cm:Concept: us-gaap:DeconsolidationRelatedPartyDescription
| Deconsolidation, Related Party, Description |
| us-gaap:DeconsolidationRelatedPartyDescription |
| Description of related party involvement in transaction resulting in deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of product or service in contract with customer; and whether former subsidiary or acquirer of group of assets would be related party after deconsolidation and derecognition transaction. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:DeconsolidationRelatedPartyDescription |