cm:Concept: us-gaap:DebtInstrumentFairValueByFairValueHierarchyLevelExtensibleList
| Debt Instrument, Fair Value by Fair Value Hierarchy Level [Extensible List] |
| us-gaap:DebtInstrumentFairValueByFairValueHierarchyLevelExtensibleList |
| Indicates level within fair value hierarchy of debt instrument, including, but not limited to, convertible and non-convertible debt. |
| cm:Concept |
| srt-types:extensibleListItemType |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:DebtInstrumentFairValueByFairValueHierarchyLevelExtensibleList |