REGULATORY MATTERS - GPC Rate Plans, Integrated Resource Plan and COVID-19 Costs (Details) $ in Millions									1 Months Ended				3 Months Ended			12 Months Ended									60 Months Ended	68 Months Ended
	Mar. 24, 2024 USD ($)	Jan. 12, 2024 turbine MW	Jan. 01, 2024 MW	Oct. 27, 2023 MW	Aug. 30, 2023 USD ($)	Aug. 01, 2023 USD ($)	May 16, 2023 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2022 USD ($)	Aug. 31, 2022 USD ($)	Jul. 31, 2022 agreement	Nov. 30, 2021 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2028 MW	Dec. 31, 2025 USD ($) MW	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2009 USD ($)	Dec. 31, 2028 MW	Dec. 31, 2028 MW	Oct. 06, 2023 pump	Mar. 31, 2023 USD ($)	Jan. 31, 2018 USD ($)	Dec. 31, 2016
Public Utilities, General Disclosures [Line Items]
Regulatory asset amortization period													4 years						4 years
Net regulatory assets									$ 5,833				$ 6,523		$ 5,833				$ 6,523	$ 5,833
Customer Refunds
Public Utilities, General Disclosures [Line Items]
Net regulatory assets									(183)				(19)		(183)				(19)	(183)
Georgia Power
Public Utilities, General Disclosures [Line Items]
Approved rate decrease								$ 10
Public utilities, approved rate increase (decrease), amount												$ 252
Requested rate increase (decrease), amount							$ 1,100
Net regulatory assets									4,663				$ 5,090		4,663				5,090	4,663
Requested number of power purchase agreements to be certified | agreement											6
Requested number of affiliate power purchase agreements to be certified | agreement											5
Requested rate increase (decrease), percentage							54.00%
Pre-tax charge to income														$ 160	407				$ 567
After tax charge to income														$ 120	304
Georgia Power | Plant Scherer (coal) Unit 3
Public Utilities, General Disclosures [Line Items]
Percent Ownership													75.00%						75.00%
Approved additional generating capacity (in MW) | MW				614
Georgia Power | Plant Gaston Units 1 through 4
Public Utilities, General Disclosures [Line Items]
Percent Ownership													50.00%						50.00%
Approved additional generating capacity (in MW) | MW				500
Georgia Power | ECCR
Public Utilities, General Disclosures [Line Items]
Regulatory asset amortization period													4 years						4 years
Approved rate decrease																			$ 20
Compliance costs expected to be incurred																			$ 300
Georgia Power | 2022 Alternate Rate Plan
Public Utilities, General Disclosures [Line Items]
Retail rate of return on common equity													10.50%						10.50%
Equity rate of return on common equity													56.00%						56.00%
Portion of actual earnings above approved ROE band applied to reduce regulatory assets																			40.00%
Portion of actual earnings above approved ROE band refunded to customers																			40.00%
Portion of actual earnings above approved ROE band retained by subsidiary company																			20.00%
Georgia Power | 2019 Alternate Rate Plan
Public Utilities, General Disclosures [Line Items]
Retail rate of return on common equity																							10.50%
Portion of actual earnings above approved ROE band applied to reduce regulatory assets																							40.00%
Portion of actual earnings above approved ROE band refunded to customers																						40.00%
Portion of actual earnings above approved ROE band retained by subsidiary company																						20.00%
Customer refund liability in absence of base rate case									5						5					5								$ 117
Georgia Power | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity (in MW) | MW																									750	230
Georgia Power | Scenario, Forecast | ECCR
Public Utilities, General Disclosures [Line Items]
Approved rate decrease																		$ 60
Compliance costs expected to be incurred																	$ 330	305
Georgia Power | Scenario, Forecast | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity (in MW) | MW			1,567													228	380
Georgia Power | Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Public utilities, approved rate increase (decrease), amount																					$ 2,100
Requested rate increase (decrease), amount																					3,600
Requested rate increase, annual amount						$ 318
Georgia Power | Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Retail rate of return on common equity																														10.95%
Public utilities, approved rate increase (decrease), amount					$ 5,462																2,100
Requested rate increase (decrease), amount					729
Decrease in tariff									(36)
Requested recovery of construction costs					7,562
Requested recovery of rate base items					1,020
Project capital cost forecast																													$ 7,300
Estimated in-service capital cost																								$ 4,418
Approved recovery of retail base rate																					362
Requested recovery of remaining retail rate base items					$ 656
Return on equity reduction, negative impact on earnings																			$ 310	300	$ 270
Requested rate increase (decrease), percentage					5.00%
Pre-tax charge to income													$ 228
After tax charge to income													$ 170
Percent Ownership													45.70%						45.70%
Georgia Power | Plant Vogtle Units 3 and 4 | Seventeenth Vogtle Construction Monitoring Report
Public Utilities, General Disclosures [Line Items]
Requested recovery of construction costs					$ 8,826
Requested recovery of rate base items					$ 1,070
Georgia Power | Plant Vogtle Units 3 and 4 | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Return on equity reduction, negative impact on earnings	$ 30																	$ 90
Georgia Power | Plant Yates | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Number of turbines | turbine		3
Approved additional generating capacity (in MW) | MW		442
Georgia Power | Plant Vogtle Unit 4
Public Utilities, General Disclosures [Line Items]
Number of RCP's | pump																											1
Georgia Power | Plant Bowen Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Approved additional generating capacity (in MW) | MW				1,400
Georgia Power | Plant Tugalo
Public Utilities, General Disclosures [Line Items]
Planned expenses to modernize plant										$ 115
Georgia Power | Customer Refunds
Public Utilities, General Disclosures [Line Items]
Net regulatory assets									(121)				$ (4)		(121)				$ (4)	(121)
Georgia Power | Customer Refunds | 2019 Alternate Rate Plan
Public Utilities, General Disclosures [Line Items]
Portion of actual earnings above approved ROE band refunded to customers, value									5						5					5								$ 117
Remaining Net Book Value of Retired Assets
Public Utilities, General Disclosures [Line Items]
Net regulatory assets									1,543				1,357		1,543				1,357	1,543
Remaining Net Book Value of Retired Assets | Georgia Power
Public Utilities, General Disclosures [Line Items]
Net regulatory assets									$ 962				841		$ 962				841	$ 962
Remaining Net Book Value of Retired Assets | Georgia Power | Plant Wansley Units 1 and 2
Public Utilities, General Disclosures [Line Items]
Net regulatory assets													$ 488						$ 488
Maximum | Georgia Power
Public Utilities, General Disclosures [Line Items]
Public utilities, approved rate increase (decrease), amount							$ 200
Requested additional generating capacity (in MW) | MW				1,000
Maximum | Georgia Power | 2022 Alternate Rate Plan
Public Utilities, General Disclosures [Line Items]
Retail rate of return on common equity													11.90%						11.90%
Maximum | Georgia Power | 2019 Alternate Rate Plan
Public Utilities, General Disclosures [Line Items]
Retail rate of return on common equity									12.00%						12.00%					12.00%	12.00%		12.00%
Maximum | Georgia Power | Plant Vogtle Units 3 and 4
Public Utilities, General Disclosures [Line Items]
Number of RCP's | pump																											7
Maximum | Georgia Power | Plant Yates
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity (in MW) | MW				1,400
Maximum | Georgia Power | Plant Vogtle Unit 4
Public Utilities, General Disclosures [Line Items]
Number of RCP's | pump																											4
Maximum | Remaining Net Book Value of Retired Assets | Georgia Power
Public Utilities, General Disclosures [Line Items]
Regulatory asset amortization period									3 years						3 years					3 years		4 years
Minimum | Georgia Power | 2022 Alternate Rate Plan
Public Utilities, General Disclosures [Line Items]
Retail rate of return on common equity													9.50%						9.50%
Minimum | Georgia Power | 2019 Alternate Rate Plan
Public Utilities, General Disclosures [Line Items]
Retail rate of return on common equity																							9.50%