REGULATORY MATTERS - Nuclear Construction (Details) - GEORGIA POWER CO $ in Millions							1 Months Ended			3 Months Ended	6 Months Ended	12 Months Ended
	Jan. 01, 2021	Aug. 18, 2020 USD ($)	Jul. 31, 2020 USD ($)	Jan. 01, 2020	Jan. 11, 2018 USD ($)	Jan. 01, 2016	Apr. 30, 2020	Dec. 31, 2019 USD ($)	Dec. 31, 2018 appeal	Jun. 30, 2020 USD ($) report	Jun. 30, 2020 USD ($) report	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2012 utility MW	Dec. 31, 2009 USD ($)	Aug. 31, 2018	Jun. 30, 2018 USD ($)	Dec. 31, 2013
Loss Contingencies [Line Items]
Additional construction capital costs					$ 3,300
Estimated in-service capital cost																	$ 4,418
Financing costs collected, net of tax											$ 2,400
Decrease in NCCR tariff								$ 62
Amendment to estimated in-service capital cost					$ 5,680
Retail rate of return on common equity																				10.95%
Number of appeals | appeal									2
Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Proportionate ownership share										45.70%	45.70%
Number of construction units approved | utility																2
Electric generating capacity in mega watts under consortium agreement | MW																1,100
Construction costs incurred											$ 2,400
Construction contingency estimate										$ 194	194								$ 366
Construction contingency estimate, amount in excess of original estimate										34	34
Construction contingency estimate, additional amount										115	115
Estimated loss on Plant Vogtle Units 3 and 4										149	149
Estimated loss on plants under construction, after tax										111	111
Expected percentage of positions eliminated							20.00%
Base project capital cost forecast, monthly											50
Monthly AFUDC											10
Percentage of ownership interest required for voting for continuing construction																		90.00%
Production tax credits, aggregate purchase price, maximum											300
Preliminary estimated cost to complete										8,500	$ 8,500
Remaining share of construction costs, agreement to pay, percentage											100.00%
Percentage of costs, disallowed for recovery											6.00%
Costs disallowed for recovery, period											6 months
Public utilities, extension project schedule, term											1 year
Cost settlement agreement revised forecast, net of payments										$ 7,300	$ 7,300
Public utilities, approved return on equity percentage				8.30%		10.00%
Public utilities, approved return on equity, monthly percentage decrease											0.10%
Return on equity reduction, negative impact on earnings															$ 75
Plant Vogtle Units 3 And 4 | Scenario, Forecast
Loss Contingencies [Line Items]
Construction costs incurred														$ 3,000
Public utilities, approved return on equity percentage	5.30%
Return on equity reduction, negative impact on earnings												$ 200	$ 255	$ 145
Plant Vogtle Units 3 And 4 | Vogtle Owners
Loss Contingencies [Line Items]
Period of notice required in the event letters of credit are not renewed											30 days
Twenty First Construction Monitoring Report | Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Number of approved construction management reports | report										21	21
Requested capital construction costs											$ 6,700
Guarantor obligations										$ 1,700	1,700
Customer refund											188
Twenty Second Construction Monitoring Report | Plant Vogtle Units 3 And 4 | Scenario, Forecast
Loss Contingencies [Line Items]
Requested capital construction costs		$ 674
Twenty Third Construction Monitoring Report | Plant Vogtle Units 3 And 4 | Scenario, Forecast
Loss Contingencies [Line Items]
Requested capital construction costs			$ 701
Minimum | COVID-19
Loss Contingencies [Line Items]
Estimate of possible loss										70	70
Maximum | COVID-19
Loss Contingencies [Line Items]
Estimate of possible loss										115	115
Category I | Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Preliminary estimated cost to complete										$ 8,400	8,400
Additional construction capital costs, threshold											$ 800
Category II | Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Percentage of construction costs, responsibility to pay											55.70%
Additional construction capital costs											$ 80
Category II | Plant Vogtle Units 3 And 4 | Vogtle Owners
Loss Contingencies [Line Items]
Percentage of construction costs, responsibility to pay											44.30%
Category II | Minimum | Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Additional construction capital costs, threshold											$ 800
Category II | Maximum | Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Additional construction capital costs, threshold											$ 1,600
Category III | Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Percentage of construction costs, responsibility to pay											65.70%
Additional construction capital costs											$ 100
Category III | Plant Vogtle Units 3 And 4 | Vogtle Owners
Loss Contingencies [Line Items]
Percentage of construction costs, responsibility to pay											34.30%
Category III | Maximum | Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Additional construction capital costs, threshold											$ 2,100