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INCOME TAXES - Components of tax expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Taxes [Abstract]    
Total current tax expense $ 325 $ 458
Deferred tax expense:    
Origination of temporary differences 284 111
Total income tax expense $ 609 $ 569