| Standard label: | Plant Held for Future Use Amount |
| Name: | us-gaap:PlantHeldForFutureUseAmount |
| Documentation: | Discloses the period end amount of plants held for future use and whether such amount is included in the utility's rate base. |
| 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:PlantHeldForFutureUseAmount |
| Label | Role | Language |
| Plant Held for Future Use Amount | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (SX 210.5-02.13(b)) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |