FINANCING - DOE Loan Guarantee Borrowings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Remaining borrowing capacity	$ 7,596,000,000
Line of credit facility, maximum borrowing capacity	7,655,000,000
Georgia Power
Debt Instrument [Line Items]
Percent of eligible project costs (may not exceed)				70.00%
Remaining borrowing capacity	1,726,000,000
Principal amortization payments	88,000,000	$ 96,000,000	$ 73,000,000
Line of credit facility, maximum borrowing capacity	$ 1,750,000,000
Basis spread on variable rate	0.375%
Amortization period	5 years
FFB Credit Facility | Georgia Power
Debt Instrument [Line Items]
Eligible project costs to be reimbursed				$ 5,130,000,000
Funds received under guarantee settlement agreement, less customer refunds				$ 1,492,000,000
Remaining borrowing capacity		0
Principal amortization payments	$ 88,000,000
Line of credit facility, maximum borrowing capacity	$ 4,900,000,000	$ 5,000,000,000
Plant Vogtle Units 3 and 4 | Georgia Power
Debt Instrument [Line Items]
Percent ownership	45.70%
Ownership interest percentage required for voting for continuing construction	90.00%