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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Number of claims dismissed.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Commitments and Contingencies - Legal, Environmental and Other Matters (Details) $ in Thousands				1 Months Ended		9 Months Ended	12 Months Ended
	Jan. 08, 2025 Plaintiff	Nov. 11, 2024 Case	Apr. 02, 2024 lawsuit	Sep. 30, 2024 USD ($)	Feb. 28, 2023 Case lawsuit class	Sep. 30, 2025 USD ($) gasManufacturingAndStorageSite lawsuit insurer Defendant individual ashPond formerAffiliate Case	Dec. 31, 2024 USD ($)	Jul. 30, 2025 lawsuit	Apr. 02, 2024 Plaintiff	Feb. 07, 2024 USD ($)	Feb. 02, 2024 lawsuit
Long-Term Purchase Commitment [Line Items]
Number of owned coal ash ponds \| ashPond						3
Asset retirement obligation \| $						$ 137,000
F.B. Culley
Long-Term Purchase Commitment [Line Items]
Number of owned coal ash ponds \| ashPond						2
F.B. Culley East
Long-Term Purchase Commitment [Line Items]
Accounting and ratemaking project relief, approved capital costs \| $										$ 52,000
Accounting and ratemaking project relief, approved annual O & M expenses \| $										$ 133
A.B. Brown
Long-Term Purchase Commitment [Line Items]
Number of owned coal ash ponds \| ashPond						1
Indiana Gas Service Territory
Long-Term Purchase Commitment [Line Items]
Environmental remediation number of sites with potential remedial responsibility \| gasManufacturingAndStorageSite						26
Environmental remediation investigation studies agreed upon number of sites \| gasManufacturingAndStorageSite						1
SIGECO
Long-Term Purchase Commitment [Line Items]
Environmental remediation number of sites with potential remedial responsibility \| gasManufacturingAndStorageSite						5
Minnesota and Indiana
Long-Term Purchase Commitment [Line Items]
Environmental remediation, number of sites sites owned or operated by bormer affiliate \| formerAffiliate						1
Loss from Catastrophes
Long-Term Purchase Commitment [Line Items]
Pending lawsuits					12
Uninsured Risk
Long-Term Purchase Commitment [Line Items]
Loss contingency, number of insurers \| insurer						1
Harris County \| Loss from Catastrophes
Long-Term Purchase Commitment [Line Items]
Pending lawsuits					9
CERC \| Indiana Gas Service Territory
Long-Term Purchase Commitment [Line Items]
Environmental remediation number of sites with potential remedial responsibility \| gasManufacturingAndStorageSite						26
Indiana Electric
Long-Term Purchase Commitment [Line Items]
Asset retirement obligation \| $							$ 11,000
Property, plant and equipment increase \| $							$ 11,000
Indiana Electric \| Minimum
Long-Term Purchase Commitment [Line Items]
Estimated capital expenditure to clean ash ponds \| $						$ 60,000
Indiana Electric \| Maximum
Long-Term Purchase Commitment [Line Items]
Estimated capital expenditure to clean ash ponds \| $						$ 80,000
Pending Litigation \| CenterPoint Energy And Houston Electric Entities
Long-Term Purchase Commitment [Line Items]
Pending lawsuits								2
Number of individuals plaintiffs, one								220
Number of individuals plaintiffs, two								45
Loss contingency, number of insurers denial of indemnity coverage \| individual						2
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 2 \| 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 Personal Injury \| Pending Litigation \| CenterPoint Energy And Houston Electric Entities
Long-Term Purchase Commitment [Line Items]
Potential disallowance of recovery of costs \| $						$ 1,000
Litigation Related to the February 2021 Winter Storm Event \| Pending Litigation
Long-Term Purchase Commitment [Line Items]
Pending lawsuits						220
February 2021 Winter Storm Event \| Pending Litigation
Long-Term Purchase Commitment [Line Items]
Pending lawsuits \| Case						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 \| Loss from Catastrophes
Long-Term Purchase Commitment [Line Items]
Loss contingency, claims settled, number \| Case					3
Multi District Litigation \| February 2021 Putative Class Action
Long-Term Purchase Commitment [Line Items]
Pending lawsuits						1
Multi District Litigation \| February 2021 Putative Class Action \| Utility Holding, LLC
Long-Term Purchase Commitment [Line Items]
Pending lawsuits						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	3
Bellwether Cases \| Pending Litigation
Long-Term Purchase Commitment [Line Items]
Pending lawsuits						5
Bellwether Cases \| Threatened Litigation
Long-Term Purchase Commitment [Line Items]
Pending lawsuits						1
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
Harris County vs. CERC - Putative \| Pending Litigation \| Harris County
Long-Term Purchase Commitment [Line Items]
Number of plaintiffs \| Plaintiff	140
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 \| Harris County \| Loss from Catastrophes
Long-Term Purchase Commitment [Line Items]
Pending lawsuits					1
Other Texas Lawsuits Brought By Assignee vs. Company \| Tom Green County \| Loss from Catastrophes
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
Loss contingency, number of lawsuits progressed to state court						2
Jefferson Parish and the State of Louisiana Under the SCLRMA \| Pending Litigation \| Chevron Corporation
Long-Term Purchase Commitment [Line Items]
Potential disallowance of recovery of costs \| $						$ 744,600
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
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