| Standard label: | Defined Benefit Plan, Government's Rights to Plan Assets in Event of Plan Termination, Amount |
| Name: | us-gaap:DefinedBenefitPlanGovernmentsRightsToPlanAssetsInEventOfPlanTerminationAmount |
| Documentation: | Amount of excess plan assets subject to government rights in event of plan termination. |
| 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:DefinedBenefitPlanGovernmentsRightsToPlanAssetsInEventOfPlanTerminationAmount |
| Label | Role | Language |
| Defined Benefit Plan, Government's Rights to Plan Assets in Event of Plan Termination, Amount | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 912 715 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 912 |