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Goodwill (CenterPoint Energy and CERC) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 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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Goodwill, Held-for-Sale

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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