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Commitments and Contingencies - Narrative (Details)			12 Months Ended
Commitments and Contingencies - Narrative (Details)	Apr. 02, 2024 lawsuit	Feb. 01, 2023 MW	Dec. 31, 2024 USD ($) day lawsuit ashPond Defendant gasManufacturingAndStorageSite insurer	Jan. 17, 2025 cases	Feb. 07, 2024 USD ($)	Feb. 02, 2024 lawsuit	Dec. 31, 2023 USD ($)	Feb. 28, 2023 lawsuit class	Jan. 11, 2023 MW	Dec. 31, 2022 USD ($)
Purchase Obligations
Guarantor obligations, maximum exposure, undiscounted \| $			$ 465,000,000
Additional guarantee \| $			$ 0
Number of owned coal ash ponds \| ashPond			3
Asset retirement obligation \| $			$ 588,000,000				$ 590,000,000			$ 610,000,000
F.B. Culley
Purchase Obligations
Number of owned coal ash ponds \| ashPond			2
A.B. Brown
Purchase Obligations
Number of owned coal ash ponds \| ashPond			1
F.B. Culley East
Purchase Obligations
Accounting and ratemaking project relief, approved capital costs \| $					$ 52,000,000
Accounting and ratemaking project relief, approved annual O & M expenses \| $					$ 133,000
Indiana Gas Service Territory
Purchase Obligations
Environmental remediation number of sites with potential remedial responsibility \| gasManufacturingAndStorageSite			26
Environmental remediation investigation studies agreed upon number of sites \| gasManufacturingAndStorageSite			1
SIGECO
Purchase Obligations
Environmental remediation number of sites with potential remedial responsibility \| gasManufacturingAndStorageSite			5
Loss from Catastrophes
Purchase Obligations
Pending lawsuits								12
Loss from Catastrophes \| Harris County
Purchase Obligations
Pending lawsuits								9
Uninsured Risk
Purchase Obligations
Number of insurers \| insurer			1
CERC
Purchase Obligations
Asset retirement obligation \| $			$ 363,000,000				$ 380,000,000			$ 420,000,000
CERC \| Indiana Gas Service Territory
Purchase Obligations
Environmental remediation number of sites with potential remedial responsibility \| gasManufacturingAndStorageSite			26
Indiana Electric
Purchase Obligations
Asset retirement obligation \| $			$ 11,000,000
Property, plant and equipment increase \| $			11,000,000
Indiana Electric \| Minimum
Purchase Obligations
Estimated capital expenditure to clean ash ponds \| $			60,000,000
Indiana Electric \| Maximum
Purchase Obligations
Estimated capital expenditure to clean ash ponds \| $			80,000,000
CenterPoint Energy
Purchase Obligations
Asset retirement obligation \| $			$ 121,000,000
Hurricane Harvey \| Pending Litigation \| CenterPoint Energy And Houston Electric Entities
Purchase Obligations
Loss contingency, new claims filed, number			3
Hurricane Beryl Class Action 1 \| Pending Litigation \| CenterPoint Energy And Houston Electric Entities
Purchase Obligations
Loss contingency, damages sought, value \| $			$ 100,000,000
Hurricane Beryl Class Action 2 \| Pending Litigation \| CenterPoint Energy And Houston Electric Entities
Purchase Obligations
Loss contingency, damages sought, value \| $			100,000,000
Hurricane Beryl Class Action 3 \| Pending Litigation \| CenterPoint Energy And Houston Electric Entities
Purchase Obligations
Loss contingency, damages sought, value \| $			100,000,000
Hurricane Beryl Personal Injury \| Pending Litigation \| CenterPoint Energy And Houston Electric Entities
Purchase Obligations
Restore the electric delivery facility cost \| $			$ 1,000,000
Litigation Related to the February 2021 Winter Storm Event \| Pending Litigation
Purchase Obligations
Pending lawsuits			220
February 2021 Winter Storm Event \| Pending Litigation
Purchase Obligations
Pending lawsuits \| day			220
February 2021 Winter Storm Event \| Pending Litigation \| CenterPoint Energy, Houston Electric and Other Entities
Purchase Obligations
Number of lawsuits named as defendant			155
Multi District Litigation \| February 2021 Putative Class Action
Purchase Obligations
Pending lawsuits			1
Multi District Litigation \| February 2021 Putative Class Action \| Utility Holding, LLC
Purchase Obligations
Pending lawsuits			1
Multi District Litigation \| Cases Transferred to the Multi District Litigation (MDL)
Purchase Obligations
Pending lawsuits	3					3
Multi District Litigation \| Cases Transferred to the Multi District Litigation (MDL) \| Subsequent Event
Purchase Obligations
Pending lawsuits \| cases				2
Multi District Litigation \| Cases Transferred to the Multi District Litigation (MDL) \| CES
Purchase Obligations
Number of claims dismissed	3
Bellwether Cases \| Pending Litigation
Purchase Obligations
Pending lawsuits			5
Harris County vs. CERC - Putative \| Loss from Catastrophes
Purchase Obligations
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
Purchase Obligations
Pending lawsuits								2
Other Texas Lawsuits Brought By Assignee vs. Company \| Loss from Catastrophes \| Harris County
Purchase Obligations
Pending lawsuits								1
Other Texas Lawsuits Brought By Assignee vs. Company \| Loss from Catastrophes \| Tom Green County
Purchase Obligations
Pending lawsuits								1
Jefferson Parish \| Pending Litigation
Purchase Obligations
Pending lawsuits			42
Jefferson Parish \| Suits Remanded to Louisiana Federal Couts
Purchase Obligations
Pending lawsuits			42
Jefferson Parish \| Pending Litigation \| Predecessor Company, Primary Fuels, Inc.
Purchase Obligations
Number of lawsuits named as defendant \| Defendant			1
Number of defendants			1
Posey Solar
Purchase Obligations
Solar array generating capacity (in MW) \| MW		191
Solar array assets, useful life		35 years
Pike Solar
Purchase Obligations
Solar array generating capacity (in MW) \| MW									130