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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of detailed information about intangible assets [line items]    
Beginning balance $ 7,892  
Impairment 0 $ 0
Ending balance 7,584 7,892
Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 12,149 12,032
Additions 637 841
Impairment (199) [1] (188)
Disposals/Retirements (206) (538)
Foreign currency adjustments and other 410 2
Ending balance 12,791 12,149
Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (4,257) (4,020)
Amortization 896 1,030
Impairment (9) [1] (91)
Disposals/Retirements 68 614
Foreign currency adjustments and other 131 (88)
Ending balance (5,207) (4,257)
Fund management contracts [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance [2] 4,415  
Ending balance [2] 4,415 4,415
Fund management contracts [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance [2] 4,415 4,415
Ending balance [2] 4,415 4,415
Indefinite life intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 163  
Ending balance 163 163
Indefinite life intangible assets [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 163 163
Ending balance 163 163
Computer software [member]    
Disclosure of detailed information about intangible assets [line items]    
Impairment 97  
Computer software [member] | Finite life intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance [3] 3,033  
Ending balance [3] 2,791 3,033
Computer software [member] | Finite life intangible assets [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 5,777 5,639
Additions 637 840
Impairment (199) [1] (188)
Disposals/Retirements (170) (538)
Foreign currency adjustments and other 390 24
Ending balance 6,435 5,777
Computer software [member] | Finite life intangible assets [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (2,744) (2,566)
Amortization 828 958
Impairment (9) [1] (91)
Disposals/Retirements 32 614
Foreign currency adjustments and other 113 (75)
Ending balance (3,644) (2,744)
Other intangible assets [member] | Finite life intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 281  
Ending balance 215 281
Other intangible assets [member] | Finite life intangible assets [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,794 1,815
Additions   1
Disposals/Retirements (36)  
Foreign currency adjustments and other 20 (22)
Ending balance 1,778 1,794
Other intangible assets [member] | Finite life intangible assets [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (1,513) (1,454)
Amortization 68 72
Disposals/Retirements 36  
Foreign currency adjustments and other 18 (13)
Ending balance $ (1,563) $ (1,513)
[1] In the current year, the Bank recognized an impairment loss of $165 million pre-tax in relation to its agreement to sell banking operations in Colombia, Costa Rica and Panama. Refer to Note 35 for details.
[2] Fund management contracts are attributable to the previously acquired Dynamic Funds business (formerly DundeeWealth Inc.), MD Financial Management Inc., and Jarislowsky Fraser Limited.
[3] Computer software comprises purchased software of $262 (2024 – $194), internally generated software of $1,633 (2024 – $1,939), and in process software not subject to amortization of $896 (2024 – $900).