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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, 2019
Dec. 31, 2018
Income Taxes [Abstract]    
Statutory income tax rate 26.70% 26.70%
Income before income tax expense $ 2,755 $ 2,817
Computed income tax expense 736 752
Increase (decrease) in income tax expense resulting from:    
Non-deductible stock-based compensation 0 5
Non-deductible portion of equity losses 7 1
Income tax adjustment, legislative tax change (23) 0
Non-taxable portion of capital gains (2) (9)
Other (6) 9
Total income tax expense $ 712 $ 758
Effective income tax rate 25.80% 26.90%