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Goodwill and Other Intangibles (CenterPoint Energy and CERC) - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill			$ 4,160,000,000		$ 4,294,000,000
Goodwill, impairment loss	$ 0	$ 0
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Energy Systems Group
Goodwill [Line Items]
Held for Sale				$ 134,000,000
Loss on sale			13,000,000
CERC Corp
Goodwill [Line Items]
Goodwill			$ 1,583,000,000		$ 1,583,000,000

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