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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Components of Inventories [Line Items]      
Total materials and supplies, net $ 1,596   $ 1,594
Mill stockpiles, current 177   205
Leach stockpiles, current 830   809
Total current mill and leach stockpiles 1,007   1,014
Raw materials (primarily concentrate) 419   366
Work-in-process 165   174
Finished goods 958   745
Total product 1,542   1,285
Mill stockpiles, noncurrent 245   223
Leach stockpiles, noncurrent 1,230   1,240
Total long-term mill and leach stockpiles 1,475   1,463
Inventory obsolescence reserves 35   $ 32
Metals inventory adjustments 1 $ 222  
Metals      
Components of Inventories [Line Items]      
Inventory Write-down $ 1 222  
Copper      
Components of Inventories [Line Items]      
Inventory Write-down   205  
Molybdenum      
Components of Inventories [Line Items]      
Inventory Write-down   $ 17