cm:Level1TextBlock: us-gaap:MergersAcquisitionsAndDispositionsDisclosuresTextBlock
| Mergers, Acquisitions and Dispositions Disclosures [Text Block] |
| us-gaap:MergersAcquisitionsAndDispositionsDisclosuresTextBlock |
| The entire disclosure for business combinations, including leverage buyout transactions (as applicable), and divestitures. This may include a description of a business combination or divestiture (or series of individually immaterial business combinations or divestitures) completed during the period, including background, timing, and assets and liabilities recognized and reclassified or sold. This element does not include fixed asset sales and plant closings. |
| cm:Level1TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:MergersAcquisitionsAndDispositionsDisclosuresTextBlock |
| MergersAcquisitionsAndDispositionsDisclosures |