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cm:Axis: us-gaap:ExternalCreditRatingByGroupingAxis
Standard label: External Credit Rating by Grouping [Axis]
Name: us-gaap:ExternalCreditRatingByGroupingAxis
Documentation: Information by external rating classified as investment grade or non investment grade.
Object type: cm:Axis
Data type: Text/String (xbrli:stringItemType)
Period type: For Period (duration)
Balance type: (no balance type)
Abstract: true
Workiva Wdesk Taxonomy Analyzer: us-gaap:ExternalCreditRatingByGroupingAxis

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Labels
Label Role Language
External Credit Rating by Grouping [Axis] http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 310 10 50 29 http://fasb.org/us-gaap/role/ref/legacyRef 310
FASB Accounting Standards Codification 326 20 50 5 http://www.xbrl.org/2009/role/commonPracticeRef 326
FASB Accounting Standards Codification 460 10 50 4 (a)(4) http://www.xbrl.org/2003/role/exampleRef 460
FASB Accounting Standards Codification 815 10 50 4K (a)(4) http://www.xbrl.org/2003/role/disclosureRef 815