v3.26.1
Acquisitions and Divestitures - Additional Information (Detail)
$ in Millions
 2 Months Ended 3 Months Ended 9 Months Ended
Dec. 01, 2025
Oct. 31, 2025
CAD ($)
Jan. 31, 2026
CAD ($)
Jul. 31, 2026
CAD ($)
Apr. 30, 2026
CAD ($)
Jul. 31, 2025
CAD ($)
Jul. 31, 2026
CAD ($)
Jul. 31, 2025
CAD ($)
Jun. 12, 2026
CAD ($)
Disclosure of detailed information about business combination [line items]                  
Non-interest income       $ 4,669 $ 4,316 $ 3,993 $ 13,049 $ 12,002  
Non interest expense       5,556 5,189 $ 5,089 16,044 $ 16,690  
Total liabilities   $ 1,371,455   1,457,645 1,432,939   1,457,645    
Total assets   1,460,042   1,548,267 $ 1,521,521   1,548,267    
Colombia, Costa Rica and Panama [Member]                  
Disclosure of detailed information about business combination [line items]                  
Non-interest income       423          
Non interest expense       11          
Total impairment loss after tax   $ 1,342              
Common equity tier 1 capital ratio impact   0.15%              
Investment in associate fair value   $ 1,370              
Proportion of ownership interest in common share 14.99%                
Non interest income after tax     $ 377            
Proportion of ownership interest in associate 20.30%                
Colombia, Costa Rica and Panama [Member] | Assets and liabilities classified as held for sale [member]                  
Disclosure of detailed information about business combination [line items]                  
Total liabilities       22,000     22,000    
Total assets       $ 24,000     $ 24,000    
Scotia group jamaica limited [member]                  
Disclosure of detailed information about business combination [line items]                  
Business acquisition, purchase price, cash                 $ 500
Percentage in the tier one ratio                 0.0006