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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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- Definition

Deposits.

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Disclosure of contractual obligation

+ References

No definition available.

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Namespace Prefix:	cm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Data Type:	na
Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type: