Regulatory Matters - GPC Nuclear Construction Cost and Schedule (Details) - GEORGIA POWER CO - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Loss Contingencies [Line Items]
Pre-tax charge to income	$ 16	$ 440	$ 455
Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Base project capital cost forecast	10,393		10,393
Construction contingency estimate	60		60
Total project capital cost forecast	10,453		10,453
Net investment as of end of the period	(8,966)		(8,966)
Remaining estimate to complete	1,487		1,487
Estimated cost to complete, costs not shared with other owners	590		590
Expected capitalized costs			385
Capitalized interest accrued	$ 247		$ 247
Plant Vogtle Units 3 And 4 | Twenty Fifth Vogtle Construction Monitoring Report
Loss Contingencies [Line Items]
Guarantor obligations				$ 1,700
Customer refund				$ 188