cm:Concept: us-gaap:PostconfirmationReorganizationValueInExcessOfAmountsAllocableToIdentifiableAssets
| Postconfirmation, Reorganization Value in Excess of Amounts Allocable to Identifiable Assets |
| us-gaap:PostconfirmationReorganizationValueInExcessOfAmountsAllocableToIdentifiableAssets |
| Amount of reorganization value in excess of amounts allocable to identifiable assets at the balance sheet date after fresh-start adjustments. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:PostconfirmationReorganizationValueInExcessOfAmountsAllocableToIdentifiableAssets |