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INCOME TAX EXPENSE - Schedule of Components of Income Tax Expense (Recovery) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Current tax |  |
Current tax expense (income) | $ 1,122 | $ 685
Adjustment in respect of prior years1 | 59 | 25
Canada | 14 | 5
International | 1,167 | 705
Current tax | 1,181 | 710
Deferred tax |  |
Origination and reversal of temporary differences in the current year | 263 | 1,112
Adjustment in respect of prior years1 | (112) | (39)
Canada | (6) | 0
International | 157 | 1,073
Deferred tax | 151 | 1,073
Income tax expense | $ 1,332 | $ 1,783

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