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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components of Inventories [Line Items]              
Total material and supplies, net [1] $ 1,594       $ 1,594 $ 1,612  
Total current mill and leach stockpiles 1,539       1,539 1,762  
Raw materials (primarily concentrate) 220       220 288  
Work-in-process 108       108 174  
Finished goods 743       743 931  
Total product inventories 1,071       1,071 1,393  
Total long-term inventories 1,663       1,663 1,688  
Inventory obsolescence reserves 26       26 19  
Copper and Molybdenum Inventory Adjustments 184 $ 91 $ 59 $ 4 338 6 $ 3
Current [Member]              
Components of Inventories [Line Items]              
Mill Stockpiles 137       137 86  
Leach stockpiles 1,402       1,402 1,676  
Total current mill and leach stockpiles 1,539       1,539 1,762  
Long-Term [Member]              
Components of Inventories [Line Items]              
Mill Stockpiles 480       480 360  
Leach stockpiles 1,183       1,183 1,328  
Total long-term inventories [2] $ 1,663       1,663 $ 1,688  
Copper [Member]              
Components of Inventories [Line Items]              
Copper and Molybdenum Inventory Adjustments         215    
Molybdenum [Member]              
Components of Inventories [Line Items]              
Copper and Molybdenum Inventory Adjustments         $ 123    
[1] Materials and supplies inventory was net of obsolescence reserves totaling $26 million at December 31, 2015, and $19 million at December 31, 2014.
[2] Estimated metals in stockpiles not expected to be recovered within the next 12 months.