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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Tables) | 9 Months Ended
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Sep. 30, 2015
Inventories, Including Long Term Mill and Leach Stockpiles [Abstract] |
Components of inventories | The components of inventories follow (in millions):
| September 30, 2015 |  | December 31, 2014 |
Current inventories: |  |  |  |
Total materials and supplies, net a | $ | 2,071 |  |  | $ | 1,886 |  |
Mill stockpiles | $ | 118 |  |  | $ | 86 |  |
Leach stockpiles | 1,777 |  |  | 1,828 |  |
Total current mill and leach stockpiles | $ | 1,895 |  |  | $ | 1,914 |  |
Raw materials (primarily concentrates) | $ | 281 |  |  | $ | 288 |  |
Work-in-process | 102 |  |  | 174 |  |
Finished goods | 996 |  |  | 1,099 |  |
Total product inventories | $ | 1,379 |  |  | $ | 1,561 |  |
Long-term inventories: |  |  |  |
Mill stockpiles | $ | 444 |  |  | $ | 360 |  |
Leach stockpiles | 1,882 |  |  | 1,819 |  |
Total long-term mill and leach stockpiles b | $ | 2,326 |  |  | $ | 2,179 |  |
a. | Materials and supplies inventory was net of obsolescence reserves totaling $26 million at September 30, 2015, and $20 million at December 31, 2014.
b. | Estimated metals in stockpiles not expected to be recovered within the next 12 months.

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