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Commitments, Guarantees and Pledged Assets - Summary of Contract Amounts of Credit-Related Arrangements (Parenthetical) (Detail) - CAD ($) $ in Billions | Oct. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Personal, home equity, and credit card lines [member] | Unutilized credit commitments [member] |  |
Disclosure of commitments and contingencies [Line Items] |  |
Capital commitment | $ 201.5 | $ 189.6

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- Definition Disclosure of commitments and contingencies [Line Items] + References No definition available. + Details
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Namespace Prefix: | cm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of future capital expenditures that the entity is committed to make. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | credit
Period Type: | instant

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

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