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Related Party Transactions (Houston Electric and CERC) - Schedule of Amounts Charged For Services (Details) - Operation And Maintenance Expense - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Houston Electric
Related Party Transaction [Line Items]
Net affiliate service charges (billings)	$ (5)	$ (10)	$ 15
CERC
Related Party Transaction [Line Items]
Net affiliate service charges (billings)	5	10	(15)
CenterPoint Energy | Houston Electric
Related Party Transaction [Line Items]
Corporate service charges	173	173	167
CenterPoint Energy | CERC
Related Party Transaction [Line Items]
Corporate service charges	$ 213	$ 236	$ 237

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-Topic 850
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