v3.24.3
Employee benefits - Pension and other post-employment benefits - Summary of Composition of Pension and Other Post-employment Benefit Expense (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Disclosure of pension and other post employment plan [Line Items]    
Total pension and other post-employment benefit expense $ 21,083 $ 18,853
Defined benefit pension plans [member] | Pension Expense [Member]    
Disclosure of pension and other post employment plan [Line Items]    
Current service costs 188 195
Net interest expense (income) (150) (162)
Administrative expense 18 9
Defined benefit pension expense 56 42
Defined contribution pension plans [Member] | Pension Expense [Member]    
Disclosure of pension and other post employment plan [Line Items]    
Defined contribution pension expense 426 323
Defined benefit and contribution pension plans [member] | Pension Expense [Member]    
Disclosure of pension and other post employment plan [Line Items]    
Total pension and other post-employment benefit expense 482 365
Other post employment benefit [member] | Other post employment benefit expense [Member]    
Disclosure of pension and other post employment plan [Line Items]    
Current service costs 34 33
Past service costs (6) (2)
Net interest expense (income) 81 77
Remeasurements of other long-term benefits 3 (1)
Defined benefit pension expense 112 107
Total pension and other post-employment benefit expense $ 112 $ 107