cm:Concept: us-gaap:DisposalGroupIncludingDiscontinuedOperationCash
| Disposal Group, Including Discontinued Operation, Cash |
| us-gaap:DisposalGroupIncludingDiscontinuedOperationCash |
| Amount of currency on hand, demand deposits with banks or financial institutions, and other kinds of accounts that have the general characteristics of demand deposits, held by a disposal group. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:DisposalGroupIncludingDiscontinuedOperationCash |