IndexInvestments in and Advances to Affiliates, at Fair Value
| Name | InvestmentsInAndAdvancesToAffiliatesAtFairValue |
|---|---|
| Namespace | http://fasb.org/us-gaap/2020-01-31 |
| Prefix | us-gaap |
| Data type | xbrli:monetaryItemType |
| Period type | instant |
| Substitution Group | xbrli:item |
| Balance | debit |
| Nillable | True |
| Abstract | False |
Labels
| Text | Lang | Role | Container role |
|---|---|---|---|
| Investments in and Advances to Affiliates, at Fair Value | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Investments in and Advances to Affiliates, at Fair Value, Beginning Balance | en-US | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Investments in and Advances to Affiliates, at Fair Value, Ending Balance | en-US | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |
Related Parent Concepts
| Name | Relation Type | Role | |
|---|---|---|---|
 | us-gaap:InvestmentsInAndAdvancesToAffiliatesAtFairValueRollForward | parent-child | http://fasb.org/us-gaap/role/disclosure/InvestmentsInAndAdvancesToAffiliates |
| us-gaap:InvestmentsInAndAdvancesToAffiliatesAtFairValueRollForward | parent-child | http://fasb.org/us-gaap/role/disclosure/InvestmentsInAndAdvancesToAffiliates |
| us-gaap:InvestmentsInAndAdvancesToAffiliatesAtFairValueRollForward | domain-member | http://fasb.org/us-gaap/role/disclosure/InvestmentsInAndAdvancesToAffiliates |
| us-gaap:InvestmentsInAndAdvancesToAffiliatesAtFairValueRollForward | domain-member | http://fasb.org/us-gaap/role/disclosure/InvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTable |