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INVENTORIES, INCLUDING LONG-TERM MILL AND LEACH STOCKPILES (Tables)
 12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories follow:
 December 31,
 20202019
Current inventories:
Total materials and supplies, neta
$1,594 $1,649 
Mill stockpiles$205 $220 
Leach stockpiles809 923 
Total current mill and leach stockpiles$1,014 $1,143 
Raw materials (primarily concentrate)$366 $318 
Work-in-process174 124 
Finished goods745 839 
Total product$1,285 $1,281 
Long-term inventories:
Mill stockpiles$223 $181 
Leach stockpiles1,240 1,244 
Total long-term mill and leach stockpilesb
$1,463 $1,425 
a.Materials and supplies inventory was net of obsolescence reserves totaling $32 million at December 31, 2020, and $24 million at December 31, 2019.
b.Estimated metals in stockpiles not expected to be recovered within the next 12 months.