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Goodwill (CenterPoint Energy and CERC) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 4,160	$ 4,294
Disposal		134
Held for Sale	217
Goodwill, ending balance	3,943	4,160
CERC
Goodwill [Roll Forward]
Goodwill, beginning balance	1,583
Goodwill, ending balance	1,461	1,583
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | CERC
Goodwill [Roll Forward]
Goodwill, beginning balance	1,583
Held for Sale	122
Goodwill, ending balance	1,461	1,583
Electric
Goodwill [Roll Forward]
Goodwill, beginning balance	936	936
Disposal		0
Held for Sale	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	2,920
Disposal		0
Held for Sale	217
Goodwill, ending balance	2,703	2,920
Corporate and Other
Goodwill [Roll Forward]
Goodwill, beginning balance	304	438
Disposal		134
Held for Sale	0
Goodwill, ending balance	$ 304	$ 304

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