Regulatory Matters - Georgia Power (Details) - GEORGIA POWER CO $ in Millions				6 Months Ended
	Jul. 29, 2019 MW	Jul. 16, 2019 MW	Jun. 28, 2019	Jun. 30, 2019 USD ($) MW	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Public Utilities, General Disclosures [Line Items]
Alternate Rate Plan period			3 years
Requested increases effective January 1, 2020				$ 563
Requested increases effective January 1, 2021				145
Requested increases effective January 1, 2022				234
Proposed retail ROE			10.90%
Proposed equity ratio			56.00%
Percentage of earnings above the top of allowed ROE range shared with customers			66.67%
Percentage of earnings above the top of allowed ROE range not shared with customers			33.33%
Cost recovery, new nuclear				99
Cost recovery, estimate, nuclear fuel				50
Under recovered CCR compliance cost				$ 135
Requested recovery of under recovered CCR compliance costs, period				3 years
Approved capacity of units for solar generation resources (mw) | MW				2,210
Approved capacity of units for investment portfolio (mw) | MW				80
Minimum
Public Utilities, General Disclosures [Line Items]
Allowed retail ROE			10.00%
Maximum
Public Utilities, General Disclosures [Line Items]
Allowed retail ROE			12.00%
Plant Hammond Units 1 Through 4
Public Utilities, General Disclosures [Line Items]
Net book value of planned units retirements				$ 500
Plant McIntosh Unit 1
Public Utilities, General Disclosures [Line Items]
Net book value of planned units retirements				40
Plant Mitchell Unit 3
Public Utilities, General Disclosures [Line Items]
Net book value of planned units retirements				$ 8
Subsequent Event
Public Utilities, General Disclosures [Line Items]
Rejected proposed capacity of units for certification | MW		25
Subsequent Event | Plant Hammond Units 1 Through 4
Public Utilities, General Disclosures [Line Items]
Capacity of units included in request for decertification of units (mw) | MW	840
Subsequent Event | Plant McIntosh Unit 1
Public Utilities, General Disclosures [Line Items]
Capacity of units included in request for decertification of units (mw) | MW	142.5
Remaining Net Book Value Of Retired Assets | Maximum
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period				3 years
Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Recovery of estimated under recovered CCR rule costs					$ 655	$ 395	$ 277