| Standard label: | Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component |
| Name: | us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent |
| Documentation: | Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination 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:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent |
| Label | Role | Language |
| Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 45 3A (b) | http://www.xbrl.org/2003/role/disclosureRef | 715 |
| Part Of Roll Up: |
| us-gaap:NonoperatingIncomeExpense |
| us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost |