| Standard label: | Regulatory Assets, Fair Value Disclosure |
| Name: | us-gaap:RegulatoryAssetsNoncurrentFairValueDisclosure |
| Documentation: | Fair value portion of capitalized costs of regulated entities that are not expected to be recovered through revenue sources. |
| 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:RegulatoryAssetsNoncurrentFairValueDisclosure |
| Label | Role | Language |
| Regulatory Assets, Fair Value Disclosure | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 820 10 50 2 (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 820 |
| Part Of Roll Up: |
| us-gaap:AssetsFairValueDisclosure |