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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 $ 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