v3.26.1
Earnings per Share (Summary of Earnings Per Share) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2026
Jul. 31, 2025
Jul. 31, 2026
Jul. 31, 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 0 0 4,700,000
Weighted Average Exercise Price of Average Share Options Outstanding Excluded From Calculation of Earnings Per Share       $ 92.91
Net income available to common shareholders $ 4,521 $ 3,248 $ 12,512 $ 16,884
Weighted-average number of common shares outstanding (millions) 1,646,000,000.0 1,716,700,000 1,662,300,000 1,735,700,000
Basic earnings (loss) per share (Canadian dollars) $ 2.75 $ 1.89 $ 7.53 $ 9.73
Net income available to common shareholders including impact of dilutive securities $ 4,521 $ 3,248 $ 12,512 $ 16,884
Stock options potentially exercisable (millions) 6,200,000 2,200,000 5,300,000 1,300,000
Weighted-average number of common shares outstanding - diluted (millions) 1,652,200,000 1,718,900,000 1,667,600,000 1,737,000,000.0
Diluted earnings (loss) per share (Canadian dollars) $ 2.74 $ 1.89 $ 7.50 $ 9.72