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GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]    
Impairment loss recognised in profit or loss, goodwill $ 154  
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 255 $ 272
Additions other than through business combinations, intangible assets other than goodwill   16
Disposals   16
Amortization and impairment losses5 (28) (17)
Intangible assets, ending balance 227 255
Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance 425  
Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance 198  
Water rights    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 71 87
Additions other than through business combinations, intangible assets other than goodwill   0
Disposals   16
Amortization and impairment losses5 0 0
Intangible assets, ending balance 71 71
Water rights | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance 71  
Water rights | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance 0  
Technology    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 9 11
Additions other than through business combinations, intangible assets other than goodwill   0
Disposals   0
Amortization and impairment losses5 (1) (2)
Intangible assets, ending balance 8 9
Technology | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance 17  
Technology | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance 9  
Supply contracts    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 11 14
Additions other than through business combinations, intangible assets other than goodwill   0
Disposals   0
Amortization and impairment losses5 (3) (3)
Intangible assets, ending balance 8 11
Supply contracts | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance 39  
Supply contracts | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance 31  
Exploration potential    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 164 160
Additions other than through business combinations, intangible assets other than goodwill   16
Disposals   0
Amortization and impairment losses5 (24) (12)
Intangible assets, ending balance 140 $ 164
Exploration potential | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance 298  
Exploration potential | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance $ 158