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Regulatory and Rate Matters - Schedule of Transmission Cost of Service Rates (Details) - PUCT - TNMP - USD ($) $ in Millions	Mar. 15, 2024	Sep. 06, 2023	May 12, 2023
Public Utilities, General Disclosures [Line Items]
Approved Increase in Rate Base	$ 97.4	$ 21.4	$ 150.5
Annual Increase in Revenue	$ 13.1	$ 4.2	$ 19.4

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Public Utilities, Increase Annual Transmission Service Revenue

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Amount of public utility's approved rate increase (decrease) by regulatory agency.

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