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Earnings per Share - Summary of Earnings Per Share (Detail) - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended			9 Months Ended
	Jul. 31, 2025	Apr. 30, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Basic earnings per share
Net income attributable to equity shareholders	$ 2,094	$ 1,998	$ 1,786	$ 6,255	$ 5,241
Less: Preferred share dividends and distributions on other equity instruments	82	78	63	248	191
Net income attributable to common shareholders	$ 2,012	$ 1,920	$ 1,723	$ 6,007	$ 5,050
Weighted-average common shares outstanding	932,258	938,495	943,467	937,588	937,696
Basic earnings per share	$ 2.16	$ 2.05	$ 1.83	$ 6.41	$ 5.39
Diluted earnings per share
Net income attributable to common shareholders	$ 2,012	$ 1,920	$ 1,723	$ 6,007	$ 5,050
Weighted-average common shares outstanding	932,258	938,495	943,467	937,588	937,696
Add: Stock options potentially exercisable	5,260	4,253	2,317	4,991	1,596
Weighted-average diluted common shares outstanding	937,518	942,748	945,784	942,579	939,292
Diluted earnings per share	$ 2.15	$ 2.04	$ 1.82	$ 6.37	$ 5.38

X

- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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Adjustment to profit (loss) for non-participating preference share dividends to calculate profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Preference shares [member]; Profit (loss)]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The potential dilutive effect on the weighted average number of ordinary shares that relate to the assumed exercise of the entity's share options.

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