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Premises and Equipment - Summary of Premises and Equipment (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 6,249  
Ending balance 6,252 $ 6,249
Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 12,886 13,123
Additions/lease modifications 1,007 991
Disposals (51) (107)
Fully depreciated assets (709) (1,150)
Foreign exchange and other 48 29
Ending balance 13,181 12,886
Accumulated depreciation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (6,637) (6,882)
Disposals 39 70
Depreciation 1,015 970
Fully depreciated assets (709) (1,150)
Foreign exchange and other [1] 25 5
Ending balance (6,929) (6,637)
Net carrying amount [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 6,249  
Ending balance 6,252 6,249
Land and buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,376 2,370
Additions/lease modifications 86 81
Disposals (18) (48)
Fully depreciated assets (7) (32)
Foreign exchange and other 8 5
Ending balance 2,445 2,376
Land and buildings [member] | Accumulated depreciation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,242) (1,238)
Disposals 16 29
Depreciation 74 64
Fully depreciated assets (7) (32)
Foreign exchange and other [1] 20 1
Ending balance (1,313) (1,242)
Land and buildings [member] | Net carrying amount [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,134  
Ending balance 1,132 1,134
Computer equipment [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,480 2,923
Additions/lease modifications 358 270
Disposals (17) (22)
Fully depreciated assets (534) (694)
Foreign exchange and other 5 3
Ending balance 2,292 2,480
Computer equipment [member] | Accumulated depreciation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,779) (2,228)
Disposals 15 12
Depreciation 270 261
Fully depreciated assets (534) (694)
Foreign exchange and other [1]   (4)
Ending balance (1,500) (1,779)
Computer equipment [member] | Net carrying amount [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 701  
Ending balance 792 701
Other equipment [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 911 1,060
Additions/lease modifications 67 117
Disposals (3) (11)
Fully depreciated assets (61) (257)
Foreign exchange and other 3 2
Ending balance 917 911
Other equipment [member] | Accumulated depreciation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (509) (704)
Disposals 1 8
Depreciation 82 76
Fully depreciated assets (61) (257)
Foreign exchange and other [1] (5) (6)
Ending balance (524) (509)
Other equipment [member] | Net carrying amount [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 402  
Ending balance 393 402
Leasehold improvements [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,675 2,413
Additions/lease modifications 209 352
Disposals (11) (26)
Fully depreciated assets (10) (71)
Foreign exchange and other 8 7
Ending balance 2,871 2,675
Leasehold improvements [member] | Accumulated depreciation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,436) (1,356)
Disposals 7 21
Depreciation 190 167
Fully depreciated assets (10) (71)
Foreign exchange and other [1] 2 5
Ending balance (1,611) (1,436)
Leasehold improvements [member] | Net carrying amount [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,239  
Ending balance 1,260 1,239
Right-of-use assets [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 4,444 4,357
Additions/lease modifications 287 171
Disposals (2)  
Fully depreciated assets (97) (96)
Foreign exchange and other 24 12
Ending balance 4,656 4,444
Right-of-use assets [member] | Accumulated depreciation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,671) (1,356)
Depreciation 399 402
Fully depreciated assets (97) (96)
Foreign exchange and other [1] 8 9
Ending balance (1,981) (1,671)
Right-of-use assets [member] | Net carrying amount [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,773  
Ending balance $ 2,675 $ 2,773
[1] Includes impairment charges.