| Standard label: | Derivative, Average Forward Price |
| Name: | us-gaap:DerivativeAverageForwardPrice |
| Documentation: | The average forward price on the group of price risk forward or futures contracts, such as gas futures contracts. |
| Object type: | cm:Concept |
| Data type: | srt-types:perUnitItemType |
| Period type: | As Of (instant) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:DerivativeAverageForwardPrice |
| Label | Role | Language |
| Derivative, Average Forward Price | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |