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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