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Acquisitions and Dispositions - Southern Company Gas (Details)
$ in Millions
3 Months Ended 9 Months Ended
May 20, 2022
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 07, 2022
USD ($)
storageFacility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on sale     $ 41 $ 171  
SOUTHERN Co GAS          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on sale     $ 5 $ 127  
SOUTHERN Co GAS | Natural Gas Storage Facilities | Disposal Group, Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of natural gas storage facilities sold | storageFacility         2
Purchase price         $ 186
SOUTHERN Co GAS | Natural Gas Storage Facilities | Disposal Group, Disposed of by Sale | Scenario, Forecast          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on sale   $ (125)      
Gain (loss) on dispositions, after tax   $ (95)      
SOUTHERN Co GAS | Pivotal LNG | Disposal Group, Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from divestiture of businesses, amount held back $ 5