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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items] |  |
Capital commitments | $ 1,382 | $ 1,119
Operating lease commitments | 68 |
Less than 1 year |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Operating lease commitments | 21 |
Payable within two to five years |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Operating lease commitments | 46 |
Over 5 years |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Operating lease commitments | 2 |
MIning property costs subject to depreciation | Revision of LOM Plan |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Accumulated expense decrease | 91 | 67
Construction activities |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Capital commitments | $ 118 | $ 103

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- Definition The amount of future capital expenditures that the entity is committed to make. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The increase (decrease) in an accounting estimate that has an effect in the current period or is expected to have an effect in future periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 8 -IssueDate 2017-01-01 -Paragraph 39 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=8&date=2017-03-01&anchor=para_39&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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