| Standard label: | Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, Year Four |
| Name: | us-gaap:PrescriptionDrugSubsidyReceiptsYearFour1 |
| Documentation: | Amount of prescription drug subsidy receipts expected in fourth fiscal year following latest fiscal year. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:PrescriptionDrugSubsidyReceiptsYearFour1 |
| Label | Role | Language |
| Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, Year Four | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 50 1 (f) | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |
| FASB Accounting Standards Codification 715 60 50 4 | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |