REGULATORY MATTERS - GPC Fuel Cost and Storm Damage Recovery (Details) - USD ($) $ in Millions			1 Months Ended	6 Months Ended	12 Months Ended	24 Months Ended
	May 16, 2023	Jan. 01, 2023	Nov. 30, 2021	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]
To be recovered amount	$ 2,200
Net regulatory assets					$ 6,523	$ 5,833
Georgia Power
Public Utilities, General Disclosures [Line Items]
Public utilities, approved rate increase (decrease), amount			$ 252
Adjustment to fuel cost recovery rate if under recovered fuel balance exceeds budget thereafter				$ 200
Recovery period	3 years
Approved rate increase, percent			15.00%
Over (under) recovered fuel balance					$ (1,900)	(2,100)
Required period for options and hedges					36 months
Storm damage reserves		$ 31				213
Regulatory liabilities					$ 54	83
Net regulatory assets					5,090	$ 4,663
Requested rate increase (decrease), percentage	54.00%
Requested rate increase (decrease), amount	$ 1,100
Georgia Power | Under Recovered Fuel Clause Revenues
Public Utilities, General Disclosures [Line Items]
Over (under) recovered fuel balance					(694)
Georgia Power | Deferred Under Recovered Fuel Clause Revenues
Public Utilities, General Disclosures [Line Items]
Over (under) recovered fuel balance					(1,200)
Georgia Power | Other regulatory assets, current
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities					31
Georgia Power | Other Regulatory Assets
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities					$ 23
Georgia Power | Maximum
Public Utilities, General Disclosures [Line Items]
Public utilities, approved rate increase (decrease), amount	$ 200
Approved rate increase, percent	40.00%