cm:Level3TextBlock: us-gaap:ScheduleOfFinancingReceivablesMinimumPaymentsTableTextBlock
| Schedule of Financing Receivables, Minimum Payments [Table Text Block] |
| us-gaap:ScheduleOfFinancingReceivablesMinimumPaymentsTableTextBlock |
| Tabular disclosure of the annual minimum payments due from financing receivables, such as, but not limited to accounts, notes, loans, and other financing receivables. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ScheduleOfFinancingReceivablesMinimumPaymentsTableTextBlock |
| FinancingReceivablesMinimumPayments |