| Standard label: | Investments in and Advances to Affiliates, Dividend or Interest, Other |
| Name: | us-gaap:InvestmentsInAndAdvancesToAffiliatesDividendOrInterestOther |
| Documentation: | All other dividends and interest. Explain in the "Schedule of Investments, Investment Notes" the treatment accorded each item. |
| 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:InvestmentsInAndAdvancesToAffiliatesDividendOrInterestOther |
| Label | Role | Language |
| Investments in and Advances to Affiliates, Dividend or Interest, Other | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 946 320 S99 6 (SX 210.12-14(5)(b)) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |
| FASB Accounting Standards Codification 946 320 S99 6 (SX 210.12-14(Column D)(Column 2)) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |