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Goodwill and Other Intangibles (CenterPoint Energy and CERC) - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Goodwill [Line Items] |  |  |  |
Loss on sale | $ 0 | $ 0 | $ 12 | $ (303)
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Energy Systems Group |  |  |  |
Goodwill [Line Items] |  |  |  |
Held for sale | $ 134 |  | 134 |
Loss on sale |  |  | $ 12 |

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