| Name | LongTermContractsForPurchaseOfElectricPowerTable |
|---|---|
| Namespace | http://fasb.org/us-gaap/2020-01-31 |
| Prefix | us-gaap |
| Data type | xbrli:stringItemType |
| Period type | duration |
| Substitution Group | xbrldt:hypercubeItem |
| Balance | None |
| Nillable | True |
| Abstract | True |
| Text | Lang | Role | Container role |
|---|---|---|---|
| Long-term Contracts for Purchase of Electric Power [Table] | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Presents detailed element information concerning the terms and significance of long term contracts to purchase power. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Name | Value | Role |
|---|---|---|
| SourceName | Reference Project:Taxonomy Technical Improvement | http://fasb.org/srt/role/changeNote/changeNote |
| TaxonomyVersion | 2020 | http://fasb.org/srt/role/changeNote/changeNote |
| ChangeDate | 2019-11 | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedReferences | true | http://fasb.org/srt/role/changeNote/changeNote |
| Publisher | FASB | http://fasb.org/us-gaap/role/ref/legacyRef |
| Name | Accounting Standards Codification | http://fasb.org/us-gaap/role/ref/legacyRef |
| Topic | 980 | http://fasb.org/us-gaap/role/ref/legacyRef |
| SubTopic | 10 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Section | S99 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Paragraph | 1 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Subparagraph | (SAB Topic 10.D) | http://fasb.org/us-gaap/role/ref/legacyRef |
| URI | http://asc.fasb.org/extlink&oid=6499423&loc=d3e659339-123030 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Name | Relation Type | Role | |
|---|---|---|---|
us-gaap:LongTermContractForPurchaseOfElectricPowerAxis | parent-child | http://fasb.org/us-gaap/role/disclosure/RegulatedOperations | |
us-gaap:LongTermContractForPurchaseOfElectricPowerLineItems | parent-child | http://fasb.org/us-gaap/role/disclosure/RegulatedOperations | |
us-gaap:LongTermContractForPurchaseOfElectricPowerAxis | hypercube-dimension | http://fasb.org/us-gaap/role/disclosure/RegulatedOperationsLongTermContractsForPurchaseOfElectricPowerTable |
| Name | Relation Type | Role | |
|---|---|---|---|
us-gaap:ScheduleOfLongTermContractsForPurchaseOfElectricPowerTextBlock | parent-child | http://fasb.org/us-gaap/role/disclosure/RegulatedOperations | |
us-gaap:LongTermContractForPurchaseOfElectricPowerLineItems | all | http://fasb.org/us-gaap/role/disclosure/RegulatedOperationsLongTermContractsForPurchaseOfElectricPowerTable |