Earnings per share - Summary of Earnings Per Share (Detail) - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Oct. 31, 2022	Oct. 31, 2021
Basic earnings per share
Net income	$ 15,807	$ 16,050
Dividends on preferred shares and distributions on other equity instruments	(252)	(260)
Net income attributable to non-controlling interests	(13)	(12)
Net income available to common shareholders	$ 15,547	$ 15,781
Weighted average number of common shares (in thousands)	1,403,654	1,424,343
Basic earnings per share (in dollars)	$ 11.08	$ 11.08
Diluted earnings per share
Net income available to common shareholders	$ 15,547	$ 15,781
Weighted average number of common shares (in thousands)	1,403,654	1,424,343
Stock options	1,918	1,737
Issuable under other share-based compensation plans	462	655
Average number of diluted common shares (in thousands)	1,406,034	1,426,735
Diluted earnings per share (in dollars)	$ 11.06	$ 11.06
Equity attributable to shareholders [member]
Basic earnings per share
Net income	$ 15,794	$ 16,038
Dividends on preferred shares and distributions on other equity instruments	$ (247)	$ (257)

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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