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Accounting and Ratemaking Project Relief, Approved Capital Costs

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Environmental Remediation, Number of Sites Sites Owned or Operated By Former Affiliate

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Number of sites identified where the entity may potentially have some remedial responsibility

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Estimated Capital Expenditure to Clean Ash Ponds

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Guarantor Obligations, Additional Guarantee In Relation to Maximum Exposure

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Loss Contingency, Number of Insurers

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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 Assets, Useful Life

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Number of defendants named in a legal action.

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Commitments and Contingencies - Narrative (Details)		3 Months Ended
Commitments and Contingencies - Narrative (Details)	Feb. 01, 2023 MW	Mar. 31, 2024 USD ($) lawsuit ashPond insurer gasManufacturingAndStorageSite formerAffiliate Defendant	Feb. 07, 2024 USD ($)	Nov. 19, 2023 lawsuit	Feb. 28, 2023 lawsuit class	Jan. 11, 2023 MW
Long-Term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted \| $		$ 489,000,000
Guarantor obligations, additional guarantee In relation to maximum exposure \| $		$ 0
Number of owned coal ash ponds \| ashPond		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 \| $			$ 52,000,000
Accounting and ratemaking project relief, approved annual O & M expenses \| $			$ 133,000
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
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
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 \| $		$ 117,000,000
Indiana Electric \| Minimum
Long-Term Purchase Commitment [Line Items]
Estimated capital expenditure to clean ash ponds \| $		60,000,000
Indiana Electric \| Maximum
Long-Term Purchase Commitment [Line Items]
Estimated capital expenditure to clean ash ponds \| $		$ 80,000,000
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 \| CenterPoint Energy, Houston Electric and Other 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
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		9
Bellwether Cases \| Pending Litigation
Long-Term Purchase Commitment [Line Items]
Pending lawsuits		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
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
Posey Solar
Long-Term Purchase Commitment [Line Items]
Solar array generating capacity (in MW) \| MW	191
Solar array assets, useful life	35 years
Pike Solar
Long-Term Purchase Commitment [Line Items]
Solar array generating capacity (in MW) \| MW						130