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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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