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Held for Sale and Divestitures (CenterPoint Energy and CERC) - Narrative (Details) mi in Thousands, $ in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 21, 2023 USD ($) | Apr. 29, 2021 USD ($) mi | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Nov. 30, 2024 USD ($) | Feb. 19, 2024 USD ($) mi | May 31, 2022 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  | $ 0.0 | $ 144.0 | $ 2,075.0 |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Gain (loss) on sale |  |  |  |  |
Miles of pipeline | mi |  | 17 |  |  |  |  |  |
Reimbursement of transition services |  |  |  | 1.0 | 40.0 |  |  |
Transition services receivables |  |  |  | 0.0 |  |  |  |
CERC |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  | $ 0.0 | $ 0.0 | 2,075.0 |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana And Mississippi Natural Gas LDC Businesses | CERC |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 1,200.0 |
Miles of pipeline (in miles) | mi |  |  |  |  |  |  | 12 |
Number of customers (more than) |  |  |  |  |  |  | 0.3 |
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 | $ 157.0 |  |  |  |  |  |  |
Proceeds from divestiture of businesses | $ 154.0 |  |  |  |  |  |  |
Working capital and other adjustment |  |  |  |  |  | $ 2.0 |  |
Gain (loss) on sale |  |  | (13.0) |  |  |  |  |
Disposal group, not discontinued operations, transaction costs |  |  | 3.0 |  |  |  |  |
Current tax expense of divestiture |  |  | $ 32.0 |  |  |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Arkansas and Oklahoma Natural Gas Businesses |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  | $ 2,150.0 |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  | 303.0 |  |  |
Disposal group, not discontinued operations, transaction costs |  |  |  |  | 59.0 |  |  |
Recovery of costs |  | $ 425.0 |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  | $ 15.0
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Arkansas and Oklahoma Natural Gas Businesses | CERC |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  | 557.0 |  |  |
Disposal group, not discontinued operations, transaction costs |  |  |  |  | $ 59.0 |  |  |
Accounts receivable, net |  |  |  |  |  |  |  | $ 15.0

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