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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Tables) | 6 Months Ended
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Jun. 30, 2017
Inventory Disclosure [Abstract] |
Schedule of Inventory [Table Text Block] | The components of inventories follow (in millions):
| June 30, 2017 |  | December 31, 2016 |
Current inventories: |  |  |  |
Total materials and supplies, net a | $ | 1,264 |  |  | $ | 1,306 |  |
Mill stockpiles | $ | 313 |  |  | $ | 259 |  |
Leach stockpiles | 1,046 |  |  | 1,079 |  |
Total current mill and leach stockpiles | $ | 1,359 |  |  | $ | 1,338 |  |
Raw materials (primarily concentrate) | $ | 295 |  |  | $ | 255 |  |
Work-in-process | 121 |  |  | 114 |  |
Finished goods | 603 |  |  | 629 |  |
Total product inventories | $ | 1,019 |  |  | $ | 998 |  |
Long-term inventories: |  |  |  |
Mill stockpiles | $ | 425 |  |  | $ | 487 |  |
Leach stockpiles | 1,129 |  |  | 1,146 |  |
Total long-term mill and leach stockpiles b | $ | 1,554 |  |  | $ | 1,633 |  |
a. | Materials and supplies inventory was net of obsolescence reserves totaling $30 million at June 30, 2017, and $29 million at December 31, 2016.
b. | Estimated metals in stockpiles not expected to be recovered within the next 12 months.

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