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INCOME TAX EXPENSE - Schedule of Components of Income Tax Expense (Recovery) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Current tax    
Charge for the year $ 423 $ 1,125
Adjustment in respect of prior years 45 0
Canada 0 7
International 468 1,118
Current tax 468 1,125
Deferred tax    
Origination and reversal of temporary differences in the current year 821 112
Adjustment in respect of prior years (91) (6)
Canada 628 (97)
International 102 203
Deferred tax 730 106
Income tax expense $ 1,198 $ 1,231