| Standard label: | Cost, Trust Asset Sold to Pay Expense |
| Name: | us-gaap:CostOfTrustAssetsSoldToPayExpenses |
| Documentation: | Cost of trust assets sold to pay trust expenses (includes commodities, but is not limited to, gold and silver). |
| 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:CostOfTrustAssetsSoldToPayExpenses |
| Label | Role | Language |
| Cost, Trust Asset Sold to Pay Expense | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| Part Of Roll Up: |
| us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization |