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GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, beginning balance | $ 226 | $ 227
Additions other than through business combinations, intangible assets other than goodwill | 5 | 1
Disposals, intangible assets and goodwill | 46 |
Amortization and impairment losses | (16) | (2)
Intangible assets, ending balance | 169 | 226
Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, ending balance | 385 |
Accumulated amortization and impairment losses |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, ending balance | (216) |
Water rights |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, beginning balance | 72 | 71
Additions other than through business combinations, intangible assets other than goodwill | 0 | 1
Disposals, intangible assets and goodwill | 5 |
Amortization and impairment losses | 0 | 0
Intangible assets, ending balance | 67 | 72
Water rights | Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, ending balance | 67 |
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 | 7 | 8
Additions other than through business combinations, intangible assets other than goodwill | 0 | 0
Disposals, intangible assets and goodwill | 0 |
Amortization and impairment losses | (1) | (1)
Intangible assets, ending balance | 6 | 7
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 | 7 | 8
Additions other than through business combinations, intangible assets other than goodwill | 0 | 0
Disposals, intangible assets and goodwill | 0 |
Amortization and impairment losses | (3) | (1)
Intangible assets, ending balance | 4 | 7
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 | (35) |
Exploration potential |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, beginning balance | 140 | 140
Additions other than through business combinations, intangible assets other than goodwill | 5 | 0
Disposals, intangible assets and goodwill | 41 |
Amortization and impairment losses | (12) | 0
Intangible assets, ending balance | 92 | $ 140
Exploration potential | Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, ending balance | 262 |
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 2019-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2019-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 118 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_e_ii&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_c&doctype=Standard -URIDate 2019-03-27 + Details
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