| Name | JointlyOwnedUtilityPlantNetOwnershipAmountAbstract |
|---|---|
| Namespace | http://fasb.org/us-gaap/2021-01-31 |
| Prefix | us-gaap |
| Data type | xbrli:stringItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | None |
| Nillable | True |
| Abstract | True |
| Text | Lang | Role | Container role |
|---|---|---|---|
| Jointly Owned Utility Plant, Net Ownership Amount [Abstract] | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Name | Value | Role |
|---|---|---|
| elementCreationTaxonomyVersion | 2008 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Name | Relation Type | Role | |
|---|---|---|---|
us-gaap:JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService | parent-child | http://fasb.org/us-gaap/role/disclosure/RegulatedOperations | |
us-gaap:JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation | parent-child | http://fasb.org/us-gaap/role/disclosure/RegulatedOperations | |
us-gaap:JointlyOwnedUtilityPlantOwnershipAmountOfOtherAssets | parent-child | http://fasb.org/us-gaap/role/disclosure/RegulatedOperations | |
us-gaap:JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress | parent-child | http://fasb.org/us-gaap/role/disclosure/RegulatedOperations | |
us-gaap:JointlyOwnedUtilityPlantNetOwnershipAmount | parent-child | http://fasb.org/us-gaap/role/disclosure/RegulatedOperations | |
us-gaap:JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService | domain-member | http://fasb.org/us-gaap/role/disclosure/RegulatedOperationsJointlyOwnedUtilityPlantInterestsTable | |
us-gaap:JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation | domain-member | http://fasb.org/us-gaap/role/disclosure/RegulatedOperationsJointlyOwnedUtilityPlantInterestsTable | |
us-gaap:JointlyOwnedUtilityPlantOwnershipAmountOfOtherAssets | domain-member | http://fasb.org/us-gaap/role/disclosure/RegulatedOperationsJointlyOwnedUtilityPlantInterestsTable | |
us-gaap:JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress | domain-member | http://fasb.org/us-gaap/role/disclosure/RegulatedOperationsJointlyOwnedUtilityPlantInterestsTable | |
us-gaap:JointlyOwnedUtilityPlantNetOwnershipAmount | domain-member | http://fasb.org/us-gaap/role/disclosure/RegulatedOperationsJointlyOwnedUtilityPlantInterestsTable |
| Name | Relation Type | Role | |
|---|---|---|---|
us-gaap:JointlyOwnedUtilityPlantInterestsLineItems | parent-child | http://fasb.org/us-gaap/role/disclosure/RegulatedOperations | |
us-gaap:JointlyOwnedUtilityPlantInterestsLineItems | domain-member | http://fasb.org/us-gaap/role/disclosure/RegulatedOperationsJointlyOwnedUtilityPlantInterestsTable |