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INCOME TAX EXPENSE - Schedule of Components of Income Tax Expense (Recovery) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Current tax    
Charge for the year $ 685 $ 423
Adjustment in respect of prior years 25 45
Canada 5 0
International 705 468
Current tax 710 468
Deferred tax    
Origination and reversal of temporary differences in the current year 1,112 821
Adjustment in respect of prior years (39) (91)
Canada 0 628
International 1,073 102
Deferred tax 1,073 730
Income tax expense $ 1,783 $ 1,198