| Standard label: | Defined Benefit Plan, Prescription Drug Benefit, Net Periodic Postretirement Benefit Cost, (Increase) Decrease for Subsidy |
| Name: | us-gaap:PrescriptionDrugBenefitEffectOfSubsidyOnNetPeriodicPostretirementBenefitCost1 |
| Documentation: | Amount of (increase) decrease in net periodic benefit cost from government subsidy for prescription drug benefits. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:PrescriptionDrugBenefitEffectOfSubsidyOnNetPeriodicPostretirementBenefitCost1 |
| Label | Role | Language |
| Defined Benefit Plan, Prescription Drug Benefit, Net Periodic Postretirement Benefit Cost, (Increase) Decrease for Subsidy | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 60 50 3 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |