| Standard label: | Public Utilities, Property, Plant and Equipment, Plant Acquisition Adjustments for Intangible Utility Plants | 
| Name: | us-gaap:PublicUtilitiesPropertyPlantAndEquipmentPlantAcquisitionAdjustmentsForIntangibleUtilityPlants | 
| Documentation: | Any changes made to the acquisition costs of intangible utility plants. | 
| 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:PublicUtilitiesPropertyPlantAndEquipmentPlantAcquisitionAdjustmentsForIntangibleUtilityPlants | 
| Label | Role | Language | 
| Public Utilities, Property, Plant and Equipment, Plant Acquisition Adjustments for Intangible Utility Plants | 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 |