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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Components of Inventories [Line Items] |  |  |  |  |
Total materials and supplies, net | $ 1,604 |  | $ 1,604 |  | $ 1,649
Mill stockpiles, current | 166 |  | 166 |  | 220
Leach stockpiles, current | 864 |  | 864 |  | 923
Total current mill and leach stockpiles | 1,030 |  | 1,030 |  | 1,143
Raw materials (primarily concentrate) | 287 |  | 287 |  | 318
Work-in-process | 110 |  | 110 |  | 124
Finished goods | 779 |  | 779 |  | 839
Total product | 1,176 |  | 1,176 |  | 1,281
Mill stockpiles, noncurrent | 207 |  | 207 |  | 181
Leach stockpiles, noncurrent | 1,239 |  | 1,239 |  | 1,244
Total long-term mill and leach stockpiles | 1,446 |  | 1,446 |  | 1,425
Inventory obsolescence reserves | 31 |  | 31 |  | $ 24
Metals inventory adjustments | (139) | $ 2 | 83 | $ 59 |
Inventory Write-down |  | $ 2 |  | $ 59 |
Metals |  |  |  |  |
Components of Inventories [Line Items] |  |  |  |  |
Metals inventory adjustments | 139 |  |  |  |
Inventory Write-down |  |  | 83 |  |
Copper |  |  |  |  |
Components of Inventories [Line Items] |  |  |  |  |
Metals inventory adjustments | 144 |  |  |  |
Inventory Write-down |  |  | 61 |  |
Molybdenum |  |  |  |  |
Components of Inventories [Line Items] |  |  |  |  |
Inventory Write-down | $ 5 |  | $ 22 |  |

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