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INVENTORIES, INCLUDING LONG-TERM MILL AND LEACH STOCKPILES (Components of Inventories) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components of Inventories [Line Items] |  |  |
Total materials and supplies, net | $ 1,305 | $ 1,306 |
Mill stockpiles | 360 | 259 |
Leach stockpiles | 1,062 | 1,079 |
Total current mill and leach stockpiles | 1,422 | 1,338 |
Raw materials (primarily concentrate) | 265 | 255 |
Work-in-process | 154 | 114 |
Finished goods | 747 | 629 |
Total product inventories | 1,166 | 998 |
Mill stockpiles | 300 | 487 |
Leach stockpiles | 1,109 | 1,146 |
Total long-term inventoriesb | 1,409 | 1,633 |
Inventory obsolescence reserves | 29 | 29 |
Metals inventory adjustments | $ 8 | $ 36 | $ 338
Molybdenum |  |  |
Components of Inventories [Line Items] |  |  |
Metals inventory adjustments |  |  | 123
Copper |  |  |
Components of Inventories [Line Items] |  |  |
Metals inventory adjustments |  |  | $ 215

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