| Standard label: | Natural Gas, Gathering, Transportation, Marketing and Processing [Member] |
| Name: | us-gaap:NaturalGasGatheringTransportationMarketingAndProcessingMember |
| Documentation: | Process related to midstream and downstream activity for flammable gas occurring naturally underground. Activity includes, but is not limited to, refining, marketing, gathering from well, processing to remove impurity, storage, transmission, and sale of natural gas and related products. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:NaturalGasGatheringTransportationMarketingAndProcessingMember |
| Label | Role | Language |
| Natural Gas, Gathering, Transportation, Marketing and Processing [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 606 10 55 91 (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 606 |