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Employee Benefits (Summary of Remeasurement of Defined Benefit Plans) (Details) - CAD ($)
$ in Millions
12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Principal Pension Plans [Member]    
Disclosure of net defined benefit liability (asset) [line items]    
Remeasurement gains (losses) - financial $ 15 $ (1,155)
Remeasurement gains (losses) - demographic 0 0
Remeasurement gains (losses) - experience (107) (92)
Remeasurement gains (losses) - return on plan assets less interest income 42 986
Changes in asset limitation and minimum funding requirement 0 206
Total (50) (55)
Principal post-retirement benefit plan [Member]    
Disclosure of net defined benefit liability (asset) [line items]    
Remeasurement gains (losses) - financial (5) (40)
Remeasurement gains (losses) - demographic 0 0
Remeasurement gains (losses) - experience 1 0
Remeasurement gains (losses) - return on plan assets less interest income 0 0
Changes in asset limitation and minimum funding requirement 0 0
Total (4) (40)
Other pension plans [Member]    
Disclosure of net defined benefit liability (asset) [line items]    
Remeasurement gains (losses) - financial (16) (220)
Remeasurement gains (losses) - demographic 14 1
Remeasurement gains (losses) - experience 29 (20)
Remeasurement gains (losses) - return on plan assets less interest income 38 177
Changes in asset limitation and minimum funding requirement (4) 35
Total $ 61 $ (27)