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Inventories, Including Long-Term Mill and Leach Stockpiles - Schedule of Inventory (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Current inventories: |  |
Total materials and supplies, net | $ 1,617 | $ 1,594
Mill stockpiles | 209 | 205
Leach stockpiles | 877 | 809
Total current mill and leach stockpiles | 1,086 | 1,014
Raw materials (primarily concentrate) | 437 | 366
Work-in-process | 184 | 174
Finished goods | 796 | 745
Total product | 1,417 | 1,285
Long-term inventories: |  |
Mill stockpiles | 223 | 223
Leach stockpiles | 1,227 | 1,240
Total long-term mill and leach stockpiles | 1,450 | 1,463
Inventory obsolescence reserves | $ 37 | $ 32

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