| Standard label: | SEC Schedule, 12-09, Reserve, Environmental Cost [Member] |
| Name: | us-gaap:ReserveForEnvironmentalCostsMember |
| Documentation: | Reserve for expected cost from environmental loss contingency. |
| 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:ReserveForEnvironmentalCostsMember |
| Label | Role | Language |
| SEC Schedule, 12-09, Reserve, Environmental Cost [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 235 10 S99 4 (SX 210.12-09(ColumnA)) | http://www.xbrl.org/2009/role/commonPracticeRef | 235 |