v3.24.3
Summary of Material accounting policies, estimates and judgments - Additional Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Nov. 01, 2023
Oct. 31, 2024
Oct. 31, 2023
May 31, 2023
Nov. 01, 2022
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Increase in Other components of equity   $ 8,498 $ 6,852    
Pillar two model rules for international tax reform threshold minimum global tax       15.00%  
Cumulative reduction in retained earnings net of tax   88,608 81,715    
Non Usd Libor [Member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Non-derivative financial assets     29,500    
Non-derivative financial liabilities     24,700    
Derivative notional amount     2,154,300    
Authorized and committed undrawn commitments     $ 40,000    
Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application [member] | Estimated retrospective adjustments [member] | IFRS 17 [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Cumulative reduction in retained earnings net of tax         $ 2,400
Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application [member] | 2024 [member] | IFRS 17 [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Insurance contract liability cumulative impact of measurement         $ 1,800
Designated as FVTPL To Classified As FVTPL [member] | Financial assets at amortised cost, class [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Amount of reclassifications $ 2,000        
Designated as FVTPL To Classified As FVTPL [member] | Financial assets at fair value [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Amount of reclassifications 8,300        
Designated As FVTPL To Classified As FVOCI [member] | Financial assets at amortised cost, class [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Amount of reclassifications 300        
Designated As FVTPL To Classified As FVOCI [member] | Financial assets at fair value [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Amount of reclassifications 500        
FVOCI To Classified As FVTPL [member] | Financial assets at fair value [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Amount of reclassifications 1,700        
FVTPL To Designated As FVOCI [member] | Financial assets at fair value [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Amount of reclassifications $ 300        
Increase (decrease) due to changes in accounting policy [member] | IFRS 17 [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Increase in Other components of equity   $ 656      
Computer software [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Estimated useful lives of intangible assets   3 to 10 years      
Customer relationships [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Estimated useful lives of intangible assets   7 to 20 years      
Buildings [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Useful life of premises and equipment   25 to 50 years      
Computer equipment [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Useful life of premises and equipment   3 to 10 years      
Furniture Fixtures and Other Equipment [member]          
Significant Accounting Policies, Estimates and Judgments [Line Items]          
Useful life of premises and equipment   5 to 10 years