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Commitments and Contingencies - Legal, Environmental and Other Matters (Details) $ in Thousands |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
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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 |  |  |  |  |

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