v3.26.1
Employee Benefits (Summary of Employee Benefit Plans Expenses) (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2026
Jul. 31, 2025
Jul. 31, 2026
Jul. 31, 2025
Disclosure of defined benefit plans [line items]        
Defined Benefit Plan Expenses $ 248 $ 210 $ 837 $ 761
Principal Pension Plans [Member]        
Disclosure of defined benefit plans [line items]        
Service cost - benefits earned 68 69 205 207
Net interest cost (income) on net defined benefit liability (asset) (12) (13) (35) (38)
Interest cost on asset limitation and minimum funding requirement 0 0 0 0
Past service cost 0 0 0 0
Defined benefit administrative expenses 3 3 8 8
Defined Benefit Plan Expenses 59 59 178 177
Principal post retirement benefit plan [Member]        
Disclosure of defined benefit plans [line items]        
Service cost - benefits earned 1 1 4 4
Net interest cost (income) on net defined benefit liability (asset) 4 5 12 13
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 5 6 16 17
Other pension and post retirement benefit plans [Member]        
Disclosure of defined benefit plans [line items]        
Service cost - benefits earned 5 4 15 14
Net interest cost (income) on net defined benefit liability (asset) 4 5 12 16
Interest cost on asset limitation and minimum funding requirement 1 1 1 1
Past service cost 0 1 2 1
Defined benefit administrative expenses 1 1 4 4
Defined Benefit Plan Expenses $ 11 $ 12 $ 34 $ 36