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Contingent liabilities and provisions (Tables)
 12 Months Ended
Oct. 31, 2025
Legal proceedings provision [member]  
Statement [LineItems]  
Disclosure of Changes in Provisions
Legal provisions
The following table presents changes in our legal provisions:
 
$ millions, for the year ended October 31
   
2025
      2024  
Balance at beginning of year
   
$
108
 
    $ 140  
Additional new provisions recognized
   
 
82
 
      41  
Less:
      
Amounts incurred and charged against existing provisions
   
 
(40
)
      (70 ) 
Unused amounts reversed and other adjustments
(1)
   
 
(46
) 
      (3 ) 
Balance at end of year
   
$
  104
 
    $   108  
 
(1)
Includes foreign currency translation adjustments.