| Standard label: | Business Description and Basis of Presentation [Text Block] |
| Name: | us-gaap:BusinessDescriptionAndBasisOfPresentationTextBlock |
| Documentation: | The entire disclosure for the business description and basis of presentation concepts. Business description describes the nature and type of organization including but not limited to organizational structure as may be applicable to holding companies, parent and subsidiary relationships, business divisions, business units, business segments, affiliates and information about significant ownership of the reporting entity. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). |
| Object type: | cm:Level1TextBlock |
| 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:BusinessDescriptionAndBasisOfPresentationTextBlock |
| Examples of this text block disclosure: | BusinessDescriptionAndBasisOfPresentationDisclosure |
| Label | Role | Language |
| Business Description and Basis of Presentation [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 205 | http://fasb.org/us-gaap/role/ref/legacyRef | 205 |
| FASB Accounting Standards Codification 235 | http://fasb.org/us-gaap/role/ref/legacyRef | 235 |
| FASB Accounting Standards Codification 275 | http://fasb.org/us-gaap/role/ref/legacyRef | 275 |