| Standard label: | Regulatory Assets, Noncurrent |
| Name: | us-gaap:RegulatoryAssetsNoncurrent |
| Documentation: | Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:RegulatoryAssetsNoncurrent |
| Label | Role | Language |
| Regulatory Assets, Noncurrent | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 980 340 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 980 |
| Part Of Roll Up: |
| us-gaap:RegulatedEntityOtherAssetsNoncurrent |