| Standard label: | Regulatory Liability, Current |
| Name: | us-gaap:RegulatoryLiabilityCurrent |
| Documentation: | The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:RegulatoryLiabilityCurrent |
| Label | Role | Language |
| Regulatory Liability, Current | http://www.xbrl.org/2003/role/label | en-US |
| Regulatory Liability, Current, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 980 405 25 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 980 |
| Part Of Roll Up: |
| us-gaap:LiabilitiesCurrent |