IndexOpen Option Contracts Written, Schedule of Investments [Table Text Block]
| Name | OpenOptionContractsWrittenScheduleOfInvestmentsTextBlock |
|---|---|
| Namespace | http://fasb.org/us-gaap/2020-01-31 |
| Prefix | us-gaap |
| Data type | nonnum:textBlockItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | None |
| Nillable | True |
| Abstract | False |
Labels
| Text | Lang | Role | Container role |
|---|---|---|---|
| Open Option Contracts Written, Schedule of Investments [Table Text Block] | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Tabular disclosure of the information required in the supplementary schedule applicable to management investment companies listing written option contracts. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
References
| Name | Value | Role |
|---|---|---|
| SourceName | SEC Simplification | http://fasb.org/srt/role/changeNote/changeNote |
| TaxonomyVersion | 2020 | http://fasb.org/srt/role/changeNote/changeNote |
| ChangeDate | 2019-10 | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedReferences | true | http://fasb.org/srt/role/changeNote/changeNote |
| Source_ASU_Number | 2019-07 | http://fasb.org/srt/role/changeNote/changeNote |
| Publisher | FASB | http://www.xbrl.org/2009/role/commonPracticeRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2009/role/commonPracticeRef |
| Topic | 946 | http://www.xbrl.org/2009/role/commonPracticeRef |
| SubTopic | 320 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Section | S99 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Paragraph | 5 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Subparagraph | (SX 210.12-13) | http://www.xbrl.org/2009/role/commonPracticeRef |
| URI | http://asc.fasb.org/extlink&oid=120401592&loc=d3e611282-123010 | http://www.xbrl.org/2009/role/commonPracticeRef |
Related Child Concepts
| Name | Relation Type | Role | |
|---|---|---|---|
 | us-gaap:OpenOptionContractsWrittenTable | parent-child | http://fasb.org/us-gaap/role/disclosure/OpenOptionContractsWritten |
Related Parent Concepts
| Name | Relation Type | Role | |
|---|---|---|---|
| us-gaap:ScheduleOfInvestmentsAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/OpenOptionContractsWritten |
| us-gaap:TableTextBlock | parent-child | http://fasb.org/us-gaap/role/disclosure/ComprehensiveTextBlockList |