cm:Concept: us-gaap:DebtorReorganizationItemsWriteOffOfDeferredFinancingCostsAndDebtDiscounts
| Debtor Reorganization Items, Write-off of Debt Issuance Costs and Debt Discounts |
| us-gaap:DebtorReorganizationItemsWriteOffOfDeferredFinancingCostsAndDebtDiscounts |
| Amount of write-off of debt issuance costs and debt discounts related to prepetition debt obligations. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Debit |
| false |
| us-gaap:DebtorReorganizationItemsWriteOffOfDeferredFinancingCostsAndDebtDiscounts |