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Reportable Segments - Revenues From Major External Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 9,321	$ 8,352	$ 7,418
Houston Electric
Segment Reporting Information [Line Items]
Revenues	3,412	3,134	2,911
Affiliates of NRG | Houston Electric
Segment Reporting Information [Line Items]
Revenues	1,046	905	749
Affiliates of Vistra Energy Corp. | Houston Electric
Segment Reporting Information [Line Items]
Revenues	$ 489	$ 410	$ 404

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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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