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cm:Member: us-gaap:AccumulatedOtherThanTemporaryImpairmentAttributableToNoncontrollingInterestMember
Standard label: Accumulated Other-than-Temporary Impairment Attributable to Noncontrolling Interest [Member]
Name: us-gaap:AccumulatedOtherThanTemporaryImpairmentAttributableToNoncontrollingInterestMember
Documentation: Accumulated other comprehensive loss resulting from other-than-temporary impairments of debt securities if a portion of an other-than-temporary impairment (OTTI) has not been recognized in earnings, attributable to the noncontrolling interest.
Object type: cm:Member
Data type: [Member] (nonnum:domainItemType)
Period type: For Period (duration)
Balance type: (no balance type)
Abstract: true
Workiva Wdesk Taxonomy Analyzer: us-gaap:AccumulatedOtherThanTemporaryImpairmentAttributableToNoncontrollingInterestMember

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Labels
Label Role Language
Accumulated Other-than-Temporary Impairment Attributable to Noncontrolling Interest [Member] http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 220 10 45 14A http://fasb.org/us-gaap/role/ref/legacyRef 220
FASB Accounting Standards Codification 220 10 45 10A (g) http://fasb.org/us-gaap/role/ref/legacyRef 220
FASB Accounting Standards Codification 320 10 45 9A http://fasb.org/us-gaap/role/ref/legacyRef 320
FASB Accounting Standards Codification 810 10 50 1A (c),(3) http://fasb.org/us-gaap/role/ref/legacyRef 810