cm:Concept: us-gaap:SalesTypeAndDirectFinancingLeasesLeaseReceivable
| Sales-type and Direct Financing Leases, Lease Receivable |
| us-gaap:SalesTypeAndDirectFinancingLeasesLeaseReceivable |
| Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type and direct financing leases. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:SalesTypeAndDirectFinancingLeasesLeaseReceivable |