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cm:Level2TextBlock: us-gaap:ConsolidationSubsidiariesOrOtherInvestmentsConsolidatedEntitiesPolicy
Standard label: Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block]
Name: us-gaap:ConsolidationSubsidiariesOrOtherInvestmentsConsolidatedEntitiesPolicy
Documentation: Disclosure of accounting policy for subsidiaries or other investments that are consolidated, including the accounting treatment for intercompany accounts or transactions and any noncontrolling interest.
Object type: cm:Level2TextBlock
Data type: Text Block (HTML) (nonnum:textBlockItemType)
Period type: For Period (duration)
Balance type: (no balance type)
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:ConsolidationSubsidiariesOrOtherInvestmentsConsolidatedEntitiesPolicy

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Labels
Label Role Language
Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 235 10 S99 1 (SX 210.4-08(a)) http://www.xbrl.org/2003/role/disclosureRef 235
FASB Accounting Standards Codification 235 10 50 3 http://fasb.org/us-gaap/role/ref/legacyRef 235
FASB Accounting Standards Codification 810 10 50 1 http://www.xbrl.org/2003/role/disclosureRef 810
FASB Accounting Standards Codification 810 10 S99 2 (SX 210.3A-02) http://www.xbrl.org/2003/role/disclosureRef 810
FASB Accounting Standards Codification 810 10 S99 3 (SX 210.3A-03) http://www.xbrl.org/2003/role/disclosureRef 810
FASB Accounting Standards Codification 810 10 S99 4 (SX 210.3A-04) http://www.xbrl.org/2003/role/disclosureRef 810