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Introduction - Storm Damage Reserves (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2023
USD ($)
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Balance at December 31, 2022 $ 216
Balance at June 30, 2023 159
Accrued Storm Reserve  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Accrual 28
Storm Reserve  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Weather-related damages (85)
ALABAMA POWER CO  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Balance at December 31, 2022 97
Balance at June 30, 2023 79
ALABAMA POWER CO | Accrued Storm Reserve  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Accrual 6
ALABAMA POWER CO | Storm Reserve  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Weather-related damages (24)
GEORGIA POWER CO  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Balance at December 31, 2022 83
Balance at June 30, 2023 41
GEORGIA POWER CO | Accrued Storm Reserve  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Accrual 16
GEORGIA POWER CO | Storm Reserve  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Weather-related damages (58)
MISSISSIPPI POWER CO  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Balance at December 31, 2022 36
Balance at June 30, 2023 39
MISSISSIPPI POWER CO | Accrued Storm Reserve  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Accrual 6
MISSISSIPPI POWER CO | Storm Reserve  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]  
Weather-related damages $ (3)