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Employee Compensation - Share-Based Compensation (Tables)
 12 Months Ended
Oct. 31, 2025
Text Block [Abstract]  
Summary of Information about our Stock Option Plan
The following table summarizes information about our Stock Option Plan:
 
(Canadian $, except as noted)          
       2025
                   2024  
     
Number of
stock options
    
Weighted-average

exercise price
     Number of
 stock options		    
  Weighted-average

exercise price		  
Outstanding at beginning of year
   
 
6,554,492
 
  
$
110.14
 
     6,312,576     $ 105.26  
Granted
   
 
716,633
 
  
 
141.00
 
     1,113,853       118.50  
Exercised
   
 
(1,520,631
) 
  
 
95.74
 
     (811,652 )      82.74  
Forfeited/expired/cancelled
   
 
(51,360
) 
  
 
122.96
   
     (60,285 )      122.22  
Outstanding at end of year
   
 
5,699,134
 
  
 
117.75
 
      6,554,492       110.14  
Exercisable at end of year
   
 
2,245,942
 
  
 
103.82
 
     2,856,460       95.27  
Available for grant
   
 
8,900,641
 
             9,565,914          
Summary of Options Outstanding and Exercisable by Range of Exercise Price
Options outstanding and exercisable at October 31, 2025 by range of exercise price were as follows:
 
(Canadian $, except as noted)            
          
             
      2025
  
     
Options outstanding
     
Options exercisable
  
Range of exercise prices   
Number of
stock options
     
Weighted-
average remaining
contractual life (years)
    
Weighted-average

exercise price
     
Number of
stock options
     
Weighted-average

exercise price
  
$70.01 to $90.00
   
 
380,829
 
   
 
3.0
 
  
$
89.25
 
   
 
380,829
 
   
$
89.25
 
$90.01 to $100.00
   
 
698,899
 
   
 
4.1
 
  
 
97.08
 
   
 
698,899
 
   
 
97.08
 
$100.01 to $120.00
   
 
1,842,015
 
   
 
6.2
  
  
 
111.19
 
   
 
779,359
 
   
 
101.23
 
$120.01 to $140.00
   
 
2,060,758
 
   
 
6.7
 
  
 
127.80
 
   
 
386,855
 
   
 
135.58
 
$140.01 and over
   
 
716,633
 
   
 
9.1
 
  
 
141.00
 
   
 
–
 
   
 
–
 
Summary of Further Information about our Stock Option Plan
The following table summarizes additional information about our Stock Option Plan:
 
(Canadian $ in millions, except as noted)   
2025
     2024  
Unrecognized compensation cost for
non-vested
stock option awards
   
$
      10
 
   $ 12  
Cash proceeds from stock options exercised
   
 
146
 
     67  
Weighted-average share price for stock options exercised (in dollars)
   
 
    152.59
 
         120.40  
Summary of Ranges of Values used for each Option Pricing Assumption
The fair value of options granted was estimated using a binomial option pricing model. The weighted-average fair value of options granted during the years ended October 31, 2025 and 2024 was $18.46 and $15.33, respectively. To determine the fair value of the stock option tranches on the grant date, the following ranges of values were used as inputs for each option pricing assumption:
 
     
2025
      2024  
Expected dividend yield
   
 
      3.6%
 
      4.5%  
Expected share price volatility
   
 
16.7%
 
      17.4% – 17.6%  
Risk-free rate of return
   
 
2.8%
 
      3.3% – 3.4%  
Expected period until exercise (in years)
   
 
6.5 – 7.0
 
      6.5 – 7.0