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Equity (CenterPoint Energy) - Schedule of Series A Preferred Stock (Details) - Series A Preferred Stock - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Preferred stock liquidation preference (in dollar per share) $ 1,000   $ 1,000  
Cumulative preferred stock, outstanding (in shares) 0 0   800
Preferred stock, value outstanding $ 0 $ 0   $ 790