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Fair Value Measurement - Changes in Fair Value of Financial Assets and Liabilities in Level 3 (Parenthetical) (Detail) - Level 3 of fair value hierarchy [member] - CAD ($) $ in Millions | Jul. 31, 2025 | Apr. 30, 2025 | Jul. 31, 2024
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Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items] |  |  |
Deposits | $ 203 | $ 208 | $ 213
Bifurcated embedded derivative liabilities | 153 | 111 | 172
Other liabilities designated at FVTPL | $ 21 | $ 11 | $ 3

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- Definition Bifurcated embedded derivative liabilities included in Deposits. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Fair value option deposits. + References No definition available. + Details
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Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other Liabilities Designated At Fair Value Through Profit or Loss. + References No definition available. + Details
Name: | cm_OtherLiabilitiesDesignatedAtFairValueThroughProfitOrLoss
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |