XML 138 R75.htm IDEA: XBRL DOCUMENT
v3.25.3

IFRS 7 - Disclosure - Credit Risk - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Disclosure of credit risk exposure [line items] |  |
Interest recognized on impaired loan | $ 138 | $ 121
Interest recognized on loans before impaired | 110 | 126
Current [member] |  |
Disclosure of credit risk exposure [line items] |  |
Interest income | 218 | 189
Canada [member] |  |
Disclosure of credit risk exposure [line items] |  |
Interest income | 110 | 89
Interest recognized on loans before impaired | 71 | 77
Foreign countries [member] |  |
Disclosure of credit risk exposure [line items] |  |
Interest income | 108 | 100
Interest recognized on loans before impaired | $ 39 | $ 49

X
- Definition Gross interest income would have been recorded. + References No definition available. + Details
Name: | cm_GrossInterestIncomeWouldHaveBeenRecorded
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Interest income before impairement. + References No definition available. + Details
Name: | cm_InterestIncomeOnLoansBeforeImpaired
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Interest Income Recognized on Impaired Financial Assets Accrued. + References No definition available. + Details
Name: | cm_InterestIncomeRecognizedOnImpairedFinancialAssetsAccrued
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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
Name: | ifrs-full_DisclosureOfCreditRiskExposureLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=ifrs-full_CurrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=ifrs-full_ForeignCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |