REGULATORY MATTERS - GPC Regulatory Matters (Details) - Georgia Power $ in Millions							6 Months Ended	12 Months Ended
	Nov. 18, 2021 USD ($)	Jan. 01, 2021	Jan. 01, 2020	Jan. 11, 2018 USD ($)	Jan. 01, 2018	Jan. 01, 2016	Jun. 30, 2021 USD ($) report	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2009 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2013
Public Utilities, General Disclosures [Line Items]
Retail rate of return on common equity												10.50%				10.95%
Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Estimated in-service capital cost														$ 4,418
Proceeds from recovery of financing costs										$ 2,700
Project capital cost forecast				$ 7,300
Requested decrease in NCCR tariff	$ 78
Additional construction capital costs										$ 460			$ 3,300
Payments for contractor settlement agreement				300
Amendment to estimated in-service capital cost				$ 5,680
Retail rate of return on common equity													10.95%
Authorized ROE		5.30%	8.30%		10.00%	10.00%
Potential decrease each month, percentage										0.10%
Return on equity reduction, negative impact on earnings										$ 270	$ 150	$ 75
Increase to base capital cost forecast not seeking recovery															$ 700
Plant Vogtle Units 3 and 4 | Twenty Fifth Vogtle Construction Monitoring Report
Public Utilities, General Disclosures [Line Items]
Number of approved construction monitoring reports | report							24
Approval of construction capital costs							$ 7,300
Maximum guarantee							1,700
Customer refund							$ 188
Plant Vogtle Units 3 and 4 | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Return on equity reduction, negative impact on earnings								$ 265	$ 300