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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) |

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- Definition The decrease in intangible assets and goodwill resulting from disposals. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2022-03-24 -Paragraph 118 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2022-en-r&anchor=para_118_e_ii&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2022-03-24 -Paragraph 118 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2022-en-r&anchor=para_118_e&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_c&doctype=Standard -URIDate 2022-03-24 + Details
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