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Inventories, Including Long-Term Mill and Leach Stockpiles - Schedule of Inventory (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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Current inventories: |  |
Total materials and supplies, net | $ 1,873 | $ 1,669
Mill stockpiles | 202 | 193
Leach stockpiles | 1,167 | 977
Total current mill and leach stockpiles | 1,369 | 1,170
Raw materials (primarily concentrate) | 353 | 536
Work-in-process | 204 | 195
Finished goods | 1,020 | 927
Total product | 1,577 | 1,658
Long-term inventories: |  |
Mill stockpiles | 203 | 226
Leach stockpiles | 991 | 1,161
Total long-term mill and leach stockpiles | 1,194 | 1,387
Inventory obsolescence reserves | $ 41 | $ 36

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