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Post-employment benefits
 9 Months Ended
Jul. 31, 2025
Text Block [Abstract]  
Post-employment benefits
Note 10. Post-employment benefits
The following tables provide details on the post-employment benefit expense recognized in the interim consolidated statement of income and on the remeasurements recognized in the interim consolidated statement of comprehensive income:
Defined benefit plan expense
   
For the three
months ended
          
For the nine
months ended
  
$ millions  
2025
Jul. 31
     2025
Apr. 30		     2024
Jul. 31		    
2025
Jul. 31
     2025
Apr. 30		     2024
Jul. 31		          
2025
Jul. 31
     2024
Jul. 31		    
2025
Jul. 31
     2024
Jul. 31		  
            Pension plans     Other
post-employment plans		          
Pension plans
     Other
post-employment plans
  
Current service cost
  
$
56
 
   $ 57     $ 47    
$
2
 
   $ 1     $ 1      
$
 
170
 
   $ 142    
$
4
 
   $ 3  
Net interest (income) expense
  
 
(17
)
     (20 )     (16 )  
 
5
 
     5       6      
 
(57
)
     (47 )  
 
15
 
     18  
Interest expense on effect of asset ceiling
  
 
–
 
     1       1    
 
–
 
     –       –      
 
2
 
     1    
 
–
 
     –  
Plan administration costs
  
 
1
 
     2       2    
 
–
 
     –       –      
 
5
 
     6    
 
–
 
     –  
Net defined benefit plan expense
recognized in net income
  
$
   40
 
   $    40     $    34    
$
  7
 
   $   6     $   7      
$
  120
 
   $   102    
$
  19
 
   $   21  
Defined contribution plan expense
    For the three
months ended		         For the nine
months ended		  
$ millions  
2025
Jul. 31
     2025
Apr. 30		     2024
Jul. 31		        
2025
Jul. 31
     2024
Jul. 31		  
Defined contribution pension plans
  
$
20
 
   $ 23     $ 17      
$
63
 
   $ 55  
Government pension plans 
(1)
  
 
57
 
     58       52      
 
171
 
     147  
Total defined
contribution
plan expense
  
$
  77
 
   $   81     $   69      
$
  234
 
   $   202  
(1)
Includes Canada Pension Plan, Quebec Pension Plan, and U.S. Federal Insurance Contributions Act.
Remeasurement of employee defined benefit plans
(1)

    For the three
months ended		          
For the nine
months ended
  
$ millions  
2025
Jul. 31
     2025
Apr. 30		     2024
Jul. 31		    
2025
Jul. 31
     2025
Apr. 30		     2024
Jul. 31		          
2025
Jul. 31
     2024
Jul. 31
 (2)
    
2025
Jul. 31
     2024
Jul. 31		  
            Pension plans     Other
post-employment plans		           Pension plans     Other
post-employment plans
  
Net actuarial gains (losses) on defined benefit obligations
  
$
  68
 
   $    260     $   (294 )  
$
  4
 
   $ 8     $
 
 (15 )    
$
  162
 
   $   (726 )  
$
  5
 
   $ (38 )
Net actuarial gains (losses) on plan assets
  
 
3
 
     (334 )     549    
 
–
 
     –       –      
 
(132
)
     913    
 
–
 
     –  
Changes in asset ceiling excluding interest income
  
 
–
 
     –       (2 )  
 
–
 
     –       –      
 
1
 
     (2 )  
 
–
 
     –  
Net remeasurement gains (losses) recognized in OCI
  
$
71
 
   $ (74 )   $ 253    
$
4
 
   $   8     $   (15 )    
$
 
 
 
31
   $
 
 185    
$
5
 
   $   (38 )
(1)
The Canadian post-employment defined benefit plans are remeasured on a quarterly basis for changes in the discount rate and for actual asset returns. All other Canadian plans’ actuarial assumptions and foreign plans’ actuarial assumptions are updated at least annually.
(2)
Includes the transfer of the accumulated actuarial losses of $5 million to retained earnings upon the settlement of a pension plan for one of our subsidiaries.