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Loans - Additional Information (Detail) - CAD ($) $ in Millions	Jul. 31, 2025	Oct. 31, 2024
Downside Scenario [Member]
Disclosure of detailed information about borrowings [line items]
ECL expected value	$ 1,021	$ 737
Probability weighting percentage	100.00%
Base Scenario [Member]
Disclosure of detailed information about borrowings [line items]
ECL expected value	$ 496	$ 246
Probability weighting percentage	100.00%

X

- 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

X

- Definition

Probability weighting percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	cm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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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X

- Details

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

X

- Details

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