Regulatory Matters - GPC Amendments to the Vogtle Joint Ownership Agreements (Details) - GEORGIA POWER CO - USD ($) $ in Thousands				3 Months Ended			9 Months Ended
	Oct. 04, 2022	Sep. 29, 2022	Jan. 11, 2018	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2022	Jul. 25, 2022	Jun. 18, 2022	Aug. 31, 2018
Public Utilities, General Disclosures [Line Items]
Pre-tax charge to income				$ (102,000)	$ 16,000	$ 440,000	$ 353,000
After tax charge to income				(76,000)	$ 12,000	$ 328,000
Plant Vogtle Units 3 And 4
Public Utilities, General Disclosures [Line Items]
Production tax credits, aggregate purchase price, maximum							300,000
Preliminary estimated cost to complete				$ 10,383,000			$ 10,383,000
Additional construction capital costs			$ 3,300,000
Remaining share of construction costs, agreement to pay, percentage							100.00%
Percentage of ownership interest required for voting for continuing construction										90.00%
Percentage of costs, disallowed for recovery							6.00%
Costs disallowed for recovery, period							6 months
Public utilities, extension project schedule, term							1 year
Proportionate ownership share				45.70%			45.70%
Plant Vogtle Units 3 And 4 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs	$ 300,000
Plant Vogtle Units 3 And 4 | Vogtle Owners
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs							$ 100
Plant Vogtle Units 3 And 4 | Vogtle Owners | Tender Provision Dispute
Public Utilities, General Disclosures [Line Items]
Estimated cost to complete, starting dollar amount									$ 17,100,000
Plant Vogtle Units 3 And 4 | Vogtle Owners | Counterclaim Seeking Declaratory Judgement
Public Utilities, General Disclosures [Line Items]
Estimated cost to complete, starting dollar amount								$ 18,380,000
Plant Vogtle Units 3 And 4 | MEAG Power
Public Utilities, General Disclosures [Line Items]
Payment of power costs		$ 79,000
Plant Vogtle Units 3 And 4 | Minimum
Public Utilities, General Disclosures [Line Items]
Global amendments, tender provision, decision period after tender option triggered							120 days
Plant Vogtle Units 3 And 4 | Maximum
Public Utilities, General Disclosures [Line Items]
Global amendments, tender provision, decision period after tender option triggered							194 days
Plant Vogtle Units 3 And 4 | Category I
Public Utilities, General Disclosures [Line Items]
Preliminary estimated cost to complete				$ 8,400,000			$ 8,400,000
Additional construction capital costs, threshold							$ 800,000
Plant Vogtle Units 3 And 4 | Category II
Public Utilities, General Disclosures [Line Items]
Percentage of construction costs, responsibility to pay							55.70%
Additional construction capital costs							$ 80,000
Plant Vogtle Units 3 And 4 | Category II | Vogtle Owners
Public Utilities, General Disclosures [Line Items]
Percentage of construction costs, responsibility to pay							44.30%
Plant Vogtle Units 3 And 4 | Category II | Minimum
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs, threshold							$ 800,000
Plant Vogtle Units 3 And 4 | Category II | Maximum
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs, threshold							$ 1,600,000
Plant Vogtle Units 3 And 4 | Category III
Public Utilities, General Disclosures [Line Items]
Percentage of construction costs, responsibility to pay							65.70%
Additional construction capital costs							$ 100,000
Plant Vogtle Units 3 And 4 | Category III | Vogtle Owners
Public Utilities, General Disclosures [Line Items]
Percentage of construction costs, responsibility to pay							34.30%
Plant Vogtle Units 3 And 4 | Category III | Minimum
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs, threshold							$ 1,600,000
Plant Vogtle Units 3 And 4 | Category III | Maximum
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs, threshold							$ 2,100,000