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Background and Basis of Presentation (Details) $ in Millions	Mar. 31, 2025 USD ($) registrant	Mar. 07, 2025 USD ($) MW
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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