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Commitments and Contingencies - Narrative (Details) |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
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 |  |

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