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Land, Buildings, Equipment, Other Depreciable Assets, and Right-Of-Use Assets (Summary of Right of Use Assets) (Details) - Right-of-use assets [member] - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year $ 3,798 $ 3,842
Additions 500 424
Depreciation (583) (572)
Reassessments, modifications, and variable lease payment adjustments 349 131
Terminations and impairment 0 (1)
Foreign currency translation adjustments and other 53 (28)
Balance at end of year 4,117 3,798
Land [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 633 709
Additions 3 3
Depreciation (92) (97)
Reassessments, modifications, and variable lease payment adjustments 54 21
Terminations and impairment 0 0
Foreign currency translation adjustments and other 2 (3)
Balance at end of year 600 633
Buildings [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 3,118 3,101
Additions 490 373
Depreciation (478) (462)
Reassessments, modifications, and variable lease payment adjustments 295 130
Terminations and impairment 0 (1)
Foreign currency translation adjustments and other 51 (25)
Balance at end of year 3,476 3,118
Computer equipment [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 47 32
Additions 7 48
Depreciation (13) (13)
Reassessments, modifications, and variable lease payment adjustments 0 (20)
Terminations and impairment 0 0
Foreign currency translation adjustments and other 0 0
Balance at end of year $ 41 $ 47