Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Components of Inventories [Line Items]
Total materials and supplies, net	$ 1,614		$ 1,649
Mill stockpiles, current	158		220
Leach stockpiles, current	948		923
Total current mill and leach stockpiles	1,106		1,143
Raw materials (primarily concentrate)	209		318
Work-in-process	106		124
Finished goods	819		839
Total product	1,134		1,281
Mill stockpiles, noncurrent	193		181
Leach stockpiles, noncurrent	1,079		1,244
Total long-term mill and leach stockpiles	1,272		1,425
Inventory obsolescence reserves	25		$ 24
Inventory Write-down	222	$ 57
Copper
Components of Inventories [Line Items]
Inventory Write-down	205
Molybdenum
Components of Inventories [Line Items]
Inventory Write-down	$ 17