cm:Table: us-gaap:ScheduleOfCapitalizationLongtermDebtTable
| Schedule of Capitalization, Long-term Debt [Table] |
| us-gaap:ScheduleOfCapitalizationLongtermDebtTable |
| Summarization of information required and determined to be disclosed concerning the long-term debt component of the capitalization of the entity. The table may be detailed by subsidiary (legal entity) and include information by type of debt detailed by instrument. |
| cm:Table |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:ScheduleOfCapitalizationLongtermDebtTable |