| Standard label: | Investments in Power and Distribution Projects |
| Name: | us-gaap:InvestmentsInPowerAndDistributionProjects |
| Documentation: | Carrying amount as of the balance sheet date of investments in power and distribution projects that are expected to be realized after one year or beyond the 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:InvestmentsInPowerAndDistributionProjects |
| Label | Role | Language |
| Investments in Power and Distribution Projects | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (SX 210.5-02.12) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| Part Of Roll Up: |
| us-gaap:RegulatedEntityOtherAssetsNoncurrent |