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INCOME TAXES - Income Tax Recognized Directly in Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total income tax expense recognized directly in other comprehensive income | $ (125) | $ (142) | $ (97)
Revaluation of property, plant and equipment |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total income tax expense recognized directly in other comprehensive income | (219) | (148) | (95)
Cash flow hedges |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total income tax expense recognized directly in other comprehensive income | 63 | 3 | 3
Pension plan actuarial changes |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Total income tax expense recognized directly in other comprehensive income | $ 31 | $ 3 | $ (5)

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- Definition The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_90&doctype=Standard -URIDate 2020-01-01 + Details
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