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Commitments and Contingencies - Narrative (Details) |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
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

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