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Land, Buildings, Equipment, Other Depreciable Assets, and Right-Of-Use Assets (Summary of Land, Buildings, Equipment, and Other Depreciable Assets) (Details) - 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 $ 6,039  
Balance at end of year 6,015 $ 6,039
Land, buildings, equipment, other depreciable assets, and right-of-use assets 10,132 9,837
Gross carrying amount [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 9,920 9,581
Additions 989 1,216
Disposals (146) (338)
Fully depreciated assets (786) (625)
Foreign currency translation adjustments and other (211) 86
Balance at end of year 9,766 9,920
Accumulated depreciation and impairment/losses [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 3,881 3,989
Depreciation charge for the year 774 735
Disposals (138) (313)
Impairment losses 29 19
Fully depreciated assets (786) (625)
Foreign currency translation adjustments and other (9) 76
Balance at end of year 3,751 3,881
Land [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 925  
Balance at end of year 853 925
Land, buildings, equipment, other depreciable assets, and right-of-use assets 1,453 1,558
Land [member] | Gross carrying amount [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 925 919
Additions 0 0
Disposals 0 0
Fully depreciated assets 0 0
Foreign currency translation adjustments and other (72) 6
Balance at end of year 853 925
Land [member] | Accumulated depreciation and impairment/losses [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 0 0
Depreciation charge for the year 0 0
Disposals 0 0
Impairment losses 0 0
Fully depreciated assets 0 0
Foreign currency translation adjustments and other 0 0
Balance at end of year 0 0
Buildings [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 1,708  
Balance at end of year 1,698 1,708
Land, buildings, equipment, other depreciable assets, and right-of-use assets 5,174 4,826
Buildings [member] | Gross carrying amount [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 2,787 2,555
Additions 173 216
Disposals (5) (9)
Fully depreciated assets (46) (22)
Foreign currency translation adjustments and other (153) 47
Balance at end of year 2,756 2,787
Buildings [member] | Accumulated depreciation and impairment/losses [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 1,079 992
Depreciation charge for the year 100 93
Disposals (2) (9)
Impairment losses 1 0
Fully depreciated assets (46) (22)
Foreign currency translation adjustments and other (74) 25
Balance at end of year 1,058 1,079
Computer equipment [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 452  
Balance at end of year 409 452
Land, buildings, equipment, other depreciable assets, and right-of-use assets 450 499
Computer equipment [member] | Gross carrying amount [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 851 917
Additions 167 153
Disposals (42) (65)
Fully depreciated assets (226) (143)
Foreign currency translation adjustments and other (13) (11)
Balance at end of year 737 851
Computer equipment [member] | Accumulated depreciation and impairment/losses [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 399 418
Depreciation charge for the year 176 179
Disposals (42) (62)
Impairment losses 21 11
Fully depreciated assets (226) (143)
Foreign currency translation adjustments and other 0 (4)
Balance at end of year 328 399
Furniture fixtures, and other depreciable assets [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 900  
Balance at end of year 1,000 900
Land, buildings, equipment, other depreciable assets, and right-of-use assets 1,000 900
Furniture fixtures, and other depreciable assets [member] | Gross carrying amount [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 1,567 1,511
Additions 328 362
Disposals (92) (137)
Fully depreciated assets (167) (171)
Foreign currency translation adjustments and other 6 2
Balance at end of year 1,642 1,567
Furniture fixtures, and other depreciable assets [member] | Accumulated depreciation and impairment/losses [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 667 787
Depreciation charge for the year 198 165
Disposals (90) (134)
Impairment losses 5 7
Fully depreciated assets (167) (171)
Foreign currency translation adjustments and other 29 13
Balance at end of year 642 667
Leasehold improvements [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 2,054  
Balance at end of year 2,055 2,054
Land, buildings, equipment, other depreciable assets, and right-of-use assets 2,055 2,054
Leasehold improvements [member] | Gross carrying amount [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 3,790 3,679
Additions 321 485
Disposals (7) (127)
Fully depreciated assets (347) (289)
Foreign currency translation adjustments and other 21 42
Balance at end of year 3,778 3,790
Leasehold improvements [member] | Accumulated depreciation and impairment/losses [member]    
Disclosure of Detailed Information About Property, Plant and Equipment [line items]    
Balance at beginning of year 1,736 1,792
Depreciation charge for the year 300 298
Disposals (4) (108)
Impairment losses 2 1
Fully depreciated assets (347) (289)
Foreign currency translation adjustments and other 36 42
Balance at end of year $ 1,723 $ 1,736