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Provisions (Tables)
 12 Months Ended
Oct. 31, 2025
Text Block [Abstract]  
Summary of Provisions
($ millions)       
As at November 1, 2023
   $     573  
Provisions made during the year
     203  
Provisions utilized / released during the year
     (365 ) 
Balance as at October 31, 2024
   $ 411  
Provisions made during the year
  
 
422
 
Provisions utilized / released during the year
  
 
(165
) 
Balance as at October 31, 2025
  
$
668