XML 198 R135.htm IDEA: XBRL DOCUMENT
v3.25.3

Deposits - Summary of Deposits and Components (Parenthetical) (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Disclosure Of Deposits [Line items] |  |
Deposit | $ 808,124 | $ 764,857
Purchased notes, net | 500 | 600
Business And Government Deposits [member] |  |
Disclosure Of Deposits [Line items] |  |
Deposit | 457,284 | 435,499
Deposits structured liabilities | 17,300 | 15,500
Payable on fixed date [member] |  |
Disclosure Of Deposits [Line items] |  |
Deposit | 391,893 |
Payable on fixed date [member] | Business And Government Deposits [member] |  |
Disclosure Of Deposits [Line items] |  |
Deposit | 219,816 |
Payable on fixed date [member] | Bank recapitalization (bail-in) conversion regulations [member] |  |
Disclosure Of Deposits [Line items] |  |
Deposit | 67,000 | 61,100
Denominated in U.S. dollars [member] |  |
Disclosure Of Deposits [Line items] |  |
Deposit | 298,300 | 288,400
Denominated in other foreign currencies [member] |  |
Disclosure Of Deposits [Line items] |  |
Deposit | $ 70,000 | $ 52,900

X
- Definition Deposits. + References No definition available. + Details
Name: | cm_Deposits1
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Disclosure Of Deposits [Line items] + References No definition available. + Details
Name: | cm_DisclosureOfDepositsLineItems
Namespace Prefix: | cm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Purchase of notes net. + References No definition available. + Details
Name: | cm_PurchaseOfNotesNet
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of liabilities recognised in the entity's financial statements relating to its interests in structured entities. [Refer: Liabilities; Total for all unconsolidated structured entities [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 29 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_29_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_LiabilitiesRecognisedInEntitysFinancialStatementsInRelationToStructuredEntities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=cm_BusinessAndGovernmentDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=cm_PayableOnFixedDateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cm_ComponentsOfRegulatoryCapitalAxis=cm_BankRecapitalizationBailinConversionRegulationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=cm_OtherForeignCurrenciesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |