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Provisions - Additional Information (Detail) - CAD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2021
Oct. 31, 2025
Oct. 31, 2025
Disclosure of other provisions [line items]      
Expense of restructuring activities   $ 373  
Net expenses of restructuring activities   270  
Amount of taxable temporary differences associated with investments in subsidiaries, associates and interests in joint ventures for which deferred tax liabilities have not been recognized   176 $ 176
Legal proceedings provision [member]      
Disclosure of other provisions [line items]      
New provisions, other provisions $ 34   142
Other operating segment [Member]      
Disclosure of other provisions [line items]      
Non-current restructuring provision   $ 272 $ 272