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Operating and Geographic Segmentation - Summary of Average Assets, Grouped by Geographic Region (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of geographical areas [line items]    
Total Revenue $ 36,274 $ 32,795
Income before taxes 11,550 9,535
Reported net income 8,725 7,327
Average Assets 1,480,561 1,369,415
Canada [member]    
Disclosure of geographical areas [line items]    
Total Revenue 18,885 16,107
Income before taxes 5,741 4,434
Reported net income 4,191 3,199
Average Assets 732,391 692,750
United States [member]    
Disclosure of geographical areas [line items]    
Total Revenue 15,194 14,465
Income before taxes 4,339 3,547
Reported net income 3,408 2,865
Average Assets 675,161 613,098
Other international non CAN non US [member]    
Disclosure of geographical areas [line items]    
Total Revenue 2,195 2,223
Income before taxes 1,470 1,554
Reported net income 1,126 1,263
Average Assets $ 73,009 $ 63,567