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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Components of Inventories [Line Items] |  |  |
Total materials and supplies, net | $ 1,595 |  | $ 1,528
Mill stockpiles, current | 247 |  | 282
Leach stockpiles, current | 1,127 |  | 1,171
Total current mill and leach stockpiles | 1,374 |  | 1,453
Raw materials (primarily concentrate) | 273 |  | 260
Work-in-process | 137 |  | 192
Finished goods | 1,082 |  | 1,326
Total product | 1,492 |  | 1,778
Mill stockpiles, noncurrent | 265 |  | 265
Leach stockpiles, noncurrent | 1,078 |  | 1,049
Total long-term mill and leach stockpiles | 1,343 |  | 1,314
Inventory obsolescence reserves | 23 |  | $ 24
Inventory Write-down | $ 57 | $ 0 |

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