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Employee Benefits - Summary of Cash Contributions and Payments made by Bank to Principal Plans (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of net defined benefit liability (asset) [line items]    
Contributions [1] $ 489 $ 308
SPP [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Contributions 158 69
All other plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Contributions 64 47
Other benefit plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Contributions 61 62
Defined contribution pension and other benefit plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Contributions $ 206 184
Defined contribution pension contributions funded from pension plan surplus [Member]    
Disclosure of net defined benefit liability (asset) [line items]    
Contributions   $ (54)
[1] Based on preliminary estimates, the Bank expects to make contributions of $158 million to the SPP (excluding the defined contribution provision), $79 million to all other defined benefit pension plans, $66 million to other benefit plans and $217 million to all defined contribution plans for the year ending October 31, 2026.