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INTANGIBLE ASSETS - Net Amounts (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about intangible assets [line items] |  |  |
Net intangible assets | $ 11,767 | $ 14,386 |
Cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Net intangible assets | 13,233 | 15,695 | $ 12,515
Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Net intangible assets | $ (1,466) | $ (1,309) | $ (880)

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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 2020-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_c&doctype=Standard -URIDate 2020-01-01 + Details
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