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IFRS 7 - Disclosure - Liquidity Risk - Summary of Contractual Maturity Profile of On-Balance Sheet Assets, Liabilities and Equity at their Carrying Values (Parenthetical) (Detail) - CAD ($) $ in Billions | Jul. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Personal [member] |  |
Disclosure of contractual obligations [line items] |  |
Deposits | $ 256.1 | $ 252.9
Business And Government Deposits And Secured Borrowings [member] |  |
Disclosure of contractual obligations [line items] |  |
Deposits | 509.5 | 492.0
Bank [member] |  |
Disclosure of contractual obligations [line items] |  |
Deposits | $ 27.1 | $ 20.0

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Namespace Prefix: | cm_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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