Regulatory Matters - GPC Nuclear Construction Cost and Schedule (Details) - GEORGIA POWER CO - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Sep. 30, 2022
Loss Contingencies [Line Items]
Pre-tax charge to income	$ (102)	$ 16	$ 440		$ 353
Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Base project capital cost forecast	10,334				10,334
Construction contingency estimate	49				49
Total project capital cost forecast	10,383				10,383
Net investment as of end of the period	(9,280)				(9,280)
Remaining estimate to complete	1,103				1,103
Estimated cost to complete, costs not shared with other owners	590				590
Expected capitalized costs					385
Capitalized interest accrued	$ 275				$ 275
Plant Vogtle Units 3 And 4 | Twenty Fifth Vogtle Construction Monitoring Report
Loss Contingencies [Line Items]
Guarantor obligations				$ 1,700
Customer refund				$ 188