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GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance $ 169 $ 226
Additions other than through business combinations, intangible assets other than goodwill   5
Disposals, intangible assets and goodwill (16) (46)
Amortization and impairment losses 3 16
Intangible assets, ending balance 150 169
Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance 369  
Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance (219)  
Water rights    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 67 72
Additions other than through business combinations, intangible assets other than goodwill   0
Disposals, intangible assets and goodwill (6) (5)
Amortization and impairment losses 0 0
Intangible assets, ending balance 61 67
Water rights | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance 61  
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 6 7
Additions other than through business combinations, intangible assets other than goodwill   0
Disposals, intangible assets and goodwill 0 0
Amortization and impairment losses 0 1
Intangible assets, ending balance 6 6
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 (11)  
Supply contracts    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 4 7
Additions other than through business combinations, intangible assets other than goodwill   0
Disposals, intangible assets and goodwill 0 0
Amortization and impairment losses 3 3
Intangible assets, ending balance 1 4
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 (38)  
Exploration potential    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 92 140
Additions other than through business combinations, intangible assets other than goodwill   5
Disposals, intangible assets and goodwill (10) (41)
Amortization and impairment losses 0 12
Intangible assets, ending balance 82 $ 92
Exploration potential | Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance 252  
Exploration potential | Accumulated amortization and impairment losses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, ending balance $ (170)