| Standard label: | Clearing Service [Member] |
| Name: | us-gaap:ClearingServiceMember |
| Documentation: | Matching of all buy and sell orders to reconcile transactions, ensure delivery of order and record transfer of funds. Includes, but is not limited to, delivery and creation of futures position from option exercise or assignment, Exchange for Physicals (EFP), block trades and transfer trades. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ClearingServiceMember |
| Label | Role | Language |
| Clearing Service [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 606 10 55 91 (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 606 |