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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Components of Inventories [Line Items] |  |
Total materials and supplies, net | $ 1,276 | $ 1,306
Mill stockpiles | 336 | 259
Leach stockpiles | 1,057 | 1,079
Total current mill and leach stockpiles | 1,393 | 1,338
Raw materials (primarily concentrate) | 285 | 255
Work-in-process | 154 | 114
Finished goods | 749 | 629
Total product inventories | 1,188 | 998
Mill stockpiles | 346 | 487
Leach stockpiles | 1,107 | 1,146
Total long-term mill and leach stockpiles | 1,453 | 1,633
Inventory obsolescence reserves | $ 31 | $ 29

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