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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, 2022	Dec. 31, 2021	Dec. 31, 2020
Houston Electric
Related Party Transaction [Line Items]
Net affiliate service charges (billings)	$ 15	$ (7)	$ (16)
CERC Corp
Related Party Transaction [Line Items]
Net affiliate service charges (billings)	(15)	7	16
CenterPoint Energy | Houston Electric
Related Party Transaction [Line Items]
Corporate service charges	167	189	197
CenterPoint Energy | CERC Corp
Related Party Transaction [Line Items]
Corporate service charges	$ 237	$ 257	$ 232

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- Definition

Amount of net service charges from (billings to) related party during the period, excluding transactions that are eliminated in consolidated or combined financial statements.

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- Definition

Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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