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Divestitures (CenterPoint Energy and CERC) - Divestitures Narrative (Details) mi in Thousands, $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 21, 2023 USD ($) | Apr. 29, 2021 USD ($) mi | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | May 31, 2022 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  | $ 0 | $ 0 | $ (12) | $ 303 |  |
Miles of pipeline (in miles) | mi |  | 17 |  |  |  |  |  |
Transition services agreement charges |  |  | 0 | 10 | 1 | 29 |  |
Transition services agreement, accounts receivable |  |  | 0 |  | 0 |  | $ 1 |
CERC |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestitures, net of cash divested |  |  |  |  | 0 | 2,075 |  |
Gain (loss) on sale |  |  | $ 0 | $ 0 | 0 | $ 557 |  |
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, net of cash divested | $ 154 |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  | (12) |  |  |
Transaction costs |  |  |  |  | 3 |  |  |
Current tax expense of divestiture |  |  |  |  | $ 33 |  |  |
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 divestitures, net of cash divested |  | $ 2,150 |  |  |  |  |  |
Gain (loss) on sale |  |  |  |  |  |  | 303 |
Transaction costs |  |  |  |  |  |  | 59 |
Recovery of costs |  | $ 425 |  |  |  |  |  |
Receivables, net |  |  |  |  |  |  |  | $ 15
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 |
Transaction costs |  |  |  |  |  |  | $ 59 |
Receivables, net |  |  |  |  |  |  |  | $ 15

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