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Acquisition and Divestiture (CenterPoint Energy and CERC) - Schedule of Asset and Liabilities Held for Sale (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total current assets held for sale | $ 0 | $ 1,361
Total current liabilities held for sale | 0 | 176
CERC |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total current assets held for sale | 0 | 1,266
Total current liabilities held for sale | $ 0 | 176
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana and Mississippi Regulated Natural Gas LDC Businesses |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Receivables, net |  | 27
Total current assets held for sale |  | 1,361
Total current liabilities held for sale |  | 176
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana and Mississippi Regulated Natural Gas LDC Businesses | CERC |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Receivables, net |  | 27
Total current assets held for sale |  | 1,266
Total current liabilities held for sale |  | 176
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana And Mississippi Natural Gas LDC Businesses |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Accrued unbilled revenues |  | 26
Materials and supplies |  | 13
Natural gas inventory |  | 5
Property, plant and equipment, net |  | 1,052
Goodwill |  | 217
Regulatory assets |  | 15
Other |  | 6
Short-term borrowings |  | 3
Accounts payable |  | 44
Customer deposits |  | 14
Regulatory liabilities |  | 31
Other |  | 84
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] |  |
Accrued unbilled revenues |  | 26
Materials and supplies |  | 13
Natural gas inventory |  | 5
Property, plant and equipment, net |  | 1,052
Goodwill |  | 122
Regulatory assets |  | 15
Other |  | 6
Short-term borrowings |  | 3
Accounts payable |  | 44
Customer deposits |  | 14
Regulatory liabilities |  | 31
Other |  | $ 84

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