| Standard label: | Accretion Expense, Including Asset Retirement Obligations |
| Name: | us-gaap:AccretionExpenseIncludingAssetRetirementObligations |
| Documentation: | Amount of accretion expense, which includes, but is not limited to, accretion expense from asset retirement obligations, environmental remediation obligations, and other contingencies. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AccretionExpenseIncludingAssetRetirementObligations |
| Label | Role | Language |
| Accretion Expense, Including Asset Retirement Obligations | http://www.xbrl.org/2003/role/label | en-US |
| Accretion Expense, Including Asset Retirement Obligations, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| Part Of Roll Up: |
| us-gaap:OperatingCostsAndExpenses |
| us-gaap:AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities |