Regulatory Matters - GPC Plant Vogtle Units 3 and Common Facilities Rate Proceeding (Details) - GEORGIA POWER CO - Plant Vogtle Unit 3 - USD ($) $ in Millions	Jun. 15, 2021	Jun. 30, 2021
Public Utilities, General Disclosures [Line Items]
Requested revenues increase amount	$ 2,380
Requested rate increase, annual amount	370
Decrease in tariff	116
Fuel cost recovery balance		$ 45
Requested financing costs deferred, amount	$ 42