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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Components of Inventories [Line Items] |  |  |
Total materials and supplies, net | $ 1,614 |  | $ 1,649
Mill stockpiles, current | 158 |  | 220
Leach stockpiles, current | 948 |  | 923
Total current mill and leach stockpiles | 1,106 |  | 1,143
Raw materials (primarily concentrate) | 209 |  | 318
Work-in-process | 106 |  | 124
Finished goods | 819 |  | 839
Total product | 1,134 |  | 1,281
Mill stockpiles, noncurrent | 193 |  | 181
Leach stockpiles, noncurrent | 1,079 |  | 1,244
Total long-term mill and leach stockpiles | 1,272 |  | 1,425
Inventory obsolescence reserves | 25 |  | $ 24
Inventory Write-down | 222 | $ 57 |
Copper |  |  |
Components of Inventories [Line Items] |  |  |
Inventory Write-down | 205 |  |
Molybdenum |  |  |
Components of Inventories [Line Items] |  |  |
Inventory Write-down | $ 17 |  |

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