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Post-Employment Benefits - Summary of Defined Benefit Plan Expense (Detail) - CAD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2025
Oct. 31, 2024
Jan. 31, 2024
Pension plan [member]      
Disclosure of defined benefit plans [line items]      
Current service cost $ 57 $ 48 $ 48
Net interest (income) expense (20) (16) (16)
Interest expense on effect of asset ceiling 1    
Plan administration costs 2 2 2
Net defined benefit plan expense recognized in net income 40 34 34
Other post employment benefit plans [member]      
Disclosure of defined benefit plans [line items]      
Current service cost 1 2 1
Net interest (income) expense 5 6 6
Net defined benefit plan expense recognized in net income $ 6 $ 8 $ 7