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INVENTORIES, INCLUDING LONG-TERM MILL AND LEACH STOCKPILES (Components of Inventories) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Components of Inventories [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total materials and supplies, net | $ 1,306 |  |  |  | $ 1,575 |  |  |  | $ 1,306 | $ 1,575 |
Mill stockpiles | 259 |  |  |  | 137 |  |  |  | 259 | 137 |
Leach stockpiles | 1,079 |  |  |  | 1,402 |  |  |  | 1,079 | 1,402 |
Total current mill and leach stockpiles | 1,338 |  |  |  | 1,539 |  |  |  | 1,338 | 1,539 |
Raw materials (primarily concentrate) | 255 |  |  |  | 220 |  |  |  | 255 | 220 |
Work-in-process | 114 |  |  |  | 108 |  |  |  | 114 | 108 |
Finished goods | 629 |  |  |  | 633 |  |  |  | 629 | 633 |
Total product inventories | 998 |  |  |  | 961 |  |  |  | 998 | 961 |
Mill stockpiles | 487 |  |  |  | 480 |  |  |  | 487 | 480 |
Leach stockpiles | 1,146 |  |  |  | 1,183 |  |  |  | 1,146 | 1,183 |
Total long-term inventoriesb | 1,633 |  |  |  | 1,663 |  |  |  | 1,633 | 1,663 |
Inventory obsolescence reserves | 29 |  |  |  | 26 |  |  |  | 29 | 26 |
Metals inventory adjustments | $ 9 | $ 20 | $ 2 | $ 5 | $ 184 | $ 91 | $ 59 | $ 4 | $ 36 | 338 | $ 6
Molybdenum |  |  |  |  |  |  |  |  |  |  |
Components of Inventories [Line Items] |  |  |  |  |  |  |  |  |  |  |
Metals inventory adjustments |  |  |  |  |  |  |  |  |  | 123 |
Copper |  |  |  |  |  |  |  |  |  |  |
Components of Inventories [Line Items] |  |  |  |  |  |  |  |  |  |  |
Metals inventory adjustments |  |  |  |  |  |  |  |  |  | $ 215 |

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