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GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, beginning balance | $ 272 | $ 271
Additions | 16 | 4
Disposals | (16) |
Amortization and impairment losses | (17) | (3)
Intangible assets, ending balance | 255 | 272
Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, ending balance | 425 |
Accumulated amortization and impairment losses |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, ending balance | 170 |
Water rights |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, beginning balance | 87 | 87
Additions | 0 | 0
Disposals | (16) |
Amortization and impairment losses | 0 | 0
Intangible assets, ending balance | 71 | 87
Water rights | Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, ending balance | 71 |
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 | 11 | 12
Additions | 0 | 0
Disposals | 0 |
Amortization and impairment losses | (2) | (1)
Intangible assets, ending balance | 9 | 11
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 | 8 |
Supply contracts |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, beginning balance | 14 | 16
Additions | 0 | 0
Disposals | 0 |
Amortization and impairment losses | (3) | (2)
Intangible assets, ending balance | 11 | 14
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 | 28 |
Exploration potential |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, beginning balance | 160 | 156
Additions | 16 | 4
Disposals | 0 |
Amortization and impairment losses | (12) | 0
Intangible assets, ending balance | 164 | $ 160
Exploration potential | Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, ending balance | 298 |
Exploration potential | Accumulated amortization and impairment losses |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Intangible assets, ending balance | $ 134 |

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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 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_vi&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease in intangible assets other than goodwill resulting from disposals. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_ii&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_c&doctype=Standard -URIDate 2017-03-09 + Details
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