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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Components of Inventories [Line Items]      
Total materials and supplies, net $ 1,595   $ 1,528
Mill stockpiles, current 247   282
Leach stockpiles, current 1,127   1,171
Total current mill and leach stockpiles 1,374   1,453
Raw materials (primarily concentrate) 273   260
Work-in-process 137   192
Finished goods 1,082   1,326
Total product 1,492   1,778
Mill stockpiles, noncurrent 265   265
Leach stockpiles, noncurrent 1,078   1,049
Total long-term mill and leach stockpiles 1,343   1,314
Inventory obsolescence reserves 23   $ 24
Inventory Write-down $ 57 $ 0