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Regulatory Matters - Schedule of Allowed Equity Return Recognized (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Public Utilities, General Disclosures [Line Items]
Unrecognized equity return	$ 226		$ 226		$ 204
Allowed equity return recognized	1	$ 14	22	$ 32
Houston Electric
Public Utilities, General Disclosures [Line Items]
Unrecognized equity return	76		76		75
Allowed equity return recognized	0	14	19	30
CERC
Public Utilities, General Disclosures [Line Items]
Unrecognized equity return	85		85		$ 69
Allowed equity return recognized	$ 1	$ 0	$ 2	$ 1

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Amount Of Allowed Equity Return Not Recognized In Period

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- Definition

Amount of allowed equity return on the true-up balance that was recognized in the period

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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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