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v3.25.3

Segmented and geographic information - Detailed Report of Segments and Geographic Areas (Parenthetical) (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Capital markets [Member] |  |
Disclosure of operating segments [line items] |  |
Taxable equivalent basis adjustment | $ 0 | $ 16

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- Definition Taxable equivalent basis adjustment amount. + References No definition available. + Details
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Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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_DisclosureOfOperatingSegmentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_SegmentsAxis=cm_CapitalMarketsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |