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Loans, Impaired Loans and Allowance for Credit Losses - Allowance For Credit Losses (Parenthetical) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Provision for credit losses $ 4,714 $ 4,051
Allowance for credit losses for other financial assets 191 200
Other Assets And Reversal of Impairment Loss [Member]    
Disclosure of detailed information about financial instruments [line items]    
Reversal of impairment loss (12) (11)
Residential mortgages personal loans credit cards total retail loans business and government excluding other assets [member]    
Disclosure of detailed information about financial instruments [line items]    
Provision for credit losses 4,714 4,051
Stage 2 [member]    
Disclosure of detailed information about financial instruments [line items]    
Amortized cost of financial assets before modification 2,833 3,504
Stage 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Amortized cost of financial assets before modification 899 726
Gross impaired loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Interest income on impaired loans $ 439 $ 443