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Introduction - Asset Retirement Obligations (Details) - USD ($)
$ in Millions
1 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 06, 2023
GEORGIA POWER CO      
Schedule of Asset Retirement Obligation [Line Items]      
Asset retirement obligation, period increase (decrease) $ 175    
ALABAMA POWER CO      
Schedule of Asset Retirement Obligation [Line Items]      
Asset retirement obligation, period increase (decrease)   $ 15  
Plant Vogtle Unit 3      
Schedule of Asset Retirement Obligation [Line Items]      
Asset retirement obligations     $ 90