cm:Concept: us-gaap:LiabilitiesOfBusinessTransferredUnderContractualArrangementCurrent
| Liabilities of Business Transferred under Contractual Arrangement, Current |
| us-gaap:LiabilitiesOfBusinessTransferredUnderContractualArrangementCurrent |
| The current carrying amount, due within one year or one operating cycle, if longer, of liabilities resulting from the transfer of a business segment under contractual arrangement where the transferor maintains certain risks, obligations or liabilities. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:LiabilitiesOfBusinessTransferredUnderContractualArrangementCurrent |