v3.26.1
Employee Benefits (Summary of Remeasurement of Defined Benefit Plans) (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2026
Apr. 30, 2025
Principal Pension Plans [Member]        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurement gain/(loss) - financial $ 200 $ 297 $ 435 $ 158
Remeasurement gain/(loss) - return on plan assets less interest income (110) (366) (421) (184)
Changes in asset limitation and minimum funding requirement 0 3 0 0
Amounts Recognized in Other Comprehensive Income for Remeasurement of Defined Benefit Plans 90 (66) 14 (26)
Principal post retirement benefit plan [Member]        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurement gain/(loss) - financial 10 12 18 5
Remeasurement gain/(loss) - return on plan assets less interest income 0 0 0 0
Changes in asset limitation and minimum funding requirement 0 0 0 0
Amounts Recognized in Other Comprehensive Income for Remeasurement of Defined Benefit Plans 10 12 18 5
Other Pension Plans [Member]        
Disclosure of net defined benefit liability (asset) [line items]        
Remeasurement gain/(loss) - financial 8 14 7 4
Remeasurement gain/(loss) - return on plan assets less interest income 0 0 0 0
Changes in asset limitation and minimum funding requirement 0 0 0 0
Amounts Recognized in Other Comprehensive Income for Remeasurement of Defined Benefit Plans $ 8 $ 14 $ 7 $ 4