IndexFuel [Member]
| Name | FuelMember |
|---|---|
| Namespace | http://fasb.org/srt/2020-01-31 |
| Prefix | srt |
| Data type | nonnum:domainItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | None |
| Nillable | True |
| Abstract | True |
Labels
| Text | Lang | Role | Container role |
|---|---|---|---|
| Fuel [Member] | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Material used for production of energy in form of heat or power. Includes, but is not limited to, coal, gas, and oil. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
References
| Name | Value | Role |
|---|---|---|
| TaxonomyVersion | 2019 | http://fasb.org/srt/role/changeNote/changeNote |
| ChangeDate | 2018-10 | http://fasb.org/srt/role/changeNote/changeNote |
| NewElement | true | http://fasb.org/srt/role/changeNote/changeNote |
| Publisher | SEC | http://www.xbrl.org/2009/role/commonPracticeRef |
| Name | Regulation S-K (SK) | http://www.xbrl.org/2009/role/commonPracticeRef |
| Number | 229 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Section | 1204 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Paragraph | (b) | http://www.xbrl.org/2009/role/commonPracticeRef |
| Subparagraph | (2) | http://www.xbrl.org/2009/role/commonPracticeRef |
| Publisher | SEC | http://www.xbrl.org/2009/role/commonPracticeRef |
| Name | Regulation S-K (SK) | http://www.xbrl.org/2009/role/commonPracticeRef |
| Number | 229 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Section | 1204 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Paragraph | (b) | http://www.xbrl.org/2009/role/commonPracticeRef |
| Subparagraph | (1) | http://www.xbrl.org/2009/role/commonPracticeRef |
Related Parent Concepts
| Name | Relation Type | Role | |
|---|---|---|---|
 | srt:EnergyDomain | parent-child | http://fasb.org/srt/role/statement/CommonDomainMembers |
| srt:EnergyDomain | domain-member | http://fasb.org/srt/role/statement/CommonDomainMembersCommonTable |
| srt:EnergyDomain | parent-child | http://fasb.org/srt/role/disclosure/ExtractiveIndustries |
| srt:EnergyDomain | domain-member | http://fasb.org/srt/role/disclosure/ExtractiveIndustriesAverageSalesPriceAndProductionCostsPerUnitOfProductionTable |