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Regulatory and Rate Matters - Schedule of Transmission Cost of Service Rates (Details) - PUCT - TNMP - USD ($) $ in Millions | May 12, 2023 | Sep. 22, 2022 | Mar. 25, 2022 | Sep. 20, 2021
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Public Utilities, General Disclosures [Line Items] |  |  |  |
Approved Increase in Rate Base | $ 150.5 | $ 36.0 | $ 95.6 | $ 41.2
Annual Increase in Revenue | $ 19.4 | $ 5.3 | $ 14.2 | $ 6.3

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