cm:Concept: us-gaap:NoncontrollingInterestInVariableInterestEntity
| Noncontrolling Interest in Variable Interest Entity |
| us-gaap:NoncontrollingInterestInVariableInterestEntity |
| Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest). |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:NoncontrollingInterestInVariableInterestEntity |