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Loans - Additional Information (Detail) - CAD ($) $ in Millions | Apr. 30, 2025 | Oct. 31, 2024
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Downside Scenario [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
ECL expected value | $ 897 | $ 737
Probability weighting percentage | 100.00% |
Base Scenario [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
ECL expected value | $ 339 | $ 246
Probability weighting percentage | 100.00% |

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- Definition Allowance account for credit losses of financial assets higher (lower) from total recognized IFRS Nine expected credit losses. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Probability weighting percentage. + References No definition available. + Details
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Namespace Prefix: | cm_
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Balance Type: | na
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Period Type: | duration

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

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