| Standard label: | Proceeds from Issuance of Unsecured Tax Exempt Debt |
| Name: | us-gaap:ProceedsFromIssuanceOfUnsecuredTaxExemptDebt |
| Documentation: | The cash inflow from the issuance of long-term tax exempt debt that is not secured by collateral. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ProceedsFromIssuanceOfUnsecuredTaxExemptDebt |
| Label | Role | Language |
| Proceeds from Issuance of Unsecured Tax Exempt Debt | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 14 (b) | http://www.xbrl.org/2009/role/commonPracticeRef | 230 |
| Part Of Roll Up: |
| us-gaap:ProceedsFromIssuanceOfLongTermDebt |