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Loss Contingency, Pending Claims, Number of Lawsuits Named as Defendant

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Number Of Classes of Electric and Natural Gas Customers

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Number of Owned Coal Ash Ponds

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Solar Array Generating Capacity

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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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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Number of defendants named in a legal action.

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Commitments and Contingencies - Narrative (Details)			12 Months Ended
Commitments and Contingencies - Narrative (Details)	Jun. 08, 2023 USD ($)	Feb. 01, 2023 MW	Dec. 31, 2023 USD ($) lawsuit insurer ashPond gasManufacturingAndStorageSite formerAffiliate Defendant	Nov. 19, 2023 lawsuit	Feb. 28, 2023 lawsuit plaintiff_class	Jan. 11, 2023 MW	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Purchase Obligations
Guarantor obligations, maximum exposure, undiscounted \| $			$ 503,000,000
Additional guarantee \| $			$ 0
Number of owned coal ash ponds \| ashPond			3
Accounting and ratemaking project relief, estimated project costs \| $	$ 52,000,000
Asset retirement obligation \| $			$ 590,000,000				$ 610,000,000	$ 659,000,000
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
Number of owned coal ash ponds \| ashPond			1
CERC Corp
Purchase Obligations
Asset retirement obligation \| $			$ 380,000,000				$ 420,000,000	$ 479,000,000
Indiana Electric
Purchase Obligations
Asset retirement obligation \| $			116,000,000
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
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
Indiana Gas Service Territory \| CERC Corp
Purchase Obligations
Environmental remediation number of sites with potential remedial responsibility \| gasManufacturingAndStorageSite			26
SIGECO
Purchase Obligations
Environmental remediation number of sites with potential remedial responsibility \| gasManufacturingAndStorageSite			5
Minnesota and Indiana
Purchase Obligations
Environmental remediation sites sites owned or operated by \| formerAffiliate			1
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
Litigation Related to the February 2021 Winter Storm Event \| Pending Litigation
Purchase Obligations
Pending lawsuits			220
February 2021 Winter Storm Event \| Pending Litigation \| CenterPoint Energy, Houston Electric and Other Entities
Purchase Obligations
Number of lawsuits named as defendant			155
Harris County vs. CERC - Putative \| Loss from Catastrophes
Purchase Obligations
Pending lawsuits					1
Number of classes of electric and natural gas customers \| plaintiff_class					2
Multi District Litigation \| Cases Transferred to the Multi District Litigation (MDL)
Purchase Obligations
Pending lawsuits			3	9
Multi District Litigation \| Motions to Remand Lawsuits Out Of MDL And Back Into Original Trial Courts
Purchase Obligations
Pending lawsuits			3
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
Bellwether Cases \| Pending Litigation
Purchase Obligations
Pending lawsuits			5
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