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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
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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
Name: | cm_DisclosureOfInformationAboutHedgeAccountingImpactOnStatementOfComprehensiveIncomeAbstract
Namespace Prefix: | cm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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