| Standard label: | Other Postretirement Benefits Cost (Reversal of Cost) |
| Name: | us-gaap:OtherPostretirementBenefitExpense |
| Documentation: | Amount of cost (reversal of cost) for other postretirement benefits. Excludes pension benefits. |
| 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:OtherPostretirementBenefitExpense |
| Label | Role | Language |
| Other Postretirement Benefits Cost (Reversal of Cost) | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| Part Of Roll Up: |
| us-gaap:PensionAndOtherPostretirementBenefitExpense |