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Inventories, Including Long-Term Mill and Leach Stockpiles - Additional Information (Details)
$ / shares in Units, pounds in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Jul. 01, 2021
pounds
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Inventory [Line Items]          
Metals inventory adjustments   $ 14 $ 9 $ 15 $ 92
Increase in recoverable copper in leach stockpiles | pounds 191        
Increase in net income as a result of increased recoverable inventory   $ 52   $ 52  
Increase in earnings per share as a result of increased recoverable inventory | $ / shares   $ 0.04   $ 0.04  
Molybdenum          
Inventory [Line Items]          
Metals inventory adjustments         34
Copper          
Inventory [Line Items]          
Metals inventory adjustments         $ 58