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

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