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INCOME TAXES - Income Tax Recognized in Profit or Loss (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Abstract] |  |  |
Current income tax expense | $ 237 | $ 250 | $ 318
Origination and reversal of temporary differences | (37) | 29 | 53
Changes in tax rates or the imposition of new taxes | 41 | (20) | (11)
Previously unrecognized deferred taxes | 50 | 19 | 4
Net income before income tax | 1,195 | 928 | 1,170
Income tax expense calculated at the domestic rates applicable to profits in the country concerned | 431 | 304 | 275
Change in substantively enacted tax rates | 41 | (20) | (11)
International operations subject to different tax rates | (21) | (6) | (17)
Taxable income attributable to non-controlling interests | (91) | (62) | (35)
Portion of gains subject to different tax rates | (117) | 34 | 141
Deferred tax assets not recognized | 50 | 19 | 4
Permanent differences and other | (2) | 9 | 7
Total income tax expense | $ 291 | $ 278 | $ 364

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- Definition The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2020-01-01 + Details
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