Financing- Narrative (Details) $ in Millions	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
Expires, 2027	$ 125
Variable rate pollution control revenue bonds outstanding	1,700
MISSISSIPPI POWER CO
Debt Instrument [Line Items]
Expires, 2027	125
Variable rate pollution control revenue bonds outstanding	69
ALABAMA POWER CO
Debt Instrument [Line Items]
Expires, 2027	0
Variable rate pollution control revenue bonds outstanding	796
Fixed rate pollution control revenue bonds outstanding	120
GEORGIA POWER CO
Debt Instrument [Line Items]
Expires, 2027	0
Variable rate pollution control revenue bonds outstanding	819
Fixed rate pollution control revenue bonds outstanding	$ 155