cm:Concept: us-gaap:VariableInterestEntityNumberOfEntitiesWithUnavailabilityOfInformation
| Variable Interest Entity, Unavailability of Information, Number of Entities |
| us-gaap:VariableInterestEntityNumberOfEntitiesWithUnavailabilityOfInformation |
| Number of Variable Interest Entities (VIE) or potential VIEs for which the necessary information is unable to be obtained to: (1) determine whether the legal entity is a VIE, (2) determine whether it (the reporting entity) is the VIE's primary beneficiary, or (3) perform the accounting required to consolidate the VIE for which it is determined that it (the reporting entity) is the primary beneficiary. |
| cm:Concept |
| Integer (xbrli:integerItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:VariableInterestEntityNumberOfEntitiesWithUnavailabilityOfInformation |