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Goodwill and 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 $ 4,925  
Amortization 1,152 $ 1,112
Ending balance 4,758 4,925
Customer-related intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 296  
Ending balance 213 296
Core deposit [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,916  
Ending balance 1,626 1,916
Software amortizing [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 2,006  
Ending balance 2,143 2,006
Software under development [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 417  
Ending balance 532 417
Other intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 290  
Ending balance 244 290
Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 11,516 12,370
Additions 1,048 852
Fully amortized intangibles (780) (1,729)
Foreign exchange and other 41 23
Ending balance 11,825 11,516
Gross carrying amount [member] | Customer-related intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 852 850
Fully amortized intangibles (16)  
Foreign exchange and other   2
Ending balance 836 852
Gross carrying amount [member] | Core deposit [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 3,563 3,553
Foreign exchange and other 28 10
Ending balance 3,591 3,563
Gross carrying amount [member] | Software amortizing [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 6,096 7,071
Additions 71 22
Transfers 821 688
Fully amortized intangibles (673) (1,696)
Foreign exchange and other 12 11
Ending balance 6,327 6,096
Gross carrying amount [member] | Software under development [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 417 324
Additions 938 782
Transfers (821) (688)
Foreign exchange and other (2) (1)
Ending balance 532 417
Gross carrying amount [member] | Other intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 588 572
Additions 39 48
Fully amortized intangibles (91) (33)
Foreign exchange and other 3 1
Ending balance 539 588
Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (6,591) (7,154)
Amortization 1,152 1,112
Write-downs 76 26
Fully amortized intangibles (780) (1,729)
Foreign exchange and other 28 28
Ending balance (7,067) (6,591)
Accumulated depreciation and amortisation [member] | Customer-related intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (556) (487)
Amortization 70 62
Write-downs 14 4
Fully amortized intangibles (16)  
Foreign exchange and other (1) 3
Ending balance (623) (556)
Accumulated depreciation and amortisation [member] | Core deposit [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (1,647) (1,295)
Amortization 305 342
Foreign exchange and other 13 10
Ending balance (1,965) (1,647)
Accumulated depreciation and amortisation [member] | Software amortizing [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (4,090) (5,073)
Amortization 739 676
Write-downs 13 22
Fully amortized intangibles (673) (1,696)
Foreign exchange and other 15 15
Ending balance (4,184) (4,090)
Accumulated depreciation and amortisation [member] | Other intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (298) (299)
Amortization 38 32
Write-downs 49  
Fully amortized intangibles (91) (33)
Foreign exchange and other 1  
Ending balance $ (295) $ (298)