| Standard label: | Recorded Third-Party Environmental Recoveries, Description |
| Name: | us-gaap:RecordedThirdPartyEnvironmentalRecoveriesDescription |
| Documentation: | With respect to recognized assets for recoveries from third-parties pertaining to environmental remediation obligations, describes the nature of the recovery, the total amount recognized; for portions of the recovery discounted, the undiscounted amount of the recovery and the discount rate used in the present-value determinations; and, if applicable, an indication of whether it is at least reasonably possible that a change in the estimate of the asset will occur in the near term. May disclose the factors that cause the estimate to be sensitive to change. This element may be used for all disclosures related to third-party recoveries associated with environmental costs. |
| Object type: | cm:Concept |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:RecordedThirdPartyEnvironmentalRecoveriesDescription |
| Label | Role | Language |
| Recorded Third-Party Environmental Recoveries, Description | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 410 30 50 7 | http://fasb.org/us-gaap/role/ref/legacyRef | 410 |
| FASB Accounting Standards Codification 410 30 50 8 | http://fasb.org/us-gaap/role/ref/legacyRef | 410 |
| FASB Accounting Standards Codification 410 30 50 10 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 410 |
| FASB Accounting Standards Codification 410 30 50 12 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 410 |