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Employee Compensation - Share-Based Compensation - Additional Information (Detail)
$ / shares in Units, shares in Millions
 12 Months Ended
Oct. 31, 2025
CAD ($)
$ / shares
shares
Oct. 31, 2024
CAD ($)
$ / shares
shares
Disclosure of Sharebased Payment [Line Items]    
Weighted average fair value of options granted | $ / shares $ 18.46 $ 15.33
Other liabilities $ 37,549,000,000 $ 36,720,000,000
Weighted average exercise price, options | $ / shares $ 141 $ 118.5
Employee Stock Option Plan [Member]    
Disclosure of Sharebased Payment [Line Items]    
Employee compensation expense $ 16,000,000 $ 18,000,000
Share purchase plan [member]    
Disclosure of Sharebased Payment [Line Items]    
Employee compensation expense $ 48,000,000 $ 49,000,000
Percentage of employer matching contribution for contribution up to 6% 50.00%  
Percentage of employee contribution towards share ownership plans 6.00%  
Share purchase plan contribution vesting period 2 years  
Individual gross salary for employees contribution $ 75,000  
Description of employee ownership plan contribution 50% of employee contributions up to 6% of their individual gross salary to a maximum of $75,000. Our contributions during the first two years vest after two years of participation in the plan, with subsequent contributions vesting immediately.  
Common shares held in plan | shares 17.4 18.1
Mid-Term incentive plan [member]    
Disclosure of Sharebased Payment [Line Items]    
Employee compensation expense $ 1,525,000,000 $ 1,037,000,000
Units granted 5,800,000 6,700,000
Weighted average fair value of options granted | $ / shares $ 132.73 $ 111.66
Gains on hedge contract $ 672,000,000 $ 178,000,000
Mid-term incentive plan units outstanding 17,400,000 18,400,000
Intrinsic value of share other than options vested $ 2,352,000,000 $ 1,663,000,000
Mid-Term incentive plan [member] | Equity contracts [member]    
Disclosure of Sharebased Payment [Line Items]    
Employee compensation expense 853,000,000 859,000,000
Deferred incentive plans [member]    
Disclosure of Sharebased Payment [Line Items]    
Employee compensation expense $ 262,000,000 $ 139,000,000
Mid-term incentive plan units outstanding 5,000,000 5,100,000
Deferred incentive plan units granted 300,000 300,000
Weighted average fair value at measurement date $ 140.64 $ 121.18
Other liabilities 874,000,000 655,000,000
Gains on derivatives 232,000,000 107,000,000
Gains resulted in net employee compensation expense 30,000,000 32,000,000
Share ownership arrangements [Member] | Assets 1 [member] | Compensation trusts [member]    
Disclosure of Sharebased Payment [Line Items]    
Assets recognised 3,026,000,000 2,299,000,000
Deferred compensation arrangements [member] | Compensation trusts [member]    
Disclosure of Sharebased Payment [Line Items]    
Consolidated Trust Assets 297,000,000 313,000,000
Deferred compensation arrangements [member] | Assets 1 [member] | Compensation trusts [member]    
Disclosure of Sharebased Payment [Line Items]    
Assets recognised $ 259,000,000 $ 221,000,000