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Earnings per share (Tables)
 9 Months Ended
Jul. 31, 2021
Text Block [Abstract]  
Summary of Earnings Per Share
      For the three months ended      For the nine months ended  
($ millions)
   
July 31
2021
      April 30
2021		      July 31
2020		     
July 31
2021
      July 31
2020		  
Basic earnings per common share
                                             
Net income attributable to common shareholders
   
$
  2,426
 
    $   2,289      $   1,332     
$
  6,980
 
    $   4,837  
Weighted average number of common shares outstanding
(millions)
   
 
1,215
 
      1,213        1,211     
 
1,213
 
      1,212  
Basic earnings per common share
(1)
(in dollars)
   
$
2.00
 
    $ 1.89      $ 1.10     
$
5.75
 
    $ 3.99  
Diluted earnings per common share
                                             
Net income attributable to common shareholders
   
$
2,426
 
    $ 2,289      $ 1,332     
$
6,980
 
    $ 4,837  
Dilutive impact of share-based payment options and others
(2)
   
 
9
 
      13        (43 )    
 
41
 
      (13 ) 
Net income attributable to common shareholders (diluted)
   
$
2,435
 
    $ 2,302      $ 1,289     
$
7,021
 
    $ 4,824  
Weighted average number of common shares outstanding
(millions)
   
 
1,215
 
      1,213        1,211     
 
1,213
 
      1,212  
Dilutive impact of share-based payment options and others
(2)
(millions)
   
 
8
 
      10        34     
 
12
 
      32  
Weighted average number of diluted common shares outstanding
(millions)
   
 
1,223
 
      1,223        1,245     
 
1,225
 
      1,244  
Diluted earnings per common share
(1)
(in dollars)
   
$
1.99
 
    $ 1.88      $ 1.04     
$
5.73
 
    $ 3.88  
  (1)
Earnings per share calculations are based on full dollar and share amounts.
  (2)
Certain options as well as acquisition-related put/call options that the Bank may settle at its own discretion by issuing common shares were not included in the calculation of diluted earnings per share as they were anti-dilutive.