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v3.19.3.a.u2

INVENTORIES, INCLUDING LONG-TERM MILL AND LEACH STOCKPILES (Components of Inventories) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of Inventories [Line Items] |  |  |  |  |  |
Total materials and supplies, net | $ 1,649 |  |  | $ 1,649 | $ 1,528 |
Mill stockpiles | 220 |  |  | 220 | 282 |
Inventory, Ore Stockpiles on Leach Pads, Gross | 923 |  |  | 923 | 915 |
Leach stockpiles |  |  |  |  | 256 |
Total current mill and leach stockpiles | 1,143 |  |  | 1,143 | 1,197 |
Raw materials (primarily concentrate) | 318 |  |  | 318 | 260 |
Work-in-process | 124 |  |  | 124 | 192 |
Finished goods | 839 |  |  | 839 | 1,326 |
Total product | 1,281 |  |  | 1,281 | 1,778 |
Mill stockpiles | 181 |  |  | 181 | 265 |
Leach stockpiles | 1,244 |  |  | 1,244 | 1,305 |
Total long-term inventories | 1,425 |  |  | 1,425 | 1,570 |
Inventory obsolescence reserves | 24 |  |  | 24 | 24 |
Metals inventory adjustments | $ 79 | $ 41 | $ 59 | 179 | $ 4 | $ 8
Molybdenum |  |  |  |  |  |
Components of Inventories [Line Items] |  |  |  |  |  |
Metals inventory adjustments |  |  |  | 84 |  |
Cobalt |  |  |  |  |  |
Components of Inventories [Line Items] |  |  |  |  |  |
Metals inventory adjustments |  |  |  | 58 |  |
Copper |  |  |  |  |  |
Components of Inventories [Line Items] |  |  |  |  |  |
Metals inventory adjustments |  |  |  | $ 37 |  |

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