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GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance $ 150 $ 169
Disposals   (16)
Amortisation and impairment loss, intangible assets other than goodwill (1) (3)
Intangible assets, ending balance 149 150
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 (220)  
Water rights    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 61 67
Disposals   (6)
Amortisation and impairment loss, intangible assets other than goodwill 0 0
Intangible assets, ending balance 61 61
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 6
Disposals   0
Amortisation and impairment loss, intangible assets other than goodwill 0 0
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 1 4
Disposals   0
Amortisation and impairment loss, intangible assets other than goodwill (1) (3)
Intangible assets, ending balance 0 1
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 (39)  
Exploration potential    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets, beginning balance 82 92
Disposals   (10)
Amortisation and impairment loss, intangible assets other than goodwill 0 0
Intangible assets, ending balance 82 $ 82
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)