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Held for Sale and Divestitures (CenterPoint Energy and CERC) - Narrative (Details) mi in Thousands, numberOfCustomer in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Feb. 19, 2024 USD ($) numberOfCustomer mi | May 21, 2023 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from divestitures |  |  |  | $ 0 | $ 145 |  |
Loss on divestitures |  | $ 0 | $ 0 | 0 | 12 |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Energy Systems Group |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Equity purchase agreement, purchase price |  |  |  |  |  |  | $ 157
Proceeds from divestitures | $ 154 |  |  |  |  |  |
Adjustments on working capital |  | $ 2 |  | $ 2 |  |  |
Loss on divestitures |  |  |  |  | 12 |  |
Transaction costs |  |  |  |  | 3 |  |
Current tax expense of divestiture |  |  |  |  | $ 33 |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | CERC | Louisiana and Mississippi Regulated Natural Gas LDC Businesses |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 1,200 |
Miles of pipeline (in miles) | mi |  |  |  |  |  | 12 |
Number of customers (more than) | numberOfCustomer |  |  |  |  |  | 0.3 |

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