v3.26.1
Earnings per Share (Summary of Earnings Per Share) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2026
Apr. 30, 2025
Types Of Antidilutive Instruments [Domain]        
Disclosure Of Instruments With Potential Future Dilutive Effect Not Included In Calculation Of Diluted Earnings Per Share [Line Items]        
Average outstanding options excluded from calculation of diluted earnings per share 0 4,700,000 0 7,200,000
Weighted Average Exercise Price of Average Share Options Outstanding Excluded From Calculation of Earnings Per Share   $ 92.91   $ 89.12
Net income available to common shareholders $ 4,049 $ 10,929 $ 7,991 $ 13,636
Weighted-average number of common shares outstanding (millions) 1,660,700,000 1,740,500,000 1,670,600,000 1,745,300,000
Basic earnings (loss) per share (Canadian dollars) $ 2.44 $ 6.28 $ 4.78 $ 7.81
Net income available to common shareholders including impact of dilutive securities $ 4,049 $ 10,929 $ 7,991 $ 13,636
Stock options potentially exercisable (millions) 4,800,000 1,200,000 4,800,000 1,000,000.0
Weighted-average number of common shares outstanding - diluted (millions) 1,665,500,000 1,741,700,000 1,675,400,000 1,746,300,000
Diluted earnings (loss) per share (Canadian dollars) $ 2.43 $ 6.27 $ 4.77 $ 7.81