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Deposits - Summary of Deposits and Components (Parenthetical) (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure Of Deposits [Line items]    
Deposit $ 808,124 $ 764,857
Purchased notes, net 500 600
Business And Government Deposits [member]    
Disclosure Of Deposits [Line items]    
Deposit 457,284 435,499
Deposits structured liabilities 17,300 15,500
Payable on fixed date [member]    
Disclosure Of Deposits [Line items]    
Deposit 391,893  
Payable on fixed date [member] | Business And Government Deposits [member]    
Disclosure Of Deposits [Line items]    
Deposit 219,816  
Payable on fixed date [member] | Bank recapitalization (bail-in) conversion regulations [member]    
Disclosure Of Deposits [Line items]    
Deposit 67,000 61,100
Denominated in U.S. dollars [member]    
Disclosure Of Deposits [Line items]    
Deposit 298,300 288,400
Denominated in other foreign currencies [member]    
Disclosure Of Deposits [Line items]    
Deposit $ 70,000 $ 52,900