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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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