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Equity (CenterPoint Energy) - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions				12 Months Ended
	Aug. 09, 2024	Jan. 10, 2024	Sep. 01, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023
Stock issued (in shares)	9,754,194
Common stock, par value (in dollars per share)	$ 25.36			$ 0.01	$ 0.01	$ 0.01
Proceeds from issuance of common stock	$ 247			$ 494	$ 0	$ 0
Series A Preferred Stock
Cumulative preferred stock, aggregate liquidation preference							$ 800
Preferred stock liquidation preference (in dollar per share)				$ 1,000			$ 1,000
Preferred stock redemption price (in dollars per share)			$ 1,000
Preferred stock dividend rate				6.125%
Redemption of series A preferred stock (in shares)			800,000
At The Market
Stock issued (in shares)				8,790,848
Proceeds from issuance of common stock				$ 247
Payments of stock issuance costs				2
Sale of stock, capacity available under program				$ 250
Common Stock
Stock issued (in shares)				19,000,000	0	0
Maximum | Common Stock | At The Market
Sale of stock, gross sale price		$ 500

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