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Earnings Per Share - Summary of Earnings Per Share (Detail) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Basic earnings per common share |  |  |
Net income attributable to common shareholders |  | $ 7,283 | $ 7,286
Foreign currency loss on redemption of Subordinated Additional Tier 1 Capital Notes | [1] | (22) |
Net income attributable to common shareholders used to calculate basic earnings per common share |  | $ 7,261 | $ 7,286
Weighted average number of common shares outstanding |  | 1,244 | 1,226
Basic earnings per common share | [2] | $ 5.84 | $ 5.94
Diluted earnings per common share |  |  |
Net income attributable to common shareholders used to calculate basic earnings per common share |  | $ 7,261 | $ 7,286
Dilutive impact of share-based payment options and others | [3] | (181) | (49)
Net income attributable to common shareholders (diluted) |  | $ 7,080 | $ 7,237
Weighted average number of common shares outstanding |  | 1,244 | 1,226
Dilutive impact of share-based payment options and others | [3] | 4 | 6
Weighted average number of diluted common shares outstanding |  | 1,248 | 1,232
Diluted earnings per common share | [2] | $ 5.67 | $ 5.87
[1] | Refer to Note 23 (b) for further details on the redemption of the equity instrument.
[2] | Earnings per share calculations are based on full dollar and share amounts.
[3] | Certain options were not included in the calculation of diluted earnings per share as they were anti-dilutive.

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