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Designated Accounting Hedges - Summary of Hedge Accounting Impact on the Consolidated Statement of Comprehensive Income (Parenthetical) (Detail) - CAD ($) $ in Millions	12 Months Ended
	Oct. 31, 2025	Oct. 31, 2024
Disclosure of information about hedge accounting impact on statement of comprehensive income abstract
Amount reclassified from AOCI to Net Income	$ 0	$ 0

X

- Definition

Disclosure of information about hedge accounting impact on statement of comprehensive income.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Reclassified From Accumulated Other Comprehensive Income

+ References

No definition available.

+ Details

Name:	cm_ReclassifiedFromAccumulatedOtherComprehensiveIncome
Namespace Prefix:	cm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration