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cm:Concept: us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax
Standard label: Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, before Tax
Name: us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax
Documentation: Amount, before tax and reclassification adjustment, of unrealized gain (loss) from increase (decrease) in instrument-specific credit risk of financial liability measured under fair value option.
Object type: cm:Concept
Data type: Monetary (xbrli:monetaryItemType)
Period type: For Period (duration)
Balance type: Credit
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionUnrealizedGainLossArisingDuringPeriodBeforeTax

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Labels
Label Role Language
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, before Tax http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 220 10 45 10A (l) http://www.xbrl.org/2003/role/disclosureRef 220
FASB Accounting Standards Codification 220 10 45 11 http://www.xbrl.org/2003/role/disclosureRef 220
FASB Accounting Standards Codification 825 10 45 5 http://www.xbrl.org/2003/role/disclosureRef 825
FASB Accounting Standards Codification 825 10 50 30 (d)(1) http://www.xbrl.org/2003/role/disclosureRef 825