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Securities - Schedule of Fair Value of Debt Securities Measured and Equity Securities Designated at FVOCI (Parenthetical) (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of financial assets [abstract] |  |
Allowance for credit losses for debt securities measured at FVOCI | $ 23 | $ 19

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- Definition Allowance for credit losses for debt securities measured at fair value through other comprehensive income loss, net. + References No definition available. + Details
Name: | cm_AllowanceForCreditLossesForDebtSecuritiesMeasuredAtFairValueThroughOtherComprehensiveIncomeLossNet
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration