| Standard label: | Foreign Currency Disclosure [Text Block] |
| Name: | us-gaap:ForeignCurrencyDisclosureTextBlock |
| Documentation: | The entire disclosure for foreign currency transactions and translation. This may include description of foreign currency transactions, foreign currency gains and losses, explanation of change in cumulative translation adjustment, description of effect of subsequent foreign currency exchange rate change, cumulative translation adjustment movement, foreign currency translation adjustment by component movement, translation adjustment for net investment hedge movement, adjustment for long-term intercompany transactions, schedule of long-term intercompany balances and any other foreign currency transactions and translation related items. |
| 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:ForeignCurrencyDisclosureTextBlock |
| Examples of this text block disclosure: | ForeignCurrencyTransactionDisclosure |
| Label | Role | Language |
| Foreign Currency Disclosure [Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 830 | http://fasb.org/us-gaap/role/ref/legacyRef | 830 |