v3.24.3
Employee benefits - Pension and other post-employment benefits - Maturity Profile of Defined Benefit Pension Plan Obligation (Detail)
$ in Millions
 12 Months Ended
Oct. 31, 2024
CAD ($)
Participants
Disclosure of net defined benefit liability (asset) [line items]  
Number of plan participants | Participants 75,889
Actual benefit payments 2024 $ 675
Benefits expected to be paid 2025 755
Benefits expected to be paid 2026 775
Benefits expected to be paid 2027 795
Benefits expected to be paid 2028 818
Benefits expected to be paid 2029 839
Benefits expected to be paid 2030-2034 $ 4,444
Weighted average duration of defined benefit payments 13 years 3 months 18 days
Canada [member]  
Disclosure of net defined benefit liability (asset) [line items]  
Number of plan participants | Participants 70,000
Actual benefit payments 2024 $ 638
Benefits expected to be paid 2025 715
Benefits expected to be paid 2026 735
Benefits expected to be paid 2027 755
Benefits expected to be paid 2028 777
Benefits expected to be paid 2029 796
Benefits expected to be paid 2030-2034 $ 4,202
Weighted average duration of defined benefit payments 13 years 2 months 12 days
Foreign countries [member]  
Disclosure of net defined benefit liability (asset) [line items]  
Number of plan participants | Participants 5,889
Actual benefit payments 2024 $ 37
Benefits expected to be paid 2025 40
Benefits expected to be paid 2026 40
Benefits expected to be paid 2027 40
Benefits expected to be paid 2028 41
Benefits expected to be paid 2029 43
Benefits expected to be paid 2030-2034 $ 242
Weighted average duration of defined benefit payments 14 years 6 months