Regulatory Matters - GPC Integrated Resource Plan (Details) - GEORGIA POWER CO $ in Millions					6 Months Ended	12 Months Ended
	Jan. 01, 2028 MW	Jan. 01, 2025 MW	Jan. 01, 2024 MW	Jul. 21, 2022 agreement ashPond MW	Jun. 30, 2022 USD ($) MW	Dec. 31, 2026 MW
Public Utilities, General Disclosures [Line Items]
Approved capacity increase (in MWs)					970
Subsequent Event
Public Utilities, General Disclosures [Line Items]
Approved change in closure method, number of ash ponds | ashPond				1
Number of approved Power Purchase Agreements | agreement				6
Number of approved Approved Power Purchase Agreements | agreement				5
Subsequent Event | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Approved capacity increase (in MWs)	228	380	1,567			265
Rejected additional generating capacity				88
Subsequent Event | Scenario, Forecast | Renewable Resources
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity				2,300
Subsequent Event | Scenario, Forecast | Energy Storage
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity				500
Subsequent Event | Scenario, Forecast | Biomass Generation
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity				140
Plant Wansley Units 1 and 2 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Capacity of units approved for decertification and retirement of units				926
Approved amounts for decertification and retirement of units, percentage				53.50%
Plant Wansley Unit 1
Public Utilities, General Disclosures [Line Items]
Remaining net book value | $					$ 302
Plant Wansley Unit 2
Public Utilities, General Disclosures [Line Items]
Remaining net book value | $					279
Plant Scherer Unit 3
Public Utilities, General Disclosures [Line Items]
Remaining net book value | $					$ 614
Plant Scherer Unit 3 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Capacity of units approved for decertification and retirement of units				614
Approved amounts for decertification and retirement of units, percentage				75.00%
Plant Gaston Units 1 through 4 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Capacity of units approved for decertification and retirement of units				500
Approved amounts for decertification and retirement of units, percentage				50.00%
Plant Bowen Units 1 and 2 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Capacity of units included in request for decertification of units				1,400