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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets and liabilities [abstract]      
Deferred tax assets $ 5,423 $ 5,254  
Deferred tax liability (2,774) (2,769)  
Net deferred tax assets (liabilities) $ 2,649 $ 2,485 $ 2,228