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INVENTORIES, INCLUDING LONG-TERM MILL AND LEACH STOCKPILES (Components of Inventories) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of Inventories [Line Items]        
Total materials and supplies, net   $ 1,528 $ 1,323  
Mill stockpiles   282 360  
Leach stockpiles   1,171 1,062  
Total current mill and leach stockpiles   1,453 1,422  
Raw materials (primarily concentrate)   260 265  
Work-in-process   192 154  
Finished goods   1,326 985  
Total product inventories   1,778 1,404  
Mill stockpiles   265 300  
Leach stockpiles   1,049 1,109  
Total long-term inventories   1,314 1,409  
Inventory obsolescence reserves   24 29 $ 29
Metals inventory adjustments $ 12 $ 4 $ 8 $ 36