| Standard label: | Allowance for Funds Used During Construction, Investing Activities |
| Name: | us-gaap:AllowanceForFundsUsedDuringConstructionInvestingActivities |
| Documentation: | Cash inflow due to change during the period in the allowance for other funds used during construction classified as an investing activity. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AllowanceForFundsUsedDuringConstructionInvestingActivities |
| Label | Role | Language |
| Allowance for Funds Used During Construction, Investing Activities | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 12 | http://fasb.org/us-gaap/role/ref/legacyRef | 230 |
| FASB Accounting Standards Codification 980 360 25 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 980 |
| Part Of Roll Up: |
| us-gaap:NetCashProvidedByUsedInInvestingActivitiesContinuingOperations |