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Property and Equipment - Summary of Property Plant 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 [1] $ 5,252  
Ending balance [1] 4,881 $ 5,252
Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 10,367 10,517
Additions 753 684
Disposals/Retirements (798) [2] (631)
Foreign currency adjustments and other 233 (203)
Ending balance 10,555 10,367
Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (5,115) (4,875)
Depreciation 683 730
Disposals/Retirements 306 372
Foreign currency adjustments and other 182 (118)
Ending balance (5,674) (5,115)
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,073  
Ending balance 637 1,073
Land and buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,736 1,813
Additions 194 120
Disposals/Retirements (481) [2] (149)
Foreign currency adjustments and other (129) (48)
Ending balance 1,320 1,736
Land and buildings [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (663) (686)
Depreciation 36 49
Disposals/Retirements 44 50
Foreign currency adjustments and other 28 (22)
Ending balance (683) (663)
Equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 519  
Ending balance 608 519
Equipment [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,780 1,809
Additions 144 232
Disposals/Retirements (82) [2] (183)
Foreign currency adjustments and other 44 (78)
Ending balance 1,886 1,780
Equipment [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,261) (1,268)
Depreciation 83 94
Disposals/Retirements 67 75
Foreign currency adjustments and other 1 (26)
Ending balance (1,278) (1,261)
Technology assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 271  
Ending balance 267 271
Technology assets [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 633 705
Additions 88 73
Disposals/Retirements (25) [2] (155)
Foreign currency adjustments and other 126 10
Ending balance 822 633
Technology assets [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (362) (381)
Depreciation 133 140
Disposals/Retirements 17 145
Foreign currency adjustments and other 77 (14)
Ending balance (555) (362)
Leasehold improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 689  
Ending balance 744 689
Leasehold improvements [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,877 1,854
Additions 117 134
Disposals/Retirements (92) [2] (67)
Foreign currency adjustments and other 112 (44)
Ending balance 2,014 1,877
Leasehold improvements [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,188) (1,152)
Depreciation 113 116
Disposals/Retirements 71 40
Foreign currency adjustments and other 40 (40)
Ending balance (1,270) (1,188)
Right-of-use assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,700  
Ending balance 2,625 2,700
Right-of-use assets [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 4,341 4,336
Additions 210 125
Disposals/Retirements (118) [2] (77)
Foreign currency adjustments and other 80 (43)
Ending balance 4,513 4,341
Right-of-use assets [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,641) (1,388)
Depreciation 318 331
Disposals/Retirements 107 62
Foreign currency adjustments and other 36 (16)
Ending balance $ (1,888) $ (1,641)
[1] Includes $39 (2024 – $36) of investment property.
[2] Includes a net impairment loss recorded in Q1 2025 related to the agreement to sell the banking operations in Colombia, Costa Rica and Panama. Refer to Note 35 for details.