| Standard label: | Other Postretirement Benefits Expense (Reversal of Expense), Noncash |
| Name: | us-gaap:OtherPostretirementBenefitsExpenseReversalOfExpenseNoncash |
| Documentation: | Amount of noncash expense (reversal of expense) 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:OtherPostretirementBenefitsExpenseReversalOfExpenseNoncash |
| Label | Role | Language |
| Other Postretirement Benefits Expense (Reversal of Expense), Noncash | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 28 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 230 |
| Part Of Roll Up: |
| us-gaap:PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash |