Contingencies - Other Matters (Details)	60 Months Ended
Contingencies - Other Matters (Details)	Jan. 15, 2024 USD ($)	Jun. 30, 2019 USD ($) Facility	May 17, 2019 USD ($)
ALABAMA POWER CO \| Damage from Unpermitted Discharge of Fluids and/or Pollutants \| Plant Gadsden
Loss Contingencies [Line Items]
Possible environmental penalty \| $			$ 250,000
GULF POWER CO \| Scenario, Forecast \| Plant Daniel Units 1 And 2
Loss Contingencies [Line Items]
Undivided ownership interest to be sold	50.00%
Undivided ownership interest, ownership interest in individual unit	100.00%
MISSISSIPPI POWER CO \| Scenario, Forecast \| Plant Daniel Units 1 And 2
Loss Contingencies [Line Items]
Payments to acquire business \| $	$ 1
Option to purchase, period	120 days
SOUTHERN Co GAS \| Natural Gas Storage Facility
Loss Contingencies [Line Items]
Combined net book value \| $		$ 438,000,000
SOUTHERN Co GAS \| Natural Gas Storage Facility \| Louisiana
Loss Contingencies [Line Items]
Number of facilities \| Facility		2
Number of facilities to be restored \| Facility		1
SOUTHERN Co GAS \| Natural Gas Storage Facility \| California
Loss Contingencies [Line Items]
Number of facilities \| Facility		2