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cm:Concept: us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterest
Standard label: Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Noncontrolling Interest
Name: us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterest
Documentation: Amount of tax (expense) benefit of other than temporary impairment loss (OTTI) on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive income loss and attributable to noncontrolling interest.
Object type: cm:Concept
Data type: Monetary (xbrli:monetaryItemType)
Period type: For Period (duration)
Balance type: Debit
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterest

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Labels
Label Role Language
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Noncontrolling Interest http://www.xbrl.org/2003/role/label en-US
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Noncontrolling Interest, Total http://www.xbrl.org/2003/role/totalLabel en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 220 10 45 10A (g) http://fasb.org/us-gaap/role/ref/legacyRef 220
FASB Accounting Standards Codification 220 10 45 11 http://fasb.org/us-gaap/role/ref/legacyRef 220
FASB Accounting Standards Codification 320 10 35 35 http://fasb.org/us-gaap/role/ref/legacyRef 320