| Standard label: | Accrual for Environmental Loss Contingencies |
| Name: | us-gaap:AccrualForEnvironmentalLossContingencies |
| Documentation: | Total costs accrued as of the balance sheet date for environmental loss contingencies. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AccrualForEnvironmentalLossContingencies |
| Label | Role | Language |
| Accrual for Environmental Loss Contingencies | http://www.xbrl.org/2003/role/label | en-US |
| Accrual for Environmental Loss Contingencies, Ending Balance | http://www.xbrl.org/2003/role/periodEndLabel | en-US |
| Accrual for Environmental Loss Contingencies, Beginning Balance | http://www.xbrl.org/2003/role/periodStartLabel | en-US |
| Accrual for Environmental Loss Contingencies, Total | http://www.xbrl.org/2003/role/totalLabel | 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 450 20 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |
| FASB Accounting Standards Codification 450 20 25 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |