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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

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