| Standard label: | Intermediate-life Plants, Useful Life |
| Name: | us-gaap:IntermediateLifePlantsUsefulLife |
| Documentation: | Useful life of intermediate-life plants, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. |
| Object type: | cm:Concept |
| Data type: | xbrli:durationItemType |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:IntermediateLifePlantsUsefulLife |
| Label | Role | Language |
| Intermediate-life Plants, Useful Life | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 905 360 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 905 |