IndexInvestment Company, Financial Highlights [Text Block]
| Name | InvestmentCompanyFinancialHighlightsTextBlock |
|---|---|
| Namespace | http://fasb.org/us-gaap/2021-01-31 |
| Prefix | us-gaap |
| Data type | dtr-types:textBlockItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | None |
| Nillable | True |
| Abstract | False |
Labels
| Text | Lang | Role | Container role |
|---|---|---|---|
| Investment Company, Financial Highlights [Text Block] | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
Related Child Concepts
| Name | Relation Type | Role | |
|---|---|---|---|
 | us-gaap:InvestmentCompanyFinancialHighlightsTableTextBlock | parent-child | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompany |
Related Parent Concepts
| Name | Relation Type | Role | |
|---|---|---|---|
| us-gaap:DisclosureTextBlockAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/ComprehensiveTextBlockList |
| us-gaap:InvestmentCompanyFinancialHighlightsAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompany |