| Standard label: | Unsecured Debt |
| Name: | us-gaap:UnsecuredDebt |
| Documentation: | Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:UnsecuredDebt |
| Label | Role | Language |
| Unsecured Debt | http://www.xbrl.org/2003/role/label | en-US |
| Unsecured Debt, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (SX 210.5-02(22)) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03(16)) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |
| FASB Accounting Standards Codification 944 210 S99 1 (SX 210.7-03(a)(16)) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |