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Earnings per Share - Summary of Earnings Per Share (Parenthetical) (Detail) - $ / shares | 3 Months Ended
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Jan. 31, 2025 | Oct. 31, 2024 | Jan. 31, 2024
Earnings per share [abstract] |  |  |
Outstanding options excluded from calculation of diluted earnings per share | 1,615,008 | 0 | 7,202,031
Weighted average Exercise price of average outstanding share options excluded from the calculation of diluted earnings per share | $ 94.35 | $ 0 | $ 63.27

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- Definition Disclosure of instruments with potential future dilutive effect not included in calculation of diluted earnings per share + References No definition available. + Details
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- Definition Weighted average exercise price of average outstanding share options excluded from calculation of diluted earnings per share. + References No definition available. + Details
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Namespace Prefix: | cm_
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- References No definition available. + Details
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