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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
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of Inventories [Line Items]            
Total materials and supplies, net $ 1,649     $ 1,649 $ 1,528  
Mill stockpiles 220     220 282  
Inventory, Ore Stockpiles on Leach Pads, Gross 923     923 915  
Leach stockpiles         256  
Total current mill and leach stockpiles 1,143     1,143 1,197  
Raw materials (primarily concentrate) 318     318 260  
Work-in-process 124     124 192  
Finished goods 839     839 1,326  
Total product 1,281     1,281 1,778  
Mill stockpiles 181     181 265  
Leach stockpiles 1,244     1,244 1,305  
Total long-term inventories 1,425     1,425 1,570  
Inventory obsolescence reserves 24     24 24  
Metals inventory adjustments $ 79 $ 41 $ 59 179 $ 4 $ 8
Molybdenum            
Components of Inventories [Line Items]            
Metals inventory adjustments       84    
Cobalt            
Components of Inventories [Line Items]            
Metals inventory adjustments       58    
Copper            
Components of Inventories [Line Items]            
Metals inventory adjustments       $ 37