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cm:Level3TextBlock: us-gaap:OpenOptionContractsWrittenScheduleOfInvestmentsTextBlock
Standard label: Open Option Contracts Written, Schedule of Investments [Table Text Block]
Name: us-gaap:OpenOptionContractsWrittenScheduleOfInvestmentsTextBlock
Documentation: Tabular disclosure of the information required in the supplementary schedule applicable to management investment companies listing written option contracts.
Object type: cm:Level3TextBlock
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:OpenOptionContractsWrittenScheduleOfInvestmentsTextBlock

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Labels
Label Role Language
Open Option Contracts Written, Schedule of Investments [Table Text Block] http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 946 320 S99 3 (SX 210.12-12B) http://fasb.org/us-gaap/role/ref/legacyRef 946