v3.26.1
Employee Benefits - Summary of Financial Information related to Principal Plans (Detail) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2026
Jan. 31, 2026
Apr. 30, 2025
Apr. 30, 2026
Apr. 30, 2025
Disclosure of defined benefit plans [line items]          
Actuarial gains (losses) on employee benefit plans in other comprehensive income $ 64 $ 268 $ (255) $ 332 $ 5
Pension plans [member]          
Disclosure of defined benefit plans [line items]          
Defined benefit service cost [1] 60 60 61 120 145
Interest on net defined benefit (asset) liability [1] (6) (6) (3) (12) (7)
Other [1] 3 3 3 6 6
Defined benefit expense [1] 57 57 61 114 144
Defined contribution expense [1] 58 56 53 114 102
Actuarial gains (losses) on employee benefit plans in other comprehensive income [1],[2] 65 275 (246) 340 27
Other benefit plans [member]          
Disclosure of defined benefit plans [line items]          
Defined benefit service cost [1] 5 5 6 10 11
Interest on net defined benefit (asset) liability [1] 16 16 16 32 31
Other [1] (1)   (1) (1)  
Defined benefit expense [1] 20 21 21 41 42
Defined contribution expense [1]         1
Actuarial gains (losses) on employee benefit plans in other comprehensive income [1],[2] $ (1) $ (7) $ (9) $ (8) $ (22)
[1] Other plans operated by certain subsidiaries of the Bank are not considered material and are not included in this note.
[2] Changes in discount rates and return on plan assets are reviewed and updated on a quarterly basis. In the absence of legislated changes, all other assumptions are updated annually.