| Standard label: | Deferred Fuel Cost |
| Name: | us-gaap:DeferredFuelCost |
| Documentation: | Carrying amount as of the balance sheet date of capitalized fuel costs of a regulated entity that are expected to be recoverable through rate adjustments within one year or the normal operating cycle, if longer. |
| 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:DeferredFuelCost |
| Label | Role | Language |
| Deferred Fuel Cost | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 980 340 25 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 980 |
| Part Of Roll Up: |
| us-gaap:DeferredCostsCurrent |