XML 90 R80.htm IDEA: XBRL DOCUMENT v3.25.2

Earnings per Share - Summary of Earnings Per Share (Parenthetical) (Detail) - $ / shares	3 Months Ended			9 Months Ended
	Jul. 31, 2025	Apr. 30, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Earnings per share [abstract]
Outstanding options excluded from calculation of diluted earnings per share	0	2,422,512	2,553,244	2,150,302	2,553,244
Weighted average Exercise price of average outstanding share options excluded from the calculation of diluted earnings per share	$ 0	$ 94.35	$ 70.05	$ 94.35	$ 70.05

X

- Definition

Disclosure of instruments with potential future dilutive effect not included in calculation of diluted earnings per share

+ References

No definition available.

+ Details

Name:	cm_DisclosureOfInstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShare
Namespace Prefix:	cm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average exercise price of average outstanding share options excluded from calculation of diluted earnings per share.

+ References

No definition available.

+ Details

Name:	cm_WeightedAverageExercisePriceOfAverageOutstandingShareOptionsExcludedFromCalculationOfDilutedEarningsPerShare
Namespace Prefix:	cm_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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