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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) |

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2021-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2021-03-24 + Details
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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 2021-01-01 -Paragraph 118 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_ii&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_c&doctype=Standard -URIDate 2021-03-24 + Details
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