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Divestitures (CenterPoint Energy and CERC) - Divestitures Narrative (Details) mi in Thousands, $ in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 21, 2023 USD ($) | Apr. 29, 2021 USD ($) mi | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | May 31, 2022 USD ($) | Dec. 02, 2021 | Aug. 31, 2021 state
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  | $ 144 | $ 2,075 | $ 22 |  |  |
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 | 40 |  |  |  |
Transition services receivables |  |  | 0 | 1 |  |  |  |
Gain (loss) on sale |  |  | (13) | 303 | 8 |  |  |
Common and preferred units acquired (as a percent) |  |  |  |  |  |  | 100.00% |
CERC Corp |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  | 0 | 2,075 | 22 |  |  |
Gain (loss) on sale |  |  | 0 | 557 | 11 |  |  |
MES |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of states | state |  |  |  |  |  |  |  | 48
Gain (loss) on sale |  |  |  |  | 8 |  |  |
MES | CERC Corp |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  | $ 11 |  |  |
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 divestiture of businesses | $ 154 |  |  |  |  |  |  |
Payable on divestiture |  |  | 2 |  |  |  |  |
Gain (loss) on sale |  |  | (13) |  |  |  |  |
Disposal group, not discontinued operations, transaction costs |  |  | 3 |  |  |  |  |
Current tax expense of divestiture |  |  | $ 32 |  |  |  |  |
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 |  |  |  |  |  |
Gain (loss) on sale |  |  |  | 303 |  |  |  |
Disposal group, not discontinued operations, transaction costs |  |  |  | 59 |  |  |  |
Recovery of costs |  | $ 425 |  |  |  |  |  |
Disposal group, including discontinued operation, accounts, notes and loans receivable, net |  |  |  |  |  | $ 15 |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Arkansas and Oklahoma Natural Gas Businesses | CERC Corp |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  | 557 |  |  |  |
Disposal group, not discontinued operations, transaction costs |  |  |  | $ 59 |  |  |  |
Disposal group, including discontinued operation, accounts, notes and loans receivable, net |  |  |  |  |  | $ 15 |  |

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