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Regulatory and Rate Matters - Schedule of Transmission Cost of Service Rates (Details) - PUCT - TNMP - USD ($) $ in Millions | Jul. 22, 2022 | Mar. 25, 2022 | Sep. 20, 2021 | Mar. 12, 2021
--- | --- | --- | --- | ---
Public Utilities, General Disclosures [Line Items] |  |  |  |
Approved Increase in Rate Base |  | $ 95.6 | $ 41.2 | $ 112.6
Annual Increase in Revenue |  | $ 14.2 | $ 6.3 | $ 14.1
Subsequent event |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Approved Increase in Rate Base | $ 36.0 |  |  |
Annual Increase in Revenue | $ 5.3 |  |  |

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