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Loans and Allowance for Credit Losses - Schedule of impaired loans, including the related allowances (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Financial assets impaired [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans $ 6,117 $ 5,190
Financial assets impaired [member] | Canada [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 2,887 2,052
Financial assets impaired [member] | United States [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 3,229 3,135
Financial assets impaired [member] | Other countries [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 1 3
Residential mortgages [member] | Financial assets impaired [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 891 647
Consumer installment and other personal [member] | Financial assets impaired [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 467 409
Business and government loans [member] | Financial assets impaired [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 4,759 4,134
Allowance on impaired loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 974 653
Allowance on impaired loans [member] | Canada [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 663 461
Allowance on impaired loans [member] | United States [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 311 192
Allowance on impaired loans [member] | Residential mortgages [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 12 10
Allowance on impaired loans [member] | Consumer installment and other personal [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 160 168
Allowance on impaired loans [member] | Business and government loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 802 475
Gross carrying amount [member] | Financial assets impaired [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 7,091 5,843
Gross carrying amount [member] | Financial assets impaired [member] | Canada [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 3,550 2,513
Gross carrying amount [member] | Financial assets impaired [member] | United States [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 3,540 3,327
Gross carrying amount [member] | Financial assets impaired [member] | Other countries [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 1 3
Gross carrying amount [member] | Residential mortgages [member] | Financial assets impaired [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 903 657
Gross carrying amount [member] | Consumer installment and other personal [member] | Financial assets impaired [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans 627 577
Gross carrying amount [member] | Business and government loans [member] | Financial assets impaired [member]    
Disclosure of detailed information about financial instruments [line items]    
Total loans $ 5,561 $ 4,609