| Standard label: | Defined Benefit Plan, Funded (Unfunded) Status of Plan |
| Name: | us-gaap:DefinedBenefitPlanFundedStatusOfPlan |
| Documentation: | Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. |
| 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:DefinedBenefitPlanFundedStatusOfPlan |
| Label | Role | Language |
| Defined Benefit Plan, Funded (Unfunded) Status of Plan | http://www.xbrl.org/2003/role/label | en-US |
| Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 50 1 (c) | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |
| FASB Accounting Standards Codification 715 20 45 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |