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Contingent liabilities and provisions (Tables)
 12 Months Ended
Oct. 31, 2022
Legal proceedings provision [member]  
Statement [LineItems]  
Disclosure of Changes in Provisions
The following table presents changes in our legal provisions:
 
$ millions, for the year ended October 31
   
2022
      2021  
Balance at beginning of year
   
$
301
 
    $ 151  
Additional new provisions recognized
   
 
151
 
      169  
Less:
                  
Amounts incurred and charged against existing provisions
   
 
(172
)
  
   (13 ) 
Unused amounts reversed and other adjustments
   
 
(5
)
  
   (6 ) 
Balance at end of year
   
$
    275
 
    $     301  
Restructuring provision [member]  
Statement [LineItems]  
Disclosure of Changes in Provisions
The following table presents changes in the restructuring provision:
 
$ millions, for the year ended October 31
   
2022
      2021  
Balance at beginning of year
   
$
 99
 
    $ 222  
Additional new provisions recognized
   
 
6
 
      14  
Less:
                  
Amounts incurred and charged against existing provisions
   
 
(59
)
          (112 ) 
Unused amounts reversed
   
 
(11
)
      (25 ) 
Balance at end of year
   
$
35
 
    $ 99