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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Tables) | 3 Months Ended
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Mar. 31, 2016
Inventories, Including Long Term Mill and Leach Stockpiles [Abstract] |
Schedule of Inventory [Table Text Block] | The components of inventories follow (in millions):
| March 31, 2016 |  | December 31, 2015 |
Current inventories: |  |  |  |
Total materials and supplies, net a | $ | 1,714 |  |  | $ | 1,869 |  |
Mill stockpiles | $ | 139 |  |  | $ | 137 |  |
Leach stockpiles | 1,505 |  |  | 1,587 |  |
Total current mill and leach stockpiles | $ | 1,644 |  |  | $ | 1,724 |  |
Raw materials (primarily concentrate) | $ | 247 |  |  | $ | 220 |  |
Work-in-process | 118 |  |  | 108 |  |
Finished goods | 805 |  |  | 867 |  |
Total product inventories | $ | 1,170 |  |  | $ | 1,195 |  |
Long-term inventories: |  |  |  |
Mill stockpiles | $ | 521 |  |  | $ | 480 |  |
Leach stockpiles | 1,803 |  |  | 1,791 |  |
Total long-term mill and leach stockpiles b | $ | 2,324 |  |  | $ | 2,271 |  |
a. | Materials and supplies inventory was net of obsolescence reserves totaling $28 million at March 31, 2016, and $29 million at December 31, 2015.
b. | Estimated metals in stockpiles not expected to be recovered within the next 12 months.

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for sale or to be used in manufacturing, servicing or production process. + References No definition available. + Details
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