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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2022
Dec. 31, 2021
Deferred tax assets and liabilities [abstract]          
Deferred tax assets $ 6,708 $ 6,739 $ 6,708 $ 7,767  
Deferred tax liability $ (1,536) (1,697) (1,536) $ (1,713)  
Net deferred tax assets (liabilities)   $ 5,042 $ 5,172   $ 6,054