| Standard label: | Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |
| Name: | us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax |
| Documentation: | Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). |
| 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:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax |
| Label | Role | Language |
| Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | http://www.xbrl.org/2003/role/label | en-US |
| Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 220 10 45 14A | http://fasb.org/us-gaap/role/ref/legacyRef | 220 |
| FASB Accounting Standards Codification 220 10 45 10A (i-k) | http://fasb.org/us-gaap/role/ref/legacyRef | 220 |
| Part Of Roll Up: |
| us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax |