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INCOME TAXES - Components of tax expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]    
Total current tax expense $ 483 $ 351
Origination of temporary differences 275 332
Revaluation of deferred tax balances due to legislative changes 0 2
Total deferred tax expense 275 334
Total income tax expense $ 758 $ 685