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Goodwill (CenterPoint Energy and CERC) - Narrative (Details) - USD ($)	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Goodwill [Line Items]
Goodwill, impairment loss	$ 0	$ 0

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Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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