cm:Concept: us-gaap:DiscontinuanceOfCertainRegulatoryReportingPractices
| Discontinuance of Certain Regulatory Reporting Practices |
| us-gaap:DiscontinuanceOfCertainRegulatoryReportingPractices |
| Describes the entity's reasons for its discontinuation of accounting for the effects of certain types of regulation (primarily costs pertaining to ate-setting) and identifies the portion of its operations to which such application was discontinued. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:DiscontinuanceOfCertainRegulatoryReportingPractices |