v3.22.2.2
Goodwill and other intangible assets - Summary of Changes in Carrying Amount of Goodwill by Cash Generating Units (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance $ 10,854 $ 11,302
Acquisitions 930  
Dispositions (19) (7)
Currency translations 512 (441)
Ending balance 12,277 10,854
Canadian Banking [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 2,557 2,557
Acquisitions 17  
Ending balance 2,574 2,557
Caribbean Banking [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 1,600 1,719
Dispositions   (3)
Currency translations 159 (116)
Ending balance 1,759 1,600
Canadian Wealth Management [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 577 587
Currency translations 12 (10)
Ending balance 589 577
Global asset management [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 1,964 2,001
Acquisitions 33  
Currency translations (69) (37)
Ending balance 1,928 1,964
U.S. Wealth Management (including City National) [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 2,768 2,978
Dispositions (19)  
Currency translations 278 (210)
Ending balance 3,027 2,768
International wealth management [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 115 121
Acquisitions 880  
Dispositions   (4)
Currency translations 47 (2)
Ending balance 1,042 115
Insurance [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 112 112
Ending balance 112 112
Investor & Treasury Services [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 148 149
Currency translations (1) (1)
Ending balance 147 148
Capital Markets [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 1,013 1,078
Currency translations 86 (65)
Ending balance $ 1,099 $ 1,013