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Background and Basis of Presentation (Details) $ in Millions | Mar. 31, 2025 USD ($) | Mar. 07, 2025 USD ($) MW | Sep. 30, 2025 registrant
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of registrants | registrant |  |  | 3
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] |  |  |
Sale of disposal | $ 1,200 |  |
Alternative Energy | Posey Solar |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Power generation capacity, megawatts | MW |  | 191 |
Consideration transferred |  | $ 357 |
Alternative Energy | Posey Solar | SIGECO |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Percentage of posey solar assets acquired |  | 1 |

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