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Regulatory and Rate Matters - TNMP Narrative (Details) - TNMP |  |  |  |  | 9 Months Ended |  |  |  |  |  |  |
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Jul. 18, 2022 USD ($) | Apr. 05, 2022 USD ($) | Jul. 01, 2021 USD ($) | Apr. 05, 2021 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2022 USD ($) | Sep. 24, 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 | $ 6,800,000 | $ 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 |  |
Energy efficiency cost recovery factor, approved settlement amount |  |  |  |  |  |  | $ 7,300,000 |  |  |  |  |
Energy efficiency cost recovery factor, approved performance bonus |  |  |  |  |  |  |  | $ 1,900,000 |  |  |  |
Rider charge from electricity relief program (per MWh) | MWh |  |  |  |  |  |  |  |  |  |  |  | 0.33
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 |  |  |  |  |  | $ 700,000 |  |  | $ 0 |  | $ 100,000 |

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