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Provisions (Tables)
 12 Months Ended
Oct. 31, 2021
Text Block [Abstract]  
Summary of Provisions
($ millions)       
As at November 1, 2019
   $ 210  
Provisions made during the year
     244  
Provisions utilized / released during the year
     (329 ) 
Balance as at October 31, 2020
   $ 125  
Provisions made during the year
  
 
306
 
Provisions utilized / released during the year
  
 
(135
 )
Balance as at October 31, 2021
  
$
   296