Regulatory Matters - GPC Nuclear Construction (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Loss Contingencies [Line Items]
Credit on plant vogtle units 3 and 4	$ 0		$ (160)	$ 21	$ (160)
GEORGIA POWER CO
Loss Contingencies [Line Items]
Credit on plant vogtle units 3 and 4	0	$ 21	(160)	21	(160)
After tax credit on plant vogtle units 3 and 4		$ 16	$ (120)	16	$ (120)
GEORGIA POWER CO | Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Estimated cost to complete, construction contingency estimate, financing costs	3,530			3,530
Costs recovered to date	$ 3,080			$ 3,080