| Standard label: | Restructuring and Related Activities Disclosure [Text Block] |
| Name: | us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock |
| Documentation: | The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled. |
| 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:RestructuringAndRelatedActivitiesDisclosureTextBlock |
| Examples of this text block disclosure: | RestructuringAndRelatedActivitiesDisclosure |
| Label | Role | Language |
| Restructuring and Related Activities Disclosure [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 420 | http://fasb.org/us-gaap/role/ref/legacyRef | 420 |