XML 162 R99.htm IDEA: XBRL DOCUMENT
v3.25.3

Fair Value Measurement - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Disclosure of detailed information about financial instruments [line items] |  |
Estimated contractual amount payable at maturity of FVTPL deposits | $ 505 | $ 3,859
Held for Trading for Trading Purpose [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period | 285 | 922
Obligations related to securities sold short [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period | $ 2,111 | 2,068
Contingent settlement of largest derivative asset [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Percentage of reasonably possible increase (decrease) in unobservable input, assets | 100.00% |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets | $ (10) |
Interest rate and foreign exchange derivatives [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Percentage of reasonably possible increase (decrease) in unobservable input, assets | 10.00% |
Percentage of reasonably possible increase in unobservable input, liabilities | 10.00% |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets | $ (6) |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities | (8) |
Level 3 of fair value hierarchy [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
FVTPL liabilities (losses) | (47) | (299)
Net gain (loss) net of hedges was realized for FVTPL assets and FVTPL liabilities | 63 | 34
Level 3 of fair value hierarchy [member] | Corporate equity limited partenrship [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Increase in fair value measurement assets | 182 | 145
Decrease in fair value measurement assets | 182 | 145
Level 3 of fair value hierarchy [member] | Embedded derivatives [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Increase in fair value measurement assets | 143 | 149
Decrease in fair value measurement assets | 122 | 142
Level 3 of fair value hierarchy [member] | Cumulative translation adjustment [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Accumulated FVTPL liabilities (losses) | (172) | (125)
Level 3 of fair value hierarchy [member] | Corporate debt [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Decrease in fair value measurement assets | 27 | 0
Increase in fair value measurement assets | $ 35 | $ 0

X
- Definition Fair value option liabilities estimated contractual amount payable at maturity. + References No definition available. + Details
Name: | cm_FairValueOptionLiabilitiesEstimatedContractualAmountPayableAtMaturity
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Net gains (losses) realized for FVO assets and FVO liabilities, net of hedges, included in the consolidated statement of income. + References No definition available. + Details
Name: | cm_GainsLossesOnFairValueOptionAssetsAndLiabilitiesNetOfHedges
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Level 3 sensitivity relating to investments in derivatives and embedded derivatives (decrease in fair value). + References No definition available. + Details
Name: | cm_Level3SensitivityDerivativesAndEmbeddedDerivativesDecrease
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Level 3 sensitivity relating to investments in derivatives and embedded derivatives (increase in fair value). + References No definition available. + Details
Name: | cm_Level3SensitivityDerivativesAndEmbeddedDerivativesIncrease
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Level 3 sensitivity fair value of corporate debt instrument decrease. + References No definition available. + Details
Name: | cm_Level3SensitivityFairValueOfCorporateDebtInstrumentDecrease
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Level3 sensitivity fair value of corporate debt instrument increase. + References No definition available. + Details
Name: | cm_Level3SensitivityFairValueOfCorporateDebtInstrumentIncrease
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Level 3 sensitivity relating to investments in limited partnerships (decrease in fair value). + References No definition available. + Details
Name: | cm_Level3SensitivityLimitedPartnershipDecrease
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Level 3 sensitivity relating to investments in limited partnerships (increase in fair value). + References No definition available. + Details
Name: | cm_Level3SensitivityLimitedPartnershipIncrease
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The accumulated increase (decrease) in the fair value of financial liabilities that is attributable to changes in the credit risk of the liabilities. [Refer: Credit risk [member]; Market risk [member]; Increase (decrease) in fair value of financial liability, attributable to changes in credit risk of liability] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 10 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_10_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 10A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_10A_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AccumulatedChangesInFairValueOfFinancialLiabilityAttributableToChangesInCreditRiskOfLiability
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in the fair value of a financial liability that is attributable to changes in the credit risk of that liability. [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 10A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_10A_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ChangesInFairValueOfFinancialLiabilityAttributableToChangesInCreditRiskOfLiability
Namespace Prefix: | ifrs-full_
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_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of increase (decrease) in the fair value measurement of assets due to a reasonably possible increase in an unobservable input. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleIncreaseInUnobservableInputAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of increase (decrease) in the fair value measurement of liabilities due to a reasonably possible increase in an unobservable input. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleIncreaseInUnobservableInputLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage of a reasonably possible increase in an unobservable input used in fair value measurement of assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of a reasonably possible increase in an unobservable input used in fair value measurement of liabilities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_TransfersOutOfLevel1IntoLevel2OfFairValueHierarchyAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_TradingSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cm_ObligationsRelatedToSecuritiesSoldShortMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cm_ContingentSettlementOfLargestDerivativeAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cm_InterestRateAndForeignExchangeDerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level3OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cm_CorporateEquityLimitedPartenrshipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cm_EmbeddedDerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cm_CumulativeTranslationAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cm_CorporateAndOtherDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |