Regulatory Matters - GPC Amendments to the Vogtle Joint Ownership Agreements (Details) - GEORGIA POWER CO - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 11, 2018	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2022	Jul. 25, 2022	Jun. 18, 2022	Aug. 31, 2018
Public Utilities, General Disclosures [Line Items]
Pre-tax charge to income		$ 16,000	$ 440,000	$ 455,000
After tax charge to income		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		$ 10,453,000		10,453,000
Additional construction capital costs	$ 3,300,000			$ 480,000
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 | 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 | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Estimated cost to complete, starting dollar amount					$ 18,380,000
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