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Investments in Associates - Summary of Significant Investments in Associates (Parenthetical) (Detail) - CAD ($)
$ in Millions
3 Months Ended
Dec. 01, 2025
Jan. 31, 2026
Oct. 31, 2025
Jan. 31, 2025
Disclosure of associates [line items]        
Undistributed retained earnings   $ 76 $ 76 $ 77
Investments in associates based on quoted stock exchange price   591 617  
Davivienda Group S.A. [member]        
Disclosure of associates [line items]        
Investment property recognised at fair value   1,370    
Proportion of voting rights held in associate 14.99%      
Proportion of ownership interest in associate 20.30%      
KeyCorp [member]        
Disclosure of associates [line items]        
Investments in associates based on quoted stock exchange price   4,742 $ 4,018  
Dividends received   $ 47