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Securities - Summary of Profit or Loss Recognized on FVOCI Securities (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Disclosure of financial assets [line items] |  |
Total | $ (14) | $ 43
IFRS9 [member] |  |
Disclosure of financial assets [line items] |  |
Realized gains | 50 | 64
Realized losses | (27) | (26)
(Provision for) reversal of credit losses on debt securities | (3) | 3
Total | $ 20 | $ 41

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- Definition Gains (losses) from debt securities measured at fair value through other comprehensive income and amortized cost, net + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Net realized gains on fair value through other comprehensive income securities. + References No definition available. + Details
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Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Net realized losses on fair value through other comprehensive income securities. + References No definition available. + Details
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Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Provision for credit losses on debt securities at fair value through other comprehensive income. + References No definition available. + Details
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Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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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- Details
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