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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, 2022
Dec. 31, 2021
Income Taxes [Abstract]    
Statutory income tax rate 26.50% 26.50%
Income before income tax expense $ 2,289 $ 2,127
Computed income tax expense 607 564
Increase (decrease) in income tax expense resulting from:    
Non-deductible stock-based compensation 10 1
Non-deductible portion of equity losses 9 12
Non-taxable portion of capital gains (5) 0
Non-taxable income from security investments (12) (11)
Other 0 3
Total income tax expense $ 609 $ 569
Effective income tax rate 26.60% 26.80%