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INVENTORIES, INCLUDING LONG-TERM MILL AND LEACH STOCKPILES (Tables)
 12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories follow:
 December 31,
 20212020
Current inventories:
Total materials and supplies, neta
$1,669 $1,594 
Mill stockpiles$193 $205 
Leach stockpiles977 809 
Total current mill and leach stockpiles$1,170 $1,014 
Raw materials (primarily concentrate)$536 $366 
Work-in-process195 174 
Finished goods927 745 
Total product$1,658 $1,285 
Long-term inventories:
Mill stockpiles$226 $223 
Leach stockpiles1,161 1,240 
Total long-term mill and leach stockpilesb
$1,387 $1,463 
a.Materials and supplies inventory was net of obsolescence reserves totaling $36 million at December 31, 2021, and $32 million at December 31, 2020.
b.Estimated metals in stockpiles not expected to be recovered within the next 12 months.