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Commitments, Guarantees and Pledged Assets - Additional Information (Detail) - CAD ($)	Oct. 31, 2025	Oct. 31, 2024
Underwriting commitments [member]
Disclosure of commitments and contingencies [Line Items]
Underwriting commitments	$ 1,045,000,000	$ 464,000,000
Securities lending [member]
Disclosure of commitments and contingencies [Line Items]
Securities lending transactions with third parties	95,000,000,000	70,000,000,000
Private equity funds 1 [member] | Top of range [member] | Investment commitments [member]
Disclosure of commitments and contingencies [Line Items]
Commitments	553,000,000	528,000,000
Credit risk [member] | Securities lending [member] | Joint ventures [member]
Disclosure of commitments and contingencies [Line Items]
credit related commitments	9,000,000,000	7,600,000,000
Credit risk [member] | Securities lending [member] | Joint ventures [member] | Bank of new york mellon [member]
Disclosure of commitments and contingencies [Line Items]
credit related commitments	$ 104,400,000,000	$ 77,600,000,000

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- Definition

Credit related commitments.

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No definition available.

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Namespace Prefix:	cm_
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Balance Type:	credit
Period Type:	instant

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- Definition

Disclosure of commitments and contingencies [Line Items]

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No definition available.

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- Definition

Indemnities to customer of joint ventures.

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No definition available.

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- Definition

Investment commitments.

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No definition available.

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

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- Definition

Underwriting commitments 1

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No definition available.

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