REGULATORY MATTERS - GPC Schedule of Nuclear Construction Cost and Schedule (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Commitments [Line Items]
Total AFUDC and interest capitalized				$ 400	$ 327	$ 282
Georgia Power
Commitments [Line Items]
Pre-tax charge to income		$ 160	$ 407	567
Total AFUDC and interest capitalized				251	$ 213	$ 190
Georgia Power | Plant Vogtle Units 3 and 4
Commitments [Line Items]
Base project capital cost forecast	$ 10,717			10,717
Construction contingency estimate	36			36
Preliminary estimated cost to complete	10,753			10,753
Net investment	(10,564)			(10,564)
Remaining estimate to complete	189			189
Estimated cost to complete, costs not shared with other owners	610			610
Estimated cost to complete, construction monitoring costs approved for recovery	33			33
Pre-tax charge to income	228
Total AFUDC and interest capitalized				440
Total AFUDC and interest capitalized, accrual amount	$ 417			$ 417