| Standard label: | Change in Assumptions for Defined Benefit Plans [Member] |
| Name: | us-gaap:ChangeInAssumptionsForPensionPlansMember |
| Documentation: | Revision in assumptions used in calculating benefit obligation and cost associated with defined benefit plan. Includes, but is not limited to, change in mortality assumption and discount rate. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ChangeInAssumptionsForPensionPlansMember |
| Label | Role | Language |
| Change in Assumptions for Defined Benefit Plans [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |