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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Tables) | 3 Months Ended
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Mar. 31, 2019
Inventory Disclosure [Abstract] |
Schedule of Inventory | The components of inventories follow (in millions):
| March 31, 2019 |  | December 31, 2018 |
Current inventories: |  |  |  |
Total materials and supplies, net a | $ | 1,595 |  |  | $ | 1,528 |  |
Mill stockpiles | $ | 247 |  |  | $ | 282 |  |
Leach stockpiles | 1,127 |  |  | 1,171 |  |
Total current mill and leach stockpiles | $ | 1,374 |  |  | $ | 1,453 |  |
Raw materials (primarily concentrate) | $ | 273 |  |  | $ | 260 |  |
Work-in-process | 137 |  |  | 192 |  |
Finished goods | 1,082 |  |  | 1,326 |  |
Total product | $ | 1,492 |  |  | $ | 1,778 |  |
Long-term inventories: |  |  |  |
Mill stockpiles | $ | 265 |  |  | $ | 265 |  |
Leach stockpiles | 1,078 |  |  | 1,049 |  |
Total long-term mill and leach stockpiles b | $ | 1,343 |  |  | $ | 1,314 |  |
a. | Materials and supplies inventory was net of obsolescence reserves totaling $23 million at March 31, 2019, and $24 million at December 31, 2018.
b. Estimated metals in stockpiles not expected to be recovered within the next 12 months.

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