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Regulatory and Rate Matters - TNMP Narrative (Details) - TNMP					9 Months Ended
	Jul. 19, 2022 USD ($)	Apr. 05, 2022 USD ($)	Jul. 01, 2021 USD ($)	Apr. 05, 2021 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2022 USD ($)	May 27, 2022 USD ($)	Dec. 31, 2021 USD ($)	May 27, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 30, 2020 MWh
Public Utilities, Commitments And Contingencies [Line Items]
Requested increase in annual distribution revenue		$ 9,700,000		$ 14,000,000
Increase in revenue base rate		$ 100,700,000		$ 104,500,000
Collection of increase in annual distribution revenues			$ 13,500,000
Energy efficiency cost recovery, requested change amount							$ 1,900,000		$ 7,200,000
Energy efficiency cost recovery, requested bonus							$ 7,400,000		$ 2,300,000
Rider charge from electricity relief program (per MWh) | MWh											0.33
Subsequent event
Public Utilities, Commitments And Contingencies [Line Items]
Requested increase in annual distribution revenue	$ 6,800,000
PUCT
Public Utilities, Commitments And Contingencies [Line Items]
Public utilities, costs of deployment					$ 9,000,000.0
COVID-19
Public Utilities, Commitments And Contingencies [Line Items]
Regulatory liability						$ 400,000		$ 0		$ 100,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 405
-Section 25
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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