v3.24.1.1.u2
Employee Benefits (Summary of Employee Benefit Plans Expenses) (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2024
Apr. 30, 2023
Disclosure of defined benefit plans [line items]        
Defined Benefit Plan Expenses $ 205 $ 183 $ 487 $ 420
Principal Pension Plans [Member]        
Disclosure of defined benefit plans [line items]        
Service cost - benefits earned 54 62 108 124
Net interest cost (income) on net defined benefit liability (asset) (21) (25) (41) (50)
Interest cost on asset limitation and minimum funding requirement 3 5 6 10
Past service cost 35 0 35 0
Defined benefit administrative expenses 2 3 4 5
Defined Benefit Plan Expenses 73 45 112 89
Principal post retirement benefit plan [Member]        
Disclosure of defined benefit plans [line items]        
Service cost - benefits earned 1 1 2 2
Net interest cost (income) on net defined benefit liability (asset) 5 5 10 10
Interest cost on asset limitation and minimum funding requirement 0 0 0 0
Past service cost 0 0 0 0
Defined benefit administrative expenses 0 0 0 0
Defined Benefit Plan Expenses 6 6 12 12
Other pension and post retirement benefit plans [Member]        
Disclosure of defined benefit plans [line items]        
Service cost - benefits earned 4 4 8 8
Net interest cost (income) on net defined benefit liability (asset) 6 5 12 11
Interest cost on asset limitation and minimum funding requirement 1 1 2 2
Past service cost 0 0 0 0
Defined benefit administrative expenses 1 2 2 3
Defined Benefit Plan Expenses $ 12 $ 12 $ 24 $ 24