cm:Concept: us-gaap:ProceedsFromIssuanceOfFirstMortgageBond
| Proceeds from Issuance of First Mortgage Bond |
| us-gaap:ProceedsFromIssuanceOfFirstMortgageBond |
| The cash inflow from amounts received from a long-term debt instrument secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Debit |
| false |
| us-gaap:ProceedsFromIssuanceOfFirstMortgageBond |