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Regulatory Matters - GPC Integrated Resource Plan (Details) $ in Millions					3 Months Ended	12 Months Ended
	Jun. 27, 2024 MW	Apr. 24, 2024 USD ($)	Apr. 16, 2024 MW	Jan. 12, 2024 turbine MW	Jun. 30, 2024 USD ($)	Dec. 31, 2028 MW	Dec. 31, 2025 MW	Mar. 07, 2024 USD ($)
GEORGIA POWER CO
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity (in MWs)	1,258
Number of turbines | turbine				3
GEORGIA POWER CO | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity (in MWs)						228	380
GEORGIA POWER CO | Maximum
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity (in MWs)			500
GEORGIA POWER CO | Plant Yates | Maximum
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity (in MWs)			1,400	442
GEORGIA POWER CO | Affiliate PPA
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity (in MWs)			750
GEORGIA POWER CO | Non-Affiliate PPA
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity (in MWs)			230
Southern Co and Georgia Power | Disposal Group, Held-for-sale, Not Discontinued Operations
Public Utilities, General Disclosures [Line Items]
Assets held for sale | $								$ 236
Proceeds from sale of transmission assets | $		$ 351
Gain (loss) on sale | $					$ 114
Gain (loss) on sale, after tax | $					$ 84

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