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INCOME TAXES - Reconciliation of income tax expense applying statutory tax and effective tax rates (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]    
Statutory income tax rate 26.70% 26.70%
Income before income tax expense $ 2,817 $ 2,530
Computed income tax expense 752 676
Non-deductible stock-based compensation 5 9
Non-deductible portion of equity losses 1 0
Non-deductible loss on FVTOCI investments 0 7
Income tax adjustment, legislative tax change 0 2
Non-taxable portion of capital gains (9) (10)
Other 9 1
Total income tax expense $ 758 $ 685
Effective income tax rate 26.90% 27.10%