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INTANGIBLE ASSETS - Net Amounts (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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Disclosure of detailed information about intangible assets [line items] |  |  |  |
Net intangible assets | $ 12,155 | $ 11,635 |  |
Cost |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Net intangible assets | 13,283 | 12,515 | $ 9,555 | $ 10,470
Accumulated amortization |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Net intangible assets | $ (1,128) | $ (880) | $ (687) | $ (576)

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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 2018-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_c&doctype=Standard -URIDate 2018-03-16 + Details
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