx_LongTermMember |
Leach stockpiles | 1,915 us-gaap_InventoryOreStockpilesOnLeachPads / us-gaap_PublicUtilitiesInventoryAxis = fcx_LongTermMember |  | 1,819 us-gaap_InventoryOreStockpilesOnLeachPads / us-gaap_PublicUtilitiesInventoryAxis = fcx_LongTermMember |
Total long-term mill and leach stockpiles | $ 2,261 fcx_LongTermMillAndLeachStockpiles / us-gaap_PublicUtilitiesInventoryAxis = fcx_LongTermMember | [2] | $ 2,179 fcx_LongTermMillAndLeachStockpiles / us-gaap_PublicUtilitiesInventoryAxis = fcx_LongTermMember | [2]
[1] | Materials and supplies inventory was net of obsolescence reserves totaling $21 million at March 31, 2015, and $20 million at December 31, 2014.
[2] | Estimated metals in stockpiles not expected to be recovered within the next 12 months.

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