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v3.23.3

Goodwill and Other Intangibles (CenterPoint Energy and CERC) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2020
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, beginning balance |  |  | $ 4,294 |  |  |
Disposals |  |  | 134 |  |  |
Goodwill, ending balance | $ 4,160 |  | 4,160 |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |  |  |
Gross Carrying Amount | 2 |  | 2 |  | $ 63 |
Accumulated Amortization | (1) |  | (1) |  | (25) |
Net Balance | 1 |  | 1 |  | 38 |
Depreciation and amortization expense |  |  |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |  |  |
Amortization expense of intangible assets recorded in Depreciation and amortization | 0 | $ 1 | 3 | $ 4 |  |
Customer relationships |  |  |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |  |  |
Gross Carrying Amount | 0 |  | 0 |  | 33 |
Accumulated Amortization | 0 |  | 0 |  | (16) |
Net Balance | 0 |  | 0 |  | 17 |
Trade names |  |  |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |  |  |
Gross Carrying Amount | 0 |  | 0 |  | 16 |
Accumulated Amortization | 0 |  | 0 |  | (6) |
Net Balance | 0 |  | 0 |  | 10 |
Operation and maintenance agreements |  |  |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |  |  |
Gross Carrying Amount | 0 |  | 0 |  | 12 |
Accumulated Amortization | 0 |  | 0 |  | (2) |
Net Balance | 0 |  | 0 |  | 10 |
Other |  |  |  |  |  |
Finite-Live Intangible Assets [Abstract] |  |  |  |  |  |
Gross Carrying Amount | 2 |  | 2 |  | 2 |
Accumulated Amortization | (1) |  | (1) |  | (1) |
Net Balance | 1 |  | 1 |  | $ 1 |
CERC |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, beginning balance |  |  | 1,583 |  |  |
Goodwill, ending balance | 1,583 |  | 1,583 |  |  |
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 |  | $ 304 |  |  |

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