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INTANGIBLE ASSETS - Net Amounts (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Disclosure of detailed information about intangible assets [line items] |  |  |  |
Net intangible assets | $ 8,868 | $ 9,894 |  |
Cost |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Net intangible assets | 9,555 | 10,470 | $ 10,292 | $ 4,732
Accumulated amortization |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Net intangible assets | $ (687) | $ (576) | $ (418) | $ (267)

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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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