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Commitments, Guarantees, Pledged Assets, Provisions and Contingent Liabilities - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Aug. 22, 2023
USD ($)
Nov. 08, 2022
USD ($)
Oct. 31, 2024
CAD ($)
Oct. 31, 2025
CAD ($)
Disclosure of Commitments Pledged Assets Provisions and Contingent Liabilities [Line Items]        
Lease Commitments     $ 80 $ 128
Reversal of loss contingency accrual provision     1,190  
Reversal of loss contingency accrual provision after tax     875  
Litigation settlement pre-judgment interest 5.26%      
Litigation settlement post-judgment interest 4.74%      
Litigation settlement, amount awarded to other party $ 483 $ 564    
Reversal of legal provision accrual non-interest expenses     594  
Reversal of legal provision accrual interest expenses     $ 596