| Standard label: | Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage |
| Name: | us-gaap:DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryPercentage |
| Documentation: | Percentage of investment to total investment within defined benefit plan asset category. |
| Object type: | cm:Concept |
| Data type: | Percent (num:percentItemType) |
| Period type: | As Of (instant) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryPercentage |
| Label | Role | Language |
| Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 50 1 (d)(i) | http://www.xbrl.org/2009/role/commonPracticeRef | 715 |
| FASB Accounting Standards Codification 715 20 55 17 | http://www.xbrl.org/2003/role/exampleRef | 715 |