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Segmented Information (Summary of Results by Geographic Location) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of geographical areas [line items]    
Total revenue $ 67,777 $ 57,223
Total assets 2,094,558 2,061,751
Canada [member]    
Disclosure of geographical areas [line items]    
Total revenue 33,916 31,453
Total assets 1,167,980 1,146,243
United States [member]    
Disclosure of geographical areas [line items]    
Total revenue 29,706 22,097
Total assets 753,258 749,353
Other International [Member]    
Disclosure of geographical areas [line items]    
Total revenue 4,155 3,673
Total assets $ 173,320 $ 166,155