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Goodwill and Other Intangibles (CenterPoint Energy and CERC) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning balance | $ 4,294 |  |  |
Disposals | 134 |  |  |
Goodwill, ending balance | 4,160 | $ 4,294 |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Gross Carrying Amount |  | 63 |  |
Accumulated Amortization |  | (25) |  |
Net Balance |  | 38 |  |
Depreciation and amortization expense |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Amortization expense of intangible assets recorded in depreciation and amortization | 3 | 6 | $ 6 |
Cost of Sales |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Amortization expense of intangible assets recorded in depreciation and amortization | 0 | 1 | $ 1 |
Customer relationships |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Gross Carrying Amount |  | 33 |  |
Accumulated Amortization |  | (16) |  |
Net Balance |  | 17 |  |
Trade names |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Gross Carrying Amount |  | 16 |  |
Accumulated Amortization |  | (6) |  |
Net Balance |  | 10 |  |
Operation and maintenance agreements |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Gross Carrying Amount |  | 12 |  |
Accumulated Amortization |  | (2) |  |
Net Balance |  | 10 |  |
Other |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |
Gross Carrying Amount |  | 2 |  |
Accumulated Amortization |  | (1) |  |
Net Balance |  | 1 |  |
Electric |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning balance | 936 |  |  |
Disposals | 0 |  |  |
Goodwill, ending balance | 936 | 936 |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |
Accumulated goodwill impairment charge |  |  |  | $ 185
Natural Gas |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning balance | 2,920 |  |  |
Disposals | 0 |  |  |
Goodwill, ending balance | 2,920 | 2,920 |  |
Corporate and Other |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning balance | 438 |  |  |
Disposals | 134 |  |  |
Goodwill, ending balance | $ 304 | $ 438 |  |

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