cm:Concept: us-gaap:EntityNotSubjectToIncomeTaxesPolicy
| Entity Not Subject to Income Taxes, Policy |
| us-gaap:EntityNotSubjectToIncomeTaxesPolicy |
| An enterprise that is not subject to income taxes because its income is taxed directly to its owners may disclose that fact and the net difference between the tax bases and the reported amounts of the enterprise's assets and liabilities. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:EntityNotSubjectToIncomeTaxesPolicy |