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INVENTORIES, INCLUDING LONG-TERM MILL AND LEACH STOCKPILES (Tables)
 12 Months Ended
Dec. 31, 2015
Inventories, Including Long Term Mill and Leach Stockpiles [Abstract]  
Components of Inventories
The components of inventories follow:
 
December 31,
 
 
2015
 
2014
 
Current inventories:
 
 
 
 
Total materials and supplies, neta
$
1,594

 
$
1,612

 
 
 
 
 
 
Mill stockpiles
$
137

 
$
86

 
Leach stockpiles
1,402

 
1,676

 
Total current mill and leach stockpiles
$
1,539

 
$
1,762

 
 
 
 
 
 
Raw materials (primarily concentrate)
$
220

 
$
288

 
Work-in-process
108

 
174

 
Finished goods
743

 
931

 
Total product inventories
$
1,071

 
$
1,393

 
 
 
 
 
 
Long-term inventories:
 
 
 
 
Mill stockpiles
$
480

 
$
360

 
Leach stockpiles
1,183

 
1,328

 
Total long-term inventoriesb
$
1,663

 
$
1,688

 

a.
Materials and supplies inventory was net of obsolescence reserves totaling $26 million at December 31, 2015, and $19 million at December 31, 2014.
b.
Estimated metals in stockpiles not expected to be recovered within the next 12 months.