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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Components of Inventories [Line Items] |  |  |  |
Raw materials (primarily concentrates) | $ 247 |  | $ 238 |
Work-in-process | 188 | [1] | 199 | [1]
Finished goods | 1,269 | [2] | 1,146 | [2]
Total product inventories | 1,704 |  | 1,583 |
Mill and leach stockpiles | 1,772 |  | 1,705 |
Total materials and supplies, net | 1,744 | [3] | 1,730 | [3]
Long-term mill and leach stockpiles | 2,472 |  | 2,386 |
Inventory obsolescence reserves | 21 |  | 24 |
Current [Member] |  |  |  |
Components of Inventories [Line Items] |  |  |  |
Mill stockpiles | 90 |  | 91 |
Leach stockpiles | 1,682 |  | 1,614 |
Mill and leach stockpiles | 1,772 |  | 1,705 |
Long-Term [Member] |  |  |  |
Components of Inventories [Line Items] |  |  |  |
Mill stockpiles | 730 |  | 698 |
Leach stockpiles | 1,742 |  | 1,688 |
Long-term mill and leach stockpiles | $ 2,472 | [4] | $ 2,386 | [4]
[1] | FCX's mining operations also have work-in-process inventories that are reflected as mill and leach stockpiles.
[2] | Primarily included molybdenum concentrates; copper concentrates, anodes, cathodes and rod; and various cobalt products.
[3] | Materials and supplies inventory was net of obsolescence reserves totaling $21 million at March 31, 2014, and $24 million at December 31, 2013.
[4] | Estimated metals in stockpiles not expected to be recovered within the next 12 months.

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