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Goodwill and Other Intangibles (CenterPoint Energy and CERC) - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | $ 4,160,000,000 |  | $ 4,294,000,000
Goodwill, impairment loss | $ 0 | $ 0 |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Energy Systems Group |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Held for Sale |  |  |  | $ 134,000,000 |
Loss on sale |  |  | 13,000,000 |  |
CERC Corp |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | $ 1,583,000,000 |  | $ 1,583,000,000

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