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Commitments and Contingencies - Narrative (Details) $ in Millions |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 08, 2023 USD ($) | Feb. 01, 2023 MW | Sep. 30, 2023 USD ($) gasManufacturingAndStorageSite lawsuit ashPond day | Feb. 28, 2023 lawsuit class | Jan. 11, 2023 MW
Long-Term Purchase Commitment [Line Items] |  |  |  |  |
Guarantor obligations, maximum exposure, undiscounted | $ |  |  | $ 509 |  |
Number of owned coal ash ponds | ashPond |  |  | 3 |  |
Estimated project costs | $ | $ 52 |  |  |  |
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 |  |
Indiana Gas Service Territory |  |  |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |  |  |
Environmental remediation number of sites with potential remedial responsibility | gasManufacturingAndStorageSite |  |  | 26 |  |
SIGECO |  |  |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |  |  |
Environmental remediation number of sites with potential remedial responsibility | gasManufacturingAndStorageSite |  |  | 5 |  |
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 | $ |  |  | $ 116 |  |
Indiana Electric | Minimum |  |  |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |  |  |
Estimated capital expenditure to clean ash ponds | $ |  |  | 60 |  |
Indiana Electric | Maximum |  |  |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |  |  |
Estimated capital expenditure to clean ash ponds | $ |  |  | $ 80 |  |
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 |
Texas State Court in Harris County, Texas | Pending Litigation |  |  |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |  |  |
Pending lawsuits |  |  | 1 |  |
Bellwether Cases | Pending Litigation |  |  |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |  |  |
Pending lawsuits |  |  | 5 |  |
February 2021 Winter Storm Event | Utility Holding, LLC |  |  |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |  |  |
Pending lawsuits | day |  |  | 5 |  |
February 2021 Winter Storm Event | Loss from Catastrophes |  |  |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |  |  |
Pending lawsuits |  |  | 220 |  |
February 2021 Winter Storm Event | Loss from Catastrophes | CenterPoint Energy and Houston Electric |  |  |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |  |  |
Pending lawsuits |  |  | 155 |  |
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 |
Multi District Litigation | Cases Transferred to the Multi District Litigation (MDL) |  |  |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |  |  |
Pending lawsuits |  |  | 3 |  |
Multi District Litigation | Motions to Remand Lawsuits Out Of MDL And Back Into Original Trial Courts |  |  |  |  |
Long-Term Purchase Commitment [Line Items] |  |  |  |  |
Pending lawsuits |  |  | 3 |  |
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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