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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

X

- 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

X

- 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

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

X

- Details

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