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Subsequent Events (CenterPoint Energy) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Apr. 26, 2024 | Apr. 30, 2024 | Mar. 31, 2024
Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Common stock, dividends declared per share (in dollars per share) | $ 0.2000 |  |
At The Market Member |  |  |
Subsequent Event [Line Items] |  |  |
Cash proceeds |  |  | $ 3
Payments of Stock Issuance Costs |  |  | 1
Sale of Stock, Capacity Available Under Program |  |  | $ 496
At The Market Member | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Common stock issued (in shares) |  | 6,525,300 |
Cash proceeds |  | $ 182 |
Payments of Stock Issuance Costs |  | 2 |
Sale of Stock, Capacity Available Under Program |  | $ 313 |

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