Commitments and Contingencies - Legal, Environmental and Other Matters (Details) $ in Thousands			1 Months Ended	6 Months Ended
	Jun. 30, 2024 USD ($) lawsuit gasManufacturingAndStorageSite insurer formerAffiliate	Apr. 02, 2024 Plaintiff lawsuit	May 31, 2024 site	Jun. 30, 2024 USD ($) ashPond gasManufacturingAndStorageSite lawsuit formerAffiliate insurer Defendant	Feb. 07, 2024 USD ($)	Feb. 28, 2023 lawsuit class
Long-Term Purchase Commitment [Line Items]
Number of owned coal ash ponds | ashPond				3
Number of sites identified for further investigation | site			3
F.B. Culley
Long-Term Purchase Commitment [Line Items]
Number of owned coal ash ponds | ashPond				2
A.B. Brown
Long-Term Purchase Commitment [Line Items]
Number of owned coal ash ponds | ashPond				1
F.B. Culley East
Long-Term Purchase Commitment [Line Items]
Number of owned coal ash ponds | ashPond				1
Accounting and ratemaking project relief, approved capital costs | $					$ 52,000
Accounting and ratemaking project relief, approved annual O & M expenses | $					$ 133
Indiana Gas Service Territory
Long-Term Purchase Commitment [Line Items]
Environmental remediation number of sites with potential remedial responsibility | gasManufacturingAndStorageSite	26			26
Environmental remediation investigation studies agreed upon number of sites | gasManufacturingAndStorageSite	1			1
SIGECO
Long-Term Purchase Commitment [Line Items]
Environmental remediation number of sites with potential remedial responsibility | gasManufacturingAndStorageSite	5			5
Minnesota and Indiana
Long-Term Purchase Commitment [Line Items]
Environmental remediation, number of sites sites owned or operated by bormer affiliate | formerAffiliate	1			1
CERC | Indiana Gas Service Territory
Long-Term Purchase Commitment [Line Items]
Environmental remediation number of sites with potential remedial responsibility | gasManufacturingAndStorageSite	26			26
Indiana Electric
Long-Term Purchase Commitment [Line Items]
Asset retirement obligation | $	$ 118,000			$ 118,000
Indiana Electric | Minimum
Long-Term Purchase Commitment [Line Items]
Estimated capital expenditure to clean ash ponds | $	60,000			60,000
Indiana Electric | Maximum
Long-Term Purchase Commitment [Line Items]
Estimated capital expenditure to clean ash ponds | $	$ 80,000			$ 80,000
Loss from Catastrophes
Long-Term Purchase Commitment [Line Items]
Pending lawsuits						12
Loss from Catastrophes | Harris County
Long-Term Purchase Commitment [Line Items]
Pending lawsuits						9
Uninsured Risk
Long-Term Purchase Commitment [Line Items]
Loss contingency, number of insurers | insurer	1			1
Litigation Related to the February 2021 Winter Storm Event | Pending Litigation
Long-Term Purchase Commitment [Line Items]
Pending lawsuits	220			220
February 2021 Winter Storm Event | Pending Litigation | CenterPoint Energy And Houston Electric Entities
Long-Term Purchase Commitment [Line Items]
Loss contingency, pending claims, number of lawsuits named as defendant				155
Multi District Litigation | February 2021 Putative Class Action
Long-Term Purchase Commitment [Line Items]
Pending lawsuits	1			1
Multi District Litigation | February 2021 Putative Class Action | Utility Holding, LLC
Long-Term Purchase Commitment [Line Items]
Pending lawsuits	1			1
Multi District Litigation | Cases Transferred to the Multi District Litigation (MDL)
Long-Term Purchase Commitment [Line Items]
Pending lawsuits	3	3		3
Multi District Litigation | Cases Transferred to the Multi District Litigation (MDL) | CES
Long-Term Purchase Commitment [Line Items]
Number of claims dismissed		3
Bellwether Cases | Pending Litigation
Long-Term Purchase Commitment [Line Items]
Pending lawsuits	5			5
Harris County vs. CERC - Putative | Loss from Catastrophes
Long-Term Purchase Commitment [Line Items]
Pending lawsuits						1
Number of classes of electric and natural gas customers | class						2
Other Texas Lawsuits Brought By Assignee vs. Company | Loss from Catastrophes
Long-Term Purchase Commitment [Line Items]
Pending lawsuits						2
Other Texas Lawsuits Brought By Assignee vs. Company | Loss from Catastrophes | Harris County
Long-Term Purchase Commitment [Line Items]
Pending lawsuits						1
Other Texas Lawsuits Brought By Assignee vs. Company | Loss from Catastrophes | Tom Green County
Long-Term Purchase Commitment [Line Items]
Pending lawsuits						1
Jefferson Parish and the State of Louisiana Under the SCLRMA | Pending Litigation
Long-Term Purchase Commitment [Line Items]
Pending lawsuits	42			42
Jefferson Parish and the State of Louisiana Under the SCLRMA | Suits Remanded to Louisiana Federal Couts
Long-Term Purchase Commitment [Line Items]
Pending lawsuits	42			42
Jefferson Parish | Pending Litigation | Predecessor Company, Primary Fuels, Inc.
Long-Term Purchase Commitment [Line Items]
Loss contingency, pending claims, number of lawsuits named as defendant | Defendant				1
Loss contingency, number of defendants				1
Multi District Litigation (MDL) Proceeding | Cases Transferred to the Multi District Litigation (MDL) | Harris County
Long-Term Purchase Commitment [Line Items]
Pending lawsuits	9			9
Hurricane Beryl | Pending Litigation | CenterPoint Energy And Houston Electric Entities
Long-Term Purchase Commitment [Line Items]
Loss Contingency, New Claims Filed, Number				3
Hurricane Beryl Class Action 1 | Pending Litigation | CenterPoint Energy And Houston Electric Entities
Long-Term Purchase Commitment [Line Items]
Loss Contingency, Damages Sought, Value | $	$ 100,000
Hurricane Beryl Class Action 3 | Pending Litigation | CenterPoint Energy And Houston Electric Entities
Long-Term Purchase Commitment [Line Items]
Loss Contingency, Damages Sought, Value | $	100,000
Hurricane Beryl Class Action 2 | Pending Litigation | CenterPoint Energy And Houston Electric Entities
Long-Term Purchase Commitment [Line Items]
Loss Contingency, Damages Sought, Value | $	100,000
Hurricane Beryl Personal Injury | Pending Litigation | CenterPoint Energy And Houston Electric Entities
Long-Term Purchase Commitment [Line Items]
Restore the electric delivery facility cost | $	$ 1,000			$ 1,000