REGULATORY MATTERS - GPC Nuclear Construction (Details) - Georgia Power $ in Millions			3 Months Ended			12 Months Ended
	Oct. 17, 2023 USD ($)	Oct. 05, 2023 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2012 utility MW
Public Utilities, General Disclosures [Line Items]
Number of construction units approved | utility							2
Electric generating capacity (in MWs) | MW							1,100
Pre-tax charge to income				$ 160	$ 407	$ 567
After tax charge to income				$ 120	$ 304
Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Percent ownership			45.70%			45.70%
Estimated construction financing costs			$ 3,530			$ 3,530
Construction financing costs incurred to date			3,500			$ 3,500
Pre-tax charge to income			228
After tax charge to income			$ 170
Additional construction capital costs	$ 17	$ 308
Remaining share of construction costs, agreement to pay, percentage		66.00%				100.00%
Plant Vogtle Units 3 and 4 | Oglethorpe Power Corporation
Public Utilities, General Disclosures [Line Items]
Agreement with third party, expected cost		$ 105
Plant Vogtle Units 3 and 4 | Dalton Utilities
Public Utilities, General Disclosures [Line Items]
Agreement with third party, expected cost	$ 6
Plant Watson Unit 4
Public Utilities, General Disclosures [Line Items]
Additional base capital costs per month (up to)						$ 25