cm:Concept: us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
| Income (Loss) from Continuing Operations before Income Taxes, Foreign |
| us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign |
| The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign |