v3.22.2.2
Employee benefits - Pension and other post-employment benefits - Maturity Profile of Defined Benefit Pension Plan Obligation (Detail)
$ in Millions
 12 Months Ended
Oct. 31, 2022
CAD ($)
Participants
Disclosure of net defined benefit liability (asset) [line items]  
Number of plan participants | Participants 72,659
Actual benefit payments 2022 $ 607
Benefits expected to be paid 2023 678
Benefits expected to be paid 2024 702
Benefits expected to be paid 2025 724
Benefits expected to be paid 2026 748
Benefits expected to be paid 2027 767
Benefits expected to be paid 2028-2032 $ 4,096
Weighted average duration of defined benefit payments 12 years 6 months
Canada [member]  
Disclosure of net defined benefit liability (asset) [line items]  
Number of plan participants | Participants 66,616
Actual benefit payments 2022 $ 585
Benefits expected to be paid 2023 643
Benefits expected to be paid 2024 668
Benefits expected to be paid 2025 691
Benefits expected to be paid 2026 713
Benefits expected to be paid 2027 733
Benefits expected to be paid 2028-2032 $ 3,907
Weighted average duration of defined benefit payments 12 years 4 months 24 days
Foreign countries [member]  
Disclosure of net defined benefit liability (asset) [line items]  
Number of plan participants | Participants 6,043
Actual benefit payments 2022 $ 22
Benefits expected to be paid 2023 35
Benefits expected to be paid 2024 34
Benefits expected to be paid 2025 33
Benefits expected to be paid 2026 35
Benefits expected to be paid 2027 34
Benefits expected to be paid 2028-2032 $ 189
Weighted average duration of defined benefit payments 15 years 1 month 6 days