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Cash and deposits with financial institutions (Tables)
 6 Months Ended
Apr. 30, 2022
Text Block [Abstract]  
Summary of Cash and Deposits with Financial Institutions
  
  
As at
 
($ millions)
  
April 30
2022
 
  
January 31
2022
 
  
October 31
2021
 
Cash and
non-interest-bearing
deposits with financial institutions
   
$
10,643
 
    $ 10,563      $ 9,693  
Interest-bearing deposits with financial institutions
   
 
 
75,267
 
      88,490        76,630  
Total
   
$
  85,910
(1)
 
    $   99,053
(1)
 		    $   86,323
(1)
 
  (1)
Net of allowances of $2 (January 31, 2022 – $1; October 31, 2021 – $1).