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Cash and deposits with financial institutions (Tables)
 12 Months Ended
Oct. 31, 2021
Text Block [Abstract]  
Summary of Cash and Deposits with Financial Institutions
As at October 31 ($ millions)  
2021
    
2020
  
Cash and
non-interest-bearing
deposits with financial institutions
  
$
  9,693
 
   $   11,123  
Interest-bearing deposits with financial institutions
  
 
76,630
 
     65,337  
Total
  
$
  86,323
(1)
 
   $ 76,460
(1)
 
 
(1)
Net of allowances of $1 (2020 – $1).