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INCOME TAXES - Components of tax expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]    
Total current tax expense $ 269 $ 483
Origination of temporary differences 466 275
Revaluation of deferred tax balances due to legislative changes (23) 0
Total deferred tax expense 443 275
Total income tax expense $ 712 $ 758