cm:Concept: us-gaap:LiquidationBasisOfAccountingAccruedCostsToDisposeOfAssetsAndLiabilities
| Liquidation Basis of Accounting, Accrued Costs to Dispose of Assets and Liabilities |
| us-gaap:LiquidationBasisOfAccountingAccruedCostsToDisposeOfAssetsAndLiabilities |
| Amount of estimated accrued costs to dispose of assets or other items expected to be sold in liquidation. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:LiquidationBasisOfAccountingAccruedCostsToDisposeOfAssetsAndLiabilities |