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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Components of Inventories [Line Items] |  |
Total materials and supplies, net | $ 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
Mill stockpiles | 425 | 487
Leach stockpiles | 1,129 | 1,146
Total long-term mill and leach stockpiles | 1,554 | 1,633
Inventory obsolescence reserves | $ 30 | $ 29

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