Equity (CenterPoint Energy) - Narrative (Details) - USD ($)		1 Months Ended			12 Months Ended
	Sep. 01, 2023	Feb. 28, 2023	Feb. 28, 2022	Jul. 31, 2021	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Jul. 20, 2021
Cumulative preferred stock, aggregate liquidation preference					$ 0		$ 800
Chief Executive Officer
Shares authorized for issuance under long-term incentive plans (in shares)								1,000,000
Chief Executive Officer | Restricted Stock Units (RSUs)
RSUs granted (in shares)		200,000	400,000	400,000
Series A Preferred Stock
Cumulative preferred stock, aggregate liquidation preference						$ 800,000,000
Preferred stock liquidation preference (in dollar per share)					$ 1,000	$ 1,000
Preferred stock redemption price (per share)	$ 1,000
Preferred stock dividend rate					6.125%
Redemption of Series A Preferred Stock (in shares)	800,000