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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, 2020
Dec. 31, 2019
Income Taxes [Abstract]    
Statutory income tax rate 26.60% 26.70%
Income before income tax expense $ 2,172 $ 2,755
Computed income tax expense 578 736
Increase (decrease) in income tax expense resulting from:    
Non-deductible portion of equity losses 10 7
Income tax adjustment, legislative tax change (3) (23)
Non-taxable portion of capital gains 0 (2)
Other (5) (6)
Total income tax expense $ 580 $ 712
Effective income tax rate 26.70% 25.80%