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Regulatory Matters - GPC Plant Vogtle Units 3 and Common Facilities Rate Proceeding (Details) - GEORGIA POWER CO - USD ($)
$ in Millions
Nov. 02, 2021
Oct. 12, 2021
Jun. 15, 2021
Subsequent Event      
Public Utilities, General Disclosures [Line Items]      
Requested rate increase (decrease) amount   $ 252  
Plant Vogtle Unit 3      
Public Utilities, General Disclosures [Line Items]      
Requested rate increase (decrease) amount     $ 2,380
Requested rate increase, annual amount     $ 302
Plant Vogtle Unit 3 | Subsequent Event      
Public Utilities, General Disclosures [Line Items]      
Approved rate increase (decrease) $ 2,100    
Approved depreciation expense deferred, annual amount $ 38