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Commitments, Guarantees, Pledged Assets, Provisions and Contingent Liabilities - Summary of Changes In Provision Balance (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of Commitments Pledged Assets Provisions and Contingent Liabilities [Line Items]    
Balance at beginning of year $ 259 $ 1,578
Additional provisions/increase in provisions 159 168
Provisions utilized (208) (229)
Amounts reversed (41) (1,255)
Foreign exchange and other 2 (3)
Balance at end of year 171 259
Restructuring and severance [member]    
Disclosure of Commitments Pledged Assets Provisions and Contingent Liabilities [Line Items]    
Balance at beginning of year 164 335
Additional provisions/increase in provisions 125 101
Provisions utilized (129) (210)
Amounts reversed (36) (59)
Foreign exchange and other   (3)
Balance at end of year 124 164
Legal [member]    
Disclosure of Commitments Pledged Assets Provisions and Contingent Liabilities [Line Items]    
Balance at beginning of year 95 1,243
Additional provisions/increase in provisions 34 67
Provisions utilized (79) (19)
Amounts reversed (5) (1,196)
Foreign exchange and other 2  
Balance at end of year $ 47 $ 95