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Earnings per share (Tables)
 12 Months Ended
Oct. 31, 2019
Text block [abstract]  
Summary of Earnings Per Share
 
$ millions, except per share amounts, for the year ended October 31
  
2019
 
 
2018
 
  
2017
 
Basic EPS
  
 
 
 
 
 
 
 
  
 
 
 
Net income attributable to equity shareholders
  
$
    5,096
 
 
$
5,267
 
  
$
4,699
 
Less: preferred share dividends and premiums
  
 
111
 
 
 
89
 
  
 
52
 
Net income attributable to common shareholders
  
 
4,985
 
 
 
5,178
 
  
 
4,647
 
Weighted-average common shares outstanding (thousands)
  
 
    444,324
 
 
 
443,082
 
  
 
412,636
 
Basic EPS
  
$
11.22
 
 
$
11.69
 
  
$
11.26
 
Diluted EPS
  
 
 
 
 
 
 
 
  
 
 
 
Net income attributable to common shareholders
  
$
    4,985
 
 
$
5,178
 
  
$
4,647
 
Weighted-average common shares outstanding (thousands)
  
 
444,324
 
 
 
443,082
 
  
 
412,636
 
Add: stock options potentially exercisable
(1)
(thousands)
  
 
702
 
 
 
1,111
 
  
 
827
 
Add: restricted shares and equity-settled consideration (thousands)
  
 
431
 
 
 
434
 
  
 
100
 
Weighted-average diluted common shares outstanding (thousands)
  
 
445,457
 
 
 
    444,627
 
  
 
    413,563
 
Diluted EPS
  
$
    11.19
 
 
$
11.65
 
  
$
11.24
 
(1)
Excludes average options outstanding of 2,319,723 with a weighted-average exercise price of $114.29 (2018: 688,123 with a weighted-average exercise price of $120.02; 2017: 729,807 with a weighted-average exercise price of $111.69), as the options’ exercise prices were greater than the average market price of common shares.