Regulatory Matters - GPC Nuclear Construction Cost and Schedule (Details) - GEORGIA POWER CO - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Pre-tax charge to income		$ 407
Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Base project capital cost forecast	$ 10,553
Construction contingency estimate	40
Total project capital cost forecast	10,593
Net investment as of end of the period	(9,747)
Remaining estimate to complete	846
Estimated cost to complete, costs not shared with other owners	610
Estimated cost to complete, construction monitoring costs approved for recovery	33
Expected capitalized costs	418
Capitalized interest accrued	334
Plant Vogtle Units 3 And 4 | Twenty Fifth Vogtle Construction Monitoring Report
Loss Contingencies [Line Items]
Guarantor obligations	1,700
Customer refund	$ 188