cm:Level3TextBlock: us-gaap:ScheduleOfCapitalizationTextBlock
| Schedule of Capitalization [Table Text Block] |
| us-gaap:ScheduleOfCapitalizationTextBlock |
| Tabular disclosure of the capitalization of the entity comprised of its long-term debt and equity instruments. The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by instrument. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ScheduleOfCapitalizationTextBlock |