| Standard label: | Jointly Owned Utility Plant, Proportionate Ownership Share |
| Name: | us-gaap:JointlyOwnedUtilityPlantProportionateOwnershipShare |
| Documentation: | The proportionate share of interest (percent) in a jointly owned utility plant. |
| Object type: | cm:Concept |
| Data type: | Percent (num:percentItemType) |
| Period type: | As Of (instant) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:JointlyOwnedUtilityPlantProportionateOwnershipShare |
| Label | Role | Language |
| Jointly Owned Utility Plant, Proportionate Ownership Share | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 980 360 S99 1 (SAB Topic 10.C) | http://fasb.org/us-gaap/role/ref/legacyRef | 980 |