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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Components of Inventories [Line Items] |  |  |  |  |
Total materials and supplies, net | $ 1,619 |  | $ 1,619 |  | $ 1,528
Mill stockpiles, current | 200 |  | 200 |  | 282
Leach stockpiles, current | 1,102 |  | 1,102 |  | 1,171
Total current mill and leach stockpiles | 1,302 |  | 1,302 |  | 1,453
Raw materials (primarily concentrate) | 292 |  | 292 |  | 260
Work-in-process | 79 |  | 79 |  | 192
Finished goods | 1,142 |  | 1,142 |  | 1,326
Total product | 1,513 |  | 1,513 |  | 1,778
Mill stockpiles, noncurrent | 223 |  | 223 |  | 265
Leach stockpiles, noncurrent | 1,077 |  | 1,077 |  | 1,049
Total long-term mill and leach stockpiles | 1,300 |  | 1,300 |  | 1,314
Inventory obsolescence reserves | 26 |  | 26 |  | $ 24
Inventory Write-down | $ 41 | $ 0 | 100 | $ 2 |
Cobalt |  |  |  |  |
Components of Inventories [Line Items] |  |  |  |  |
Inventory Write-down |  |  | 58 |  |
Copper |  |  |  |  |
Components of Inventories [Line Items] |  |  |  |  |
Inventory Write-down |  |  | $ 41 |  |

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