REGULATORY MATTERS - GPC Fuel Cost and Storm Damage Recovery (Details) - USD ($) $ in Millions		1 Months Ended	4 Months Ended	12 Months Ended
	Nov. 18, 2021	May 31, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]
Net regulatory assets				$ 4,711	$ 5,493
Other regulatory assets				653	810
Other regulatory assets, deferred				5,577	7,198
Georgia Power
Public Utilities, General Disclosures [Line Items]
Approved decrease in annual billing based on fuel cost recovery rate		$ 740
Approved decrease in annual billing based on fuel cost recovery rate, term		2 years
Public utilities, approved rate increase (decrease), amount	$ 252		$ (44)
Approved rate increase, percent	15.00%
Adjustment to fuel cost recovery rate if under recovered fuel balance exceeds budget thereafter				200
Over (under) recovered fuel balance				$ (410)	113
Required period for options and hedges				36 months
Storm damage reserves				$ 213
Net regulatory assets				3,928	4,252
Other regulatory assets				241	248
Other regulatory assets, deferred				1,964	2,692
Georgia Power | Storm damage reserves
Public Utilities, General Disclosures [Line Items]
Net regulatory assets				48	262
Georgia Power | Storm/Property Damage Reserves
Public Utilities, General Disclosures [Line Items]
Other regulatory assets				$ 48	213
Other regulatory assets, deferred					$ 49