| Standard label: | Comprehensive Income (Loss) Note [Text Block] |
| Name: | us-gaap:ComprehensiveIncomeNoteTextBlock |
| Documentation: | The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. |
| 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:ComprehensiveIncomeNoteTextBlock |
| Examples of this text block disclosure: | ComprehensiveIncomeLossNote |
| Label | Role | Language |
| Comprehensive Income (Loss) Note [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 220 | http://fasb.org/us-gaap/role/ref/legacyRef | 220 |