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Operating and Geographic Segmentation - Summary of Average Assets, Grouped by Operating Segment (Parenthetical) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of operating segments [line items]    
Average Earning Assets $ 1,305,072 $ 1,235,830
Canadian Personal and Commercial Banking [member]    
Disclosure of operating segments [line items]    
Average Earning Assets 342,361 319,518
U.S. Banking [member]    
Disclosure of operating segments [line items]    
Average Earning Assets 235,855 230,500
All Other Operating Segments [member]    
Disclosure of operating segments [line items]    
Average Earning Assets $ 726,856 $ 685,812