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INCOME TAXES - Income Tax Recognized in Profit or Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]      
Current income tax expense $ 167 $ 175 $ 134
Origination and reversal of temporary differences 67 89 94
Change in tax rates or the imposition of new taxes 27 0 0
Deferred tax assets not recognized 8 8 6
Total income tax expense 269 272 234
Net income before income tax and non-controlling interests 37 842 815
Income tax expense calculated at the domestic rates applicable to profits in the country concerned 70 267 257
Change in tax rates and new legislation 27 0 0
International operations subject to different tax rates (3) (3) (12)
Taxable income attributable to non-controlling interests (5) (6) (24)
Portion of gains subject to different tax rates 0 8 9
Deferred tax assets not recognized 8 8 6
Foreign exchange 17 0 0
Non-deductible dividends on exchangeable shares 18 0 0
Non-deductible remeasurement adjustments on exchangeable and class B shares 136 0 0
Permanent differences and other 1 (2) (2)
Income tax expense recognized in profit or loss $ 269 $ 272 $ 234