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Goodwill (CenterPoint Energy and CERC) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2020
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | $ 4,160 |
Held For Sale | 217 |
Goodwill, ending balance | 3,943 |
CERC |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 1,583 |
Held For Sale | 122 |
Goodwill, ending balance | 1,461 |
Electric |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 936 |
Held For Sale | 0 |
Goodwill, ending balance | 936 |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |
Accumulated goodwill impairment charge |  | $ 185
Natural gas |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 2,920 |
Held For Sale | 217 |
Goodwill, ending balance | 2,703 |
Corporate and Other |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 304 |
Held For Sale | 0 |
Goodwill, ending balance | $ 304 |

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