| Standard label: | Proceeds from (Payments for) Trading Securities, Short-term |
| Name: | us-gaap:ProceedsFromPaymentsForTradingSecurities |
| Documentation: | Amount of cash inflow (outflow) from sales and purchases of trading securities. |
| 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:ProceedsFromPaymentsForTradingSecurities |
| Label | Role | Language |
| Proceeds from (Payments for) Trading Securities, Short-term | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 9 (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 230 |
| FASB Accounting Standards Codification 230 10 45 12 (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 230 |
| FASB Accounting Standards Codification 230 10 45 13 (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 230 |