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cm:Level2TextBlock: us-gaap:PropertyLiabilityReserveEstimatePolicy
Standard label: Property Liability Reserve Estimate, Policy [Policy Text Block]
Name: us-gaap:PropertyLiabilityReserveEstimatePolicy
Documentation: Disclosure of accounting policy amounts needed to provide for the estimated ultimate cost of settling property insurance claims relating to insured events that have occurred on or before a particular date (ordinarily, the statement of financial position date).
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:PropertyLiabilityReserveEstimatePolicy

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Labels
Label Role Language
Property Liability Reserve Estimate, 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 50 3 http://fasb.org/us-gaap/role/ref/legacyRef 235
FASB Accounting Standards Codification 944 210 S99 1 (SX 210.7-03.13(b)) http://fasb.org/us-gaap/role/ref/legacyRef 944
FASB Accounting Standards Codification 944 40 50 1 http://fasb.org/us-gaap/role/ref/legacyRef 944