ASSET RETIREMENT OBLIGATIONS - Estimated Costs of Decommissioning (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Alabama Power \| Plant Farley
Public Utilities, General Disclosures [Line Items]
Decommissioning periods: Beginning year	2037
Decommissioning periods: Completion year	2087
Site study costs	$ 2,048
Alabama Power \| Radiated structures \| Plant Farley
Public Utilities, General Disclosures [Line Items]
Site study costs	1,402
Alabama Power \| Spent fuel management \| Plant Farley
Public Utilities, General Disclosures [Line Items]
Site study costs	513
Alabama Power \| Non-radiated structures \| Plant Farley
Public Utilities, General Disclosures [Line Items]
Site study costs	$ 133
Georgia Power \| Plant Hatch
Public Utilities, General Disclosures [Line Items]
Decommissioning periods: Beginning year	2034
Decommissioning periods: Completion year	2088
Site study costs	$ 1,178
Georgia Power \| Plant Vogtle Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Decommissioning periods: Beginning year	2047
Decommissioning periods: Completion year	2092
Site study costs	$ 1,036
Georgia Power \| Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Decommissioning periods: Beginning year	2062
Decommissioning periods: Completion year	2074
Site study costs	$ 776
Georgia Power \| Radiated structures \| Plant Hatch
Public Utilities, General Disclosures [Line Items]
Site study costs	795
Georgia Power \| Radiated structures \| Plant Vogtle Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Site study costs	674
Georgia Power \| Radiated structures \| Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Site study costs	599
Georgia Power \| Spent fuel management \| Plant Hatch
Public Utilities, General Disclosures [Line Items]
Site study costs	306
Georgia Power \| Spent fuel management \| Plant Vogtle Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Site study costs	255
Georgia Power \| Spent fuel management \| Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Site study costs	88
Georgia Power \| Non-radiated structures \| Plant Hatch
Public Utilities, General Disclosures [Line Items]
Site study costs	77
Georgia Power \| Non-radiated structures \| Plant Vogtle Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Site study costs	107
Georgia Power \| Non-radiated structures \| Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Site study costs	$ 89