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Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Detail) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Basic Earnings Per Common Share    
Net income attributable to bank shareholders $ 8,709 $ 7,318
Dividends on preferred shares and distributions on other equity instruments (436) (386)
Net income available to common shareholders $ 8,273 $ 6,932
Weighted-average number of common shares outstanding 721,926,000 727,738,000
Basic earnings per common share $ 11.46 $ 9.52
Diluted Earnings Per Common Share    
Net income available to common shareholders $ 8,273 $ 6,932
Weighted-average number of common shares outstanding 721,926,000 727,738,000
Dilutive impact of stock options    
Stock options potentially exercisable [1] 5,897,000 3,556,000
Common shares potentially repurchased [1] (4,556,000) (2,759,000)
Weighted-average number of diluted common shares outstanding 723,267,000 728,535,000
Diluted earnings per common share $ 11.44 $ 9.51
[1] The dilutive effect of stock options was calculated using the treasury stock method. In computing diluted earnings per common share, we excluded average stock options outstanding of 477,101 with a weighted-average exercise price of $150.96 for the year ended October 31, 2025 (3,220,995 with a weighted-average exercise price of $130.33 for the year ended October 31, 2024), as the average share price in each of the two years did not exceed the exercise price.