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OTHER EXPENSE (INCOME) OTHER EXPENSE (INCOME) - Impairment reversal (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9 | $ 12 | $ 59 | $ 15 | $ 61
Non-current assets or disposal groups classified as held for sale [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9 | 12 | 35 | 15 | 37
Intangible assets other than goodwill [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9 | $ 0 | $ 24 | $ 0 | $ 24

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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 amount of impairment loss, impairment gain or reversal of impairment loss that is recognised in profit or loss in accordance with paragraph 5.5.8 of IFRS 9 and that arises from applying the impairment requirements in Section 5.5 of IFRS 9. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 82 -Subparagraph ba -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_82_ba&doctype=Standard -URIDate 2018-03-16 + Details
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