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Interest income and expense (Tables)
 9 Months Ended
Jul. 31, 2021
Text Block [Abstract]  
Details of Interest Income and Interest Expense from Financial Instruments
     For the three months ended     For the nine months ended  
    
July 31, 2021
     April 30, 2021     July 31, 2020    
July 31, 2021
     July 31, 2020  
($ millions)
  
Interest
income
    
Interest
expense
     Interest
income		     Interest
expense		     Interest
income		     Interest
expense		    
Interest
income
    
Interest
expense
     Interest
income		     Interest
expense		  
Measured at amortized cost
(1)
  
$
5,818
 
  
$
1,828
 
   $ 5,897     $ 1,962     $ 6,630     $ 2,688    
$
17,927
 
  
$
5,916
 
   $ 21,833     $ 9,855  
Measured at FVOCI
(1)
  
 
171
 
  
 
–
 
     181       –       209       –    
 
540
 
  
 
–
 
     830       –  
   
 
5,989
 
  
 
1,828
 
     6,078       1,962       6,839       2,688    
 
18,467
 
  
 
5,916
 
     22,663       9,855  
Other
  
 
112
(2)
 
  
 
56
(3)
 
     109
(2)
 		     49
(3)
 		     147
(2)
 		     45
(3)
 		  
 
333
(2)
 
  
 
140
(3)
 
     397
(2)
 		     143
(3)
 
Total
  
$
  6,101
 
  
$
  1,884
 
   $   6,187     $   2,011     $   6,986     $   2,733    
$
  18,800
 
  
$
  6,056
 
   $   23,060     $   9,998  
  (1)
The interest income/expense on financial assets/liabilities are calculated using the effective interest method.
  (2)
Includes dividend income on equity securities.
  (3)
Includes interest on lease liabilities for the three months ended July 31, 2021 – $26 (April 30, 2021 – $27; July 31, 2020 – $30) and for the nine months ended July 31, 2021 – $80 (July 31, 2020 – $90).