cm:Concept: us-gaap:LiabilitiesSubjectToCompromiseCapitalLeaseObligationsAndAccruedInterest
| Liabilities Subject to Compromise, Capital Lease Obligations and Accrued Interest |
| us-gaap:LiabilitiesSubjectToCompromiseCapitalLeaseObligationsAndAccruedInterest |
| The amount of capital lease obligations and related accrued interest included in liabilities subject to compromise. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:LiabilitiesSubjectToCompromiseCapitalLeaseObligationsAndAccruedInterest |