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Share-based Payments - Summary of Stock Option Activity and Related Information (Parenthetical) (Detail) - $ / shares | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Employee stock options [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Weighted-average share price at the date of exercise | $ 96.04 | $ 65.04

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The weighted average share price at the date of exercise for share options that are exercised in a share-based payment arrangement. [Refer: Types of share-based payment arrangements [domain]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_c&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=cm_EmployeeStockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |