| Standard label: | Commodities Investment [Member] |
| Name: | us-gaap:CommoditiesInvestmentMember |
| Documentation: | Investments held in a physical substance, such as food, grains, and metals, which is interchangeable with another product of the same type, and which investors buy or sell, usually through futures contracts. |
| 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:CommoditiesInvestmentMember |
| Label | Role | Language |
| Commodities Investment [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |