| Standard label: | Defined Benefit Plan, Plan Assets, Benefits Paid |
| Name: | us-gaap:DefinedBenefitPlanPlanAssetsBenefitsPaid |
| Documentation: | Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:DefinedBenefitPlanPlanAssetsBenefitsPaid |
| Label | Role | Language |
| Defined Benefit Plan, Plan Assets, Benefits Paid | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 50 1 (b)(5) | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |
| FASB Accounting Standards Codification 715 60 50 4 | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |
| Part Of Roll Up: |
| us-gaap:DefinedBenefitPlanFairValueOfPlanAssetsPeriodIncreaseDecrease |