| Standard label: | Customer Advances for Construction |
| Name: | us-gaap:CustomerAdvancesForConstruction |
| Documentation: | For utilities only, represents the carrying amount of the liability as of the balance sheet date for payments received by a utility from its customers in advance of performing its obligations under terms of its construction agreements. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:CustomerAdvancesForConstruction |
| Label | Role | Language |
| Customer Advances for Construction | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (SX 210.5-02.24) | http://fasb.org/us-gaap/role/ref/otherTransitionRef | 210 |