| Standard label: | Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Table] |
| Name: | us-gaap:DefinedBenefitPlanPlanAssetsLevel3ReconciliationTable |
| Documentation: | Disclosure of information about defined benefit plan assets measured using unobservable inputs. |
| Object type: | cm:Table |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:DefinedBenefitPlanPlanAssetsLevel3ReconciliationTable |
| Label | Role | Language |
| Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Table] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 50 1 (d)(iv)(02) | http://www.xbrl.org/2009/role/commonPracticeRef | 715 |