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INCOME TAX EXPENSE - Schedule of Components of Income Tax Expense (Recovery) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Current tax    
Charge for the year $ 1,125 $ 911
Adjustment in respect of prior years 0 (2)
Canada 7 7
International 1,118 902
Current tax 1,125 909
Deferred tax    
Origination and reversal of temporary differences in the current year 112 10
Adjustment in respect of prior years (6) (2)
Canada (97) (30)
International 203 38
Deferred tax 106 8
Income tax expense $ 1,231 $ 917