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Goodwill and Other Intangibles (CenterPoint Energy and CERC) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 4,294		$ 4,294
Finite-Live Intangible Assets [Abstract]
Gross Carrying Amount	63		63
Accumulated Amortization	(26)		(25)
Net Balance	37		38
Finite-Lived Intangible Assets Amortization Expense Maturity Schedule [Abstract]
Remaining nine months of 2023	5
2024	5
2025	5
2026	5
2027	4
2028	4
Depreciation and amortization expense
Finite-Live Intangible Assets [Abstract]
Amortization expense of intangible assets recorded in Depreciation and amortization	1	$ 1
Customer relationships
Finite-Live Intangible Assets [Abstract]
Gross Carrying Amount	33		33
Accumulated Amortization	(17)		(16)
Net Balance	16		17
Trade names
Finite-Live Intangible Assets [Abstract]
Gross Carrying Amount	16		16
Accumulated Amortization	(6)		(6)
Net Balance	10		10
Operation and maintenance agreements
Finite-Live Intangible Assets [Abstract]
Gross Carrying Amount	12		12
Accumulated Amortization	(2)		(2)
Net Balance	10		10
Other
Finite-Live Intangible Assets [Abstract]
Gross Carrying Amount	2		2
Accumulated Amortization	(1)		(1)
Net Balance	1		1
CERC
Goodwill [Line Items]
Goodwill	1,583		1,583
Electric
Goodwill [Line Items]
Goodwill	936		936
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Accumulated goodwill impairment charge				$ 185
Natural Gas
Goodwill [Line Items]
Goodwill	2,920		2,920
Corporate and Other
Goodwill [Line Items]
Goodwill	$ 438		$ 438

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