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Reportable Segments - Schedule of Revenues From Major External Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 8,643	$ 8,696	$ 9,321
Houston Electric
Segment Reporting Information [Line Items]
Revenues	3,939	3,677	3,412
Affiliates of NRG | Houston Electric
Segment Reporting Information [Line Items]
Revenues	1,169	1,106	1,046
Affiliates of Vistra Energy Corp. | Houston Electric
Segment Reporting Information [Line Items]
Revenues	$ 605	$ 539	$ 489

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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