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Regulatory Matters - Schedule of Allowed Equity Return Recognized (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Public Utilities, General Disclosures [Line Items]
Unrecognized equity return	$ 204		$ 204		$ 204
Allowed equity return recognized	12	$ 10	21	$ 18
Houston Electric
Public Utilities, General Disclosures [Line Items]
Unrecognized equity return	61		61		75
Allowed equity return recognized	11	9	19	16
CERC
Public Utilities, General Disclosures [Line Items]
Unrecognized equity return	79		79		$ 69
Allowed equity return recognized	$ 0	$ 0	$ 1	$ 1

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

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